Featured Events
Winter 2025-2026
Feb. 15, 2026
Feb. 2026
April 13, 2025
Dec. 2025
Jan. 2026
Winter 2025-2026
Feb. 15, 2026
Feb. 2026
April 13, 2025
Dec. 2025
Jan. 2026
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April 2025
5 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
5 Aspen Park Run, 5k, Gold & Tennis Club, Aspen, Colorado, 9:00 a.m., 970.429.2092
5 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
5 Widowmaker Trail Run, 7M/11M, Trailhead 3M up Little Park Road, Grand Junction, Colorado, 10:00 a.m., 970.241.6478
6 CO Brewery Running Series: Avery Spring 5k, Avery Brewing, Boulder, Colorado, 11:00 a.m., 303.955.7410
6 Donut Dash, 5k/10k, Washington Park, Denver, Colorado, 8:45 a.m., 720.985.9047
6 Elevate Kids Run, 2.5M/5k/10k, Las Colonias Park, Grand Junction, Colorado, 8:30 a.m., 303.555.4387
6 RMRR City Park 4 Miler, City Park, Denver, Colorado, 9:00 a.m., 303.871.8366
6 Rockin on the River 5k, Hudson Gardens Event Center, Littleton, Colorado, 9:00 a.m., 303.730.4610
11 Desert RATS Running Festival, 50k/Marathon, Hawkeye Trailhead, Fruita, Colorado, 6:30 a.m., 303.249.1112
12 Aspen Park Run, 5k, Gold & Tennis Club, Aspen, Colorado, 9:00 a.m., 970.429.2092
12 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
12 CMRA Clear Creek Run, 5k, Prospect Park, Golden, Colorado, 9:00 a.m., 720.308.4077
12 CO Brewery Running Series: Zuni Street Brew Run, 5k, Zuni Street Brewing, Denver, Colorado, 11:00 a.m., 303.955.7410
12 Fight for Air Climb, Coors Field, Denver, Colorado, 8:00 a.m., 303.388.8708
4/13/25 THREE CREEKS HALF
 13 Three Creeks Half Marathon, Cherry Creek State Park 303.642.7917
19 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
19 Great Western Trail Race, 5k/10k/Half, Severance Community Park, Windsor, Colorado, 8:00 a.m., 970.213.7258
19 Rattler Trail Races, 10k/25k/50k, Palmer Park, Colorado Springs, Colorado, 6:45 a.m., 719.429.9501
19 Rock Hawk Trail Races, 5k/10k/Half, Miller Activity Complex, Castle Rock, Colorado, 7:00 a.m., 303.320.3343
19 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
26 Runs with Scissors, Half Marathon/Marathon/50k, Adams County Regional Park, Brighton, Colorado, 7:00 a.m., 303.659.8792
26 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
26 A Hard Thing to Swallow Run, 2M/5k, Carpenter Park, Thornton, Colorado, 9:00 a.m., 239.931.7326
26 Adams 12 Five Start 5k for Wellness, Adams County Fairgrounds, Brighton, Colorado, 8:00 a.m., 970.867.5489
26 Cheyenne Mountain Ultra, 4M/7M/25k/50k, Cheyenne Mountain State Park, Colorado Springs, Colorado, 8:00 a.m., 719.963.1747
26 Loveland Classic Earth Day Races, 5k/10k, Davidson Gebhardt, Loveland, Colorado, 8:00 a.m., 970.613.5074
26 Royal Gorge Groove Trail Run, 5k/12k/20k/30k/50k, East Ridge Campground, Canon City, Colorado, 6:00 a.m., 602.346.0554
27 NOCO Half Marathon & 10K, Boyd Lake State Park, Loveland, Colorado, 7:15 a.m., 970.363.6499
27 CO Brewery Running Series: Left Hand Half, 5k/Half, Lefthand Brewing, Longmont, Colorado, 7:30 a.m., 303.955.7410
27 Flying Pig Charity Run, 5k, Spring Canyon Park, Fort Collins, Colorado, 9:00 a.m., 970.266.5409
27 Unicorn Run, 5k, Great Lawn Park, Denver, Colorado, 9:00 a.m., 720.722.4226
29 Dash & Dine 5k Race Series Dash & Dine, 5k, Boulder Reservoir, Boulder, Colorado, 6:30 p.m., Todd@BoulderRunning.com
May 2025
3 Adams County Foster Care 5k, 1M/5k, Riverdale Regional Park, Brighton, Colorado, 8:00 a.m., 303.637.8027
3 Hope House 5k, Apex Center, Arvada, Colorado, 9:00 a.m., 303.429.1012
3 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
3 Bob Turner Classic, 5k, Turner Middle School, Berthoud, Colorado, 8:00 a.m., 970.613.7400
3 Collegiate Peaks Trail Run, 25M/50M, Community Center, Buena Vista, Colorado, 6:30 a.m., 719.395.6612
3 Duck Waddle, 5k, Bond Park, Estes Park, Colorado, 9:00 a.m., 970.214.4128
3 Falcon 50, Half/Mar/50M, Stillman Field Air Force Academy, Colorado Springs, Colorado, 6:00 a.m., C23Rachelle.Allen@afacademy.af.edu
3 Fruita Girls on the Run, 5k, Shelledy Elementary School, Fruita, Colorado, 10:00 a.m., 970.257.9267
3 Furry Scurry, 2M, Washington Park, Denver, Colorado, 9:00 a.m., 303.751.5772
3 Greenland Trail Races, 4M/8M/25k/50k, Greenland Open Space, Larkspur, Colorado, 7:00 a.m., 720.985. 9047
3 Hayden Cog Run, 5k/8.4M, Hayden Town Park, Steamboat Springs, Colorado, 10:00 a.m., 970.879.0880
3 Run for the Trees, 2M, Centennial Park, Loveland, Colorado, 4:30 p.m., 970.215.9642
3 runBlossom 5k, Centennial Park, Canon City, Colorado, 10:00 a.m., 719.315.4114
3 Take 5 in the Garden of the Gods, 5k/5M, Garden of the Gods, Manitou Springs, Colorado, 8:00 a.m., 719.429.9501
4 CO Brewery Running Series: May the 4th Be With You, 5k, Frolic Brewing, Westminster, Colorado, 10:00 a.m., 303.955.7410
4 Colorado Marathon, 5k/10k/Half/Mar, South Edge Old Town Square, Fort Collins, Colorado, 6:30 a.m.
4 Emerge 5k, Boulder Reservoir, Boulder, Colorado, 8:00 a.m., 720.212.7527
4 Fairmont Firebird Chase, 1k/5k, Fairmount Park, Golden, Colorado, 9:00 a.m., 303.589.3429
4 Independence Day Races, 5k/Half, Sandstone Ranch Park South Pavilion, Longmont, Colorado, 6:00 a.m., 720.722.4226
4 RMRR Central Park Run, 5k/5M, Stapleton Central Park, Aurora, Colorado, 8:00 a.m., 303.871.8366
6 Dash & Dine 5k Race Series Dash & Dine, 5k, Boulder Reservoir, Boulder, Colorado, 6:30 p.m., Todd@BoulderRunning.com
14 Adventure Fest Half Marathon, Road 18 Trails, Fruita, Colorado, 7:15 a.m., 303.249.1112
10 Carbon Valley Half Marathon & 5k, Firestone Sports Complex, Firestone, Colorado, 8:00 a.m., 720.331.4678
10 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
10 Aspen Park Run, 5k, Gold & Tennis Club, Aspen, Colorado, 9:00 a.m., 970.429.2092
10 CMRA Tucker Lake Run, 8.5k, Tucker Lake, Arvada, Colorado, 7:30 a.m., 303.554.0870
10 CO Brewery Running Series: Firehouse 5k, Station 26 Brewing, Denver, Colorado, 10:00 a.m., 303.955.7410
10 Highline Canal Run, 5k/10k, deKoevend Park, Centennial, Colorado, 7:45 a.m., 303.483.7036
10 Hogback Hustle, 1M/5k, Bradford Elementary, New Castle, Colorado, 9:00 a.m., 724.656.4756
10 HRCA Mothers Day 5k, Mountain Vista High School, Highlands Ranch, Colorado, 9:00 a.m., 303.471.7048
10 Miles Over the Meadow Mothers Day Race, 5k, Tallman Meadow Park, Parker, Colorado, 8:00 a.m., 303.805.4500
10 Mothers Day 5k, Lesher Middle School, Fort Collins, Colorado, 9:00 a.m., 970.472.3800
10 Mountain Ridge Races, 5k/10k/Half/21M, Mountain Ridge Middle School, Highlands Ranch, Colorado, 7:00 a.m., 720.835.9141
10 Niwots Challenge, 25M, South Platte River, Sedalia, Colorado, 720624.9237
10 Quad Rock Trail Races, 25M/50M, Lory State Park, Fort Collins, Colorado, 5:30 a.m., 303.946.9320
10 Valkyrie Trail Race, 4M/Half/Mar/50k, Cheyenne Mountain State Park, Colorado Springs, Colorado, 7:00 a.m., 719.429.9501
11 Colorado Womens Classic Westminster, 5k/10k/10M, Westminster Promenade, Westminster, 8:30 a.m., 720.722.4226
11 Mothers Day 5k, City Park, Denver, Colorado, 9:30 a.m., 303.403.0978
13 Dash & Dine 5k Race Series Dash & Dine, 5k, Boulder Reservoir, Boulder, Colorado, 6:30 p.m., Todd@BoulderRunning.com
17 South Boulder Creek Park Run, 5k, East Boulder Community Recreation Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
17 Boneyard Boogie Trail Run, 6k/14k, Eagle Pool & Ice Rink, Eagle, Colorado, 9:00 a.m., 970.479.2280
17 CO Brewery Running Series, 5k, Stem Ciders at Acreage, Lafayette, 10:00 a.m., 303.955.7410
17 Endure 12 & 24 Hour, Mueller State Park, Divide, Colorado, 8:00 a.m., 720.624.9237
17 Memorial Day Run & March, 5k/10k/30k, Douglas County High School, Castle Rock, Colorado, 8:00 a.m., 719.388.9506
17 Ouray Backyard Ultra, 4M Loop/Last Person Standing, Fellin Park, Ouray, Colorado, 9:00 a.m.
17 Ram Party, 15k/24k/50k/60k/55M, Rampart Reservoir, Colorado Springs, Colorado, 6:00 a.m., 602.346.0554
17 Run to the Shrine, 4M, Cheyenne Mountain Zoo, Colorado Springs, Colorado, 2:00 p.m., 719.633.9925
17 Samsons Revenge, 10k/27k/55k, Bible Point, Estes Park, Colorado, events@runningwild.com
17 Spirit Challenge, 5k/10k, Middle School, Steamboat Springs, Colorado, 9:00 a.m., 970.879.0880
17 Vallecito Lake Heavy Half, Lake Vallecito, Bayfield, Colorado, 7:30 a.m., durangorunningclub@gmail.com
18 Colfax Marathon, 10M/Half/Mar, City Park, Denver, Colorado, 6:00 a.m., 303.694.2202
18 Miles for Smiles, 5k, North Area Athletic Complex, Arvada, Colorado, 9:00 a.m., 720.839.4626
20 Dash & Dine 5k Race Series Dash & Dine, 5k, Boulder Reservoir, Boulder, Colorado, 6:30 p.m., Todd@BoulderRunning.com
21 Summit Trail Running Series #1: Scrap Yard, 3.5M/5M, Tenderfoot Trailhead, Breckenridge, Colorado, 6:00 p.m., 970.453.1734
23 Weld Your Mettle Ultra, 7k/3, 6, 9, 12, 24 Hour, Private Land, Eaton, Colorado, 6:00 a.m., 970.213.7258
25 Buena Vista Spirit Trail Runs, 9k/Half/Mar, South Main/Town Square, Buena Vista, Colorado, 6:30 a.m., 719.395.9206
25 Narrow Gauge Runs, 5k/10M, Santa Rita Park, Durango, Colorado, 8:00 a.m., 206.856.1063
26 Bolder Boulder, 10k, 30th & Pearl, Boulder, Colorado, 7:00 a.m., 303.444.7223
31 Basalt Half Marathon & Relay, Base of Dam/Frying Pan Road, Basalt, Colorado, 7:45 a.m., 970.618.2063
31 Colorado Rockies Home Run for the Homeless, 5k, Coors Field, Denver, Colorado, 8:00 a.m., 303.312.2411
31 Fire Hydrant 5k, Spring Canyon Park, Fort Collins, Colorado, 8:30 a.m., 970.530.2947
31 North Fork Runs, 50k/50M, Buffalo Creek, Pine, Colorado, 7:00 a.m., 303.320.3343
31 Turquoise Lake Half Marathon, Matchless Boat Ramp, Leadville, Colorado, 9:00 a.m., 605.641.7580
June 2025
1 Steamboat Marathon, 10k/Half Marathon/Marathon, 8th & Oak, Steamboat Springs, Colorado, 7:30 a.m., 970.285.3550
1 Colorado 13er, 5k/10k/Half Marathon, Home Depot, Louisville, Colorado, 6:45 a.m., 720.722.4226
1 CO Brewery Running Series, 5k, Sanitas Brewing, Englewood, Colorado, 10:00 a.m., 303.955.7410
1 Colorado 13er, 5k/10k/Half, Home Depot, Louisville, Colorado, 6:45/7:30 a.m., 720.722.4226
1 Crazy Legs 10k, DevilÕs Backbone Open Space, Loveland, Colorado, 7:00 a.m., 219.873.6296
1 Fish Hatchery 5k, Cross Country Trail Run/National Fish Hatchery, Leadville, Colorado, 8:30 a.m., 605.641.7580
1 Steamboat Marathon, 10k/Half/Mar, 8th & Oak, Steamboat Springs, Colorado, 7:30 a.m., 970.285.3550
1 Stepping Stone 5k, Clements Park, Littleton, Colorado, 9:00 a.m., 720.839.4626
1 CO Brewery Running Series, 5k, Prost Brewing, Northglenn, Colorado, 10:00 a.m., 303.955.7410
4 Summit Trail Running Series #2 B&B Bolt, 3.4M/8.7M, B&B Trailhead, Breckenridge, Colorado, 6:00 p.m., 970.453.1734
5 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., Lance@WithoutLimits.com
5 Mountain Games Rocky Dog Trail Run, 5k, Nature Valley Mountain Plaza, Vail, Colorado, 6:00 p.m., 970.777.2015
7 Aidens Adventure Run, 5k, Fountain Creek Regional Park, Colorado Springs, Colorado, 10:00 a.m., 615.512.8128
7 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
7 Into the Wild Running Festival, 5k/10k, Wild Animal Sanctuary, Keenesburg, Colorado, 7:00 a.m., 303.536.0118
7 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
7 South Boulder Creek ParkRun, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., soutbouldercreek@parkrun.com
7 Steamworks Half Marathon, Sports Club, Durango, Colorado, 8:00 a.m., 970.903.6774
7 The Great Divide Ultra, 25k/50k/100k/100M, Mueller State Park, Colorado Springs, Colorado, 6:00 a.m., 719.690.1466
7 The Rosie Run, 5k, Cottonwood Creek Park, Colorado Springs, Colorado, 8:00 a.m., 719.306.2330
8 Colorado 13er, 5k/10k/Half Marathon, Home Depot, Louisville, Colorado, 6:45 a.m., 720.722.4226
8 CO Brewery Running Series, 5k/Half, Breckenridge Brewery, Littleton, Colorado, 10:00 a.m., 303.955.7410
8 Garden of the Gods 10, 10k/10M, Garden of the Gods, Manitou Springs, Colorado, 7:00 a.m., 719.963.1747
8 Terrex Trail Run at 9k Feet, 10k, Nature Valley Mountain Plaza, Vail, Colorado, 8:00 a.m., 970.777.2015
11 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., Lance@withoutlimits.com
13 HRCA Happy Hour Half K, 0.5k, Shea Stadium, Highlands Ranch, Colorado, 6:00 p.m., 303.471.7048
14 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
14 Barr Lake Races, 5k/15k/Half/Mar/30k/50k, Barr Lake State Park, Brighton, Colorado, 7:30 a.m., 858.259.1501
14 Climb 4 Change, 200 steps, Philip S Miller Park/Challenge Hill, Castle Rock, Colorado, 10:15 a.m., 303.814.7455
14 CMRA XC Challenge, 6k, John Meade Park, Cherry Hills, Colorado, 8:00 .am., 720.480.2370
14 Dash Across the Dam FatherÕs Day Race, 5k, Rueter Hess Reservoir, Parker, Colorado, 8:00 a.m., 303.805.4500
14 JodiÕs Race for Awareness, 5k, City Park, Denver, Colorado, 8:00 a.m., 303.694.2202
14 Longs Peak 5 Miler, 5M, High School, Estes Park, Colorado, 8:00 a.m., 303.555.4387
14 SamÕs Rainbow Run, 5k, CSU Oval, Fort Collins, Colorado, 8:00 a.m., 970.556.3279
14 Sierras Race Against Meningitis, 5k, Foundations Church, Loveland, Colorado, 8:00 a.m., 970.310.9103
14 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
14 Summits Trail Runs, 6M/21M/27M/43M, Granby Ranch Resort, Granby, Colorado, 6:00 a.m., 720.624.9237
15 Arvada FatherÕs Day Classic, 5k/10k, Apex Center, Arvada, Colorado, 8:00 a.m., 720.722.4226
15 Estes Park Races, Kids/5M/Half/Mar, Middle & High Schools, Estes Park, Colorado, 6:00 a.m., 970.214.4128
17 Mountain Goats Kids Trail Running Series, 0.5M/1.6M/5k, Frisco Nordic Center, Frisco, Colorado, 5:45 p.m., 970.668.9133
18 Summit Trail Running Series #3, 4.2M/8.8M, Blair Witch Trailhead, Breckenridge, Colorado, 6:00 p.m., 970.453.1734
19 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., Lance@withoutlimits.com
21 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
21 Howelson 8 Miler, 4M/8M, Olympian Hall, Steamboat Springs, Colorado, 8:00 a.m., 970.879.0880
21 Red, White and Brew Race, 5k/10k, Raindance National Golf Course, Windsor, Colorado, 7:00 a.m., 970.213.7528
21 Ring the Springs, 25k/50k/100k, America the Beautiful Park, Colorado Springs, Colorado, 6:00 a.m., 602.346.0553
21 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., soutbouldercreek@parkrun.com
21 Summer Solstice, 5k/10k/Kids, Creekside Park, Beaver Creek, Colorado, 9:30 a.m., 970.479.2280
21 Tails on the Trail Run, 5k, Loyal Dukes Dog Park, Salida, Colorado, 9:00 a.m., 719.395.2737
22 Healing Warriors Run, 5k, Spring Canyon Park, Fort Collins, Colorado, 10:00 a.m., 970.776.8387
25 Summer Scamper, 5k, Bible Park, Denver, Colorado, 6:30 p.m., 303.555.4387
26 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., lance@withoutlimits.com
28 Slacker Half Marathon - Relay - 4 Mile Races Georgetown, CO 80444 | Colorado Marathon> Slacker Races, 4M/Half Marathon/Relay, Loveland Ski Area, Georgetown, Colorado, 8:00 a.m., 303.679.2312
28 Timberview Trail Run, 2.5M/5M, Lory State Park, Bellvue, Colorado, 7:30 a.m., 970.363.6499
28 Aspen Park Run, 5k, Aspen Gulf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
28 CO Brewery Running Series, 5k/Half, Milieu Fermentation Brewery, Aurora, Colorado, 10:00 a.m., 303.955.7410
28 Jeremy Bitner Fallen Officer Run, 5k/10k, Cornerstone Park, Englewood, Colorado, 8:00 a.m., 720.281.5938
28 Leadville Trail Marathon & Heavy Half Marathon, 6th Street Gym, Leadville, Colorado, 8:00 a.m., 719.219.9351
28 Pearl Street Mile, Court House, Boulder, Colorado, 5:00 p.m., 720.532.5549
29 Turkey Flats Trail Run, 9.6M, Glade Park, Grand Junction, Colorado, 9:00 a.m., 970.434.9753
July 2025
1 Mountain Goats Kids Trail Running Series, 0.5M/1.5M/3.2M, Frisco Nordic Center, Frisco, Colorado, 5:45 p.m., 970.668.9133
4 Parker Hometown 4th of July 5K Parker 4th of July 5k, Legend High School, Parker, Colorado, 8:15 a.m.720.722.2150
4 Niwot 4th of July Mile, Market to High School, Niwot, Colorado, 8:00 a.m.
4 Boulder 4 on the Fourth, Avery Brewing, Boulder, Colorado, 9:00 a.m., 303.440.4324
4 Breckenridge Independence Day Trail Run, 10k, Carter Park, Breckenridge, Colorado, 7:00 a.m., 970.453.1734
4 Castle Rock-It Run, 5k/Half Marathon, Douglas County Fairgrounds, Castle Rock, Colorado, 8:00 a.m., 303.229.1798
4 Evergreen Freedom Run, 5k, Evergreen Middle School, Evergreen, Colorado, 8:00 a.m., 720.33.8063
4 Fort Collins FireKracker 5k, City Park, Fort Collins, Colorado, 7:30 a.m., 970.556.3279
4 Greeley Freedom Run, 5k, Downtown Greeley, Colorado, 7:00 a.m., 970.213.7258
4 HRCA Independence Day 5k, Dorchester Street/Town Center South, Highlands Ranch, Colorado, 8:00 a.m., 303.471.7048
4 Louisville Let Freedom Run, 5k/10k/Kids, Streets Fitness, Louisville, Colorado, 8:00 a.m., 720.722.4226
4 Loveland Liberty 5k, Loveland Fairgrounds Park, Loveland, Colorado, 8:00 a.m., 970.215.9642
5 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
5 Hahns Peak Hill Climb, 8M, The Cabins at Historic Columbine General Store, Steamboat Springs, Colorado, 9:30 a.m., 303.915.0396
5 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
5 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
5 Vail HillClimb, 7.5M, Vail Mountain Haus, Vail, Colorado, 8:00 a.m., 970.479.2280
5 CO Brewery Running Series, 5k, Odell Brewing Company, Fort Collins, Colorado, 10:00 a.m., 303.955.7410
6 CO Brewery Running Series, 5k/Half Marathon, New Image Brewing, Wheat Ridge, Colorado, 10:00 a.m., 303.955.7410
10 Boulder Stroke & Stride, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., lance@withoutlimits.com
11 Hardrock Hundred Mile Endurance Run, Silverton, Colorado, 970.259.3693
11 Silverheels Endurance Run, 50M/100k/100M, Como Roundhouse, Como, Colorado, 9:00 p.m., 720.624.9237
12 Chase the Moon 12 Hour Endurance Run, Mountain Vista High School, Highlands Ranch, Colorado, 7:00 p.m., 303.320.3343
12 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
12 Cookie Chase, 5k/10k, Washington Park, Denver, Colorado, 9:00 a.m., 720.985.9047
12 Elk Meadow 5 Mile Run, Lewis Ridge Trail Head, Evergreen, Colorado, 8:00 a.m., 303.912.6401
12 Evergreen Mountain Trail Run, 10k, Alderfer Three Sisters Park, Evergreen, Colorado, 8:00 a.m., 720.880.1226
12 Silver Rush 50 Mile Run, Dutch Henry Hill, Leadville, Colorado, 9:00 a.m., 719.219.9351
12 Silverheels Endurance Run, 10M/19M/60k, Como Roundhouse, Como, Colorado, 6:00 a.m., 720.624.9237
12 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
13 Craig Crest Trail Run, 10.5M, Island Lake Trailhead, Grand Mesa, Colorado, 9:00 a.m., 970.434.9753
15 Mountain Goats Kids Trail Running Series, 0.5M/1.6M/5k, Frisco Nordic Center, Frisco, Colorado, 5:45 p.m., 970.668.9133
16 Summit Trail Running Series #4, 3.7M/7.4M, TomÕs Baby Trailhead, Breckenridge, Colorado, 6:00 p.m., 970.453.1734
17 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., lance@withoutlimits.com
18 Ouray Endurance Run, 100M, Fellin Park, Ouray, Colorado, midnight, info@ouray100.com
19 10k at 10000 Feet, 5k/10k, Eagle Bahn Gondola @ Eagles Nest, Vail, Colorado, 9:00 a.m., 970.479.2280
19 5k Run for Kids in Sports, Kent Denver, Cherry Hills, Colorado, recruitingclassroom@gmail.com
19 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
19 CO Brewery Running Series, 5k/10k, Weldwerks Brewing Company, Greeley, Colorado, 10:00 a.m., 303.955.7410
19 Silverton Alpine Races, 8M/Marathon/50k, Alpine Loop, Silverton, Colorado, 7:00 a.m., 602.346-0554
19 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
19 Summer Splash Prairie Dog Races, 5k/10k/Half Marathon, Castle View High School, Castle Rock, Colorado, 6:30 a.m., 720.722.4226
20 Floyd Hill Dash, 5k, Idaho Springs, Colorado, 9:00 a.m., 303.522.4387
20 Kendall Mountain Sky Race, 11k/12M, 12th & Greene to Memorial Park, Silverton, Colorado, 9:00 a.m., 602.828.6629
24 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., lance@withoutlimits.com
25 Never Summer Trail Race, 100k, Gould Community Center, Walden, Colorado, 5:30 a.m., 303.946.9320
26 Elevation Run, 2M/5k/10k, West Jeff Elementary School, Conifer, Colorado, 8:00 a.m., 303.982.5255
26 Enchanted Forest Trail Races, Half Marathon/Marathon, Bradenburg Park, Red River, New Mexico, 6:30 a.m., 303.249.1112
26 Aspen Park Run, 5k, Aspen Gold Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
26 CO Brewery Series, 5k/10k, Rocky Mountain Tap House, Louisville, Colorado, 10:00 a.m., 303.955.7410
26 Pikes Peak Ultra, 20k/30k/50k/50M, Bear Creek Regional Park, Colorado Springs, Colorado, 5:30 a.m., 719.429.9501
26 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
27 Dash for Smiles, 5k, Stapleton Central Park, Denver, Colorado, 8:30 a.m., 720.343.6201
27 Mountain Goats Kids Trail Running Series, 0.5M/1.5M/5k, Frisco Day Lodge, Frisco, Colorado, 5:45 p.m., 970.668.9133
30 Summit Trail Running Series #5, 3.3M/5.1M, Carter Park & Pavillion, Breckenridge, Colorado, 6:00 p.m., 970.453.1734
August 2025
1 RMRR DeKoevend Park Run, 5k, DeKoevend Park, Englewood, Colorado, 6:30 p.m., 303.871.8366
1 Wild West Relay, 200M, Budweiser Tour Center, Fort Collins, Colorado, 5:00 a.m., 970.213.7258
2 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
2 Berry Picker Trail Run, 5k, Lionshead Village, Vail, Colorado, 8:00 a.m., 970.479.2289
2 Emerald Mountain Epic, Half Marathon/Marathon, Howelsen Base Area, Steamboat Springs, Colorado, info@emeraldmtnepic.org
2 Kennebec Challenge Mountain Run, 8.5M/15M, La Plata Canyon/La Plata City Campground, La Plata, Colorado, 8:00 a.m., 970.247.0313
2 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
2 Sheep Mountain Endurance Run, 50k/50M, Town Beach, Fairplay, Colorado, 6:00 a.m., 720.624.9237
2 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
2 Valley 5000 Run, 5k, Mehaffey Park, Loveland, Colorado, 7:00 p.m., 970.215.9642
4 Trans Rockies Run, 113M, Buena Vista to Beaver Creek, Colorado, 8:30 a.m., 403.668.7537
5 Lory Summer Trail Series #1, Valley 5k, Lory State Park, Bellevue, Colorado, 6:00 p.m., 303.946.9320
7 Boulder Stroke & Stride Run, 5k, Boulder Reservoir, Boulder, Colorado, 6:05 p.m., lance@withoutlimits.com
8 CO Brewery Running Series, 2k/5k/10k/17k, New Belgium Ranger Station, Snowmass, Colorado, 7:30 a.m., 303.955.7410
8 Mountain Avenue Mile, Howes St & Washington Park, Fort Collins, Colorado, 6:30 p.m., 970.221.1099
9 Sunrise Stampede, 2M/10k, 11th Avenue, Longmont, Colorado, 8:30 a.m., 720.652.8208
9 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
9 Georgetown to Idaho Springs Half Marathon, Georgetown Lake, Georgetown, Colorado, 8:00 a.m., 303.378.2404
9 Holy COW Trail Stampede, 5k/10k, Promenade Terrace SE Side, Westminster, Colorado, 7:30 a.m., 720.722.4226
9 Human Race, 5k/10k/Half Marathon, Museum of Discovery & Civic Center Park, Fort Collins, Colorado, 6:30 a.m., 970.556.3279
9 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
9 Severance Days 5k, Severance Community Park, Windsor, Colorado, 8:00 a.m., 970.213.7258
10 Leadville Trail 10k, 6th & Harrison, Leadville, Colorado, 9:00 a.m., 719.219.9351
10 Pancake Stampede, 5k, Hudson Gardens, Littleton, Colorado, 8:00 a.m., 303.798.7515
12 Lory Summer Trail Series #2, Hilly 10k, Lory State Park, Bellevue, 6:00 p.m., 303.946.9320
16 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
16 Cheyenne Mountain run, 5k/10k/25k, Cheyenne Mountain State Park, Colorado Springs, Colorado, 9:00 a.m., 719.322.0574
16 Leadville Trail 100, 6th & Harrison, Leadville, Colorado, 3:00 a.m., 719.219.9351
16 Mt Sneffels Marathon & Half Marathon, Ouray Hot Springs Park, Ouray, Colorado, 6:30 a.m., 970.325.0228
16 South Boulder Creek Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
17 Erie Half Marathon, Reliance Park, Erie, Colorado, 8:30 a.m., 720.722.4226
19 Lory Summer Trail Series #3, Hilly 5k, Lory State Park, Bellevue, Colorado, 6:00 p.m., 303.946.9320
22 NOCO Urban Ultra, 50M/100M/Solo/Relay, Poudre River Trail/Island Grove, Greeley, Colorado, 8:00 a.m., 970.213.7258
22 Arrowhead Half Marathon & 5k, Arrow Bahn Lift, Arrowhead, Colorado, 8:00 a.m., 970.479.2280
23 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
23 CO Brewery Running Series, 5k, Resolute Tap & Cellar, Arvada, Colorado, 10:00 a.m., 303.955.7410
23 Continental Divide Trail Run, 5M/16M/50k, Knoll Parking Lot (shuttles to Fish Creek start line), Steamboat Springs, Colorado, 8:00 a.m., 970.879.0880
23 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
23 Staunton State Park Run, 20k, Staunton State Park, Evergreen, Colorado, 8:00 a.m., 720.880.1000
23 Telluride Mountain Run, 14M/22M/38M, Base of Gondola, Telluride, Colorado, 301.491.4412
23 Thirsty 13 Half Marathon, Ska Brewing, Durango, Colorado, 7:00 a.m., 970.903.6774
23 Westminster Trail Races, 5k/10k/Half Marathon/Marathon/35k/50k, Wayne Carle Middle School, Westminster, Colorado, 7:00 a.m., 858.775.7104
24 Bluffs Run, 5k, Lone Tree Recreation Center, Lone Tree, Colorado, 8:00 a.m., 303.483.7034
26 Lory Summer Trail Series #4, Valley 12k, Lory State Park, Bellevue, Colorado, 6:00 p.m., 303.946.9320
27 Northridge Elementary Fun Run, Northridge Elementary School, Highlands Ranch, Colorado, 10:30 a.m., 303.555.4387
29 Creede Mountain Run, 2M/12M/22M/50k, Loma Avenue, Creede, Colorado, 8:00 a.m., 719.658.2374
30 Grand Traverse Mountain Run, 40M, Elk Avenue, Crested Butte to Aspen, Colorado, 6:30 a.m., 970.497.9600
30 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
31 Broncos Fit 7k, Broncos Stadium, Denver, Colorado, 9:00 a.m., 720.258.3100
September 2025
1 Labor Day Races, 5k/10k/Half Marathon, Salisbury Park, Parker, Colorado, 7:00 a.m., 720.985.9047
1 Oak Creek No Fun Run, 5k, Town Hall, Oak Creek, Colorado, 10:00 a.m., 970.260.6257
5 Flaming Foliage Relay, 165M, Citizens Park, Idaho Springs to Buena Vista, Colorado, 5:00 a.m., 970.213.7258
6 Aspen Park Run, 5k Aspen Golf Course, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
6 Black Squirrel Half Marathon, Lory State Park, Bellevue, Colorado, 7:00 a.m., 303.946.9320
6 CASA Superhero Run, 5k, Two Rivers Park, Glenwood Springs, Colorado, 9:30 a.m., 303.522.4387
6 Cirque Trail Series, 6.8M/2340 Vertical Feet, Arapahoe Basin Mountain Goat Plaza, Keystone, Colorado, 10:00 a.m., 800.516.0041
6 HRCA Wildcat Mountain Trail Race, 10k/10M, Rocky Heights Middle School, Highlands Ranch, Colorado, 7:00 a.m., 303.471.7048
6 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
6 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
7 Flyin Lion, 5k, High School, Littleton, Colorado, 9:00 a.m., sydney@rightstartevents.com
7 RMRR Platte River Run, 5k/10k, Riverwalk Ballfields, Thornton, Colorado, 8:00 a.m., 303.871.8366
12 Run Rabbit Run, 50M/100M/Solo/Relay, Ski area, Steamboat Springs, Colorado, 8:00 a.m., 970.879.0880
13 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
13 CMRA The South Seven, 7M, Bluffs Regional Park, Lone Tree, Colorado, 7:30 a.m., 303.912.6401
13 CO Brewery Running Series, 5k, Waldschanke Ciders Brewing, Denver, Colorado, 10:00 a.m., 303.955.7410
13 Meadowgold Trail Races, 5k/11k, Meadow Mountain, Minturn, Colorado, 8:00 a.m., 970.479.2280
13 Ned Ned Run, 5k/Half Marathon, Teens, Inc, Nederland, Colorado, 8:00 a.m., 303.258.3821
13 Oktoberfest 5k, Gold Rush Lot, Breckenridge, Colorado, 7:00 a.m., 970.453.1734
13 Ouray Endurance Run, 50M, Fellin Park, Ouray, midnight, info@ouray100.com
13 Snow Mountain Ranch Trail Running Festival, 5k/10k/Half Marathon/Marathon, 33k/50k, YMCA of the Rockies Nordic Center, Granby, Colorado, 8:00 a.m., 858.775.7104
13 So Long to Summer, 5k/10k, Salisbury Park, Parker, Colorado, 8:00 a.m., 303.841.0353
13 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
13Team Hope 5k, Stapleton Central Park, Denver, Colorado, 9:00 a.m., 303.522.4387
14 CO Brewery Running Series, 5k, Cabin Creek Brewing, Georgetown, Colorado, 10:00 a.m., 303.955.7410
14 Equinox Half Marathon & 5 Mile, Poudre Canyon, Fort Collins, Colorado, 8:00 a.m., 970.556.3279
14Lead King Loop & Quarry Climb, 25k, Thompson Park, Marble, Colorado, 8:30 a.m., 970.704.1275
14 Nun Run Races, 1M/5k/Half Marathon, DeKoevend Park, Centennial, Colorado, 7:00 a.m., 720.722.3485
19 Spring Creek Memorial, 5k/9M, Spring Creek Trail, Steamboat Springs, Colorado, 8:00 a.m., 970.879.0880
20 Beulah Challenge and OverIt Series The Beulah Challenge, 5k/10k/Half Marathon, Beulah School of Natural Sciences, Beulah, Colorado, 8:00 a.m.
20 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
20 Autumn Color Run, 1M/5k/10k/Half Marathon, McPhelemy Park, Buena Vista, Colorado, 9:00 a.m., 719.221.2867
20 Pikes Peak Ascent, Half Marathon, Middle/High Schools, Manitou Springs, Colorado, 7:00 a.m., 719.473.2625
20 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
21 Farmers 5000, 5k, Wheat Ridge High School, Wheat Ridge, Colorado, 9:00 a.m., 303.880.1732
21 Estes Trail Ascent, 5.9M, Ravencrest Chalet & Conference Center, Estes Park, Colorado, 10:00 a.m., 719.214.4128
21 Pikes Peak Marathon, Middle/High Schools, Manitou Springs, Colorado, 7:00 a.m., 718.473.2625
21 Second Wind Run, 5k, Clement Park, Littleton, Colorado, 303.522.4387
26 Red Feather Jamboree, Half Marathon/50k, Ben Dalatour Scout Ranch, Red Feather Lakes, Colorado, 6:00 p.m., 303.946.9320
27 Monument Marathon Most Beautiful Race in Nebraska> Monument Marathon, 5k/Half Marathon, Marathon, Five Rocks Amphitheatre, Gering, Nebraska, 8:00 a.m., 308.765.0524
27 24 Hours of Palmer Lake, Santa Fe Regional Trail, Monument, Colorado, 8:00 a.m., 859.327.2423
27 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
27 CO Brewery Running Series, 5k, Prost Brewing, Northglenn, Colorado, 10:00 a.m., 303.955.7410
27 Cougar Ridge Classic, 26k, Vail to Minturn, Colorado, 7:00 a.m., 970.479.2280
27 Crested Butte Ultra, 35k/55k/50M, Crested Butte Mountain Resort, Crested Butte, Colorado, 4:00 a.m., 719.429.9501
27 Deep Creek Half Marathon, Regional Airport, Telluride, Colorado, 12:00 p.m., 970.708.7736
27 Emerald Mountain Trail Run, 12k, Howelsen Hill, Steamboat Springs, Colorado, 9:00 a.m., 970.879.0880
27 HRCA Oktoberfest, 5k/100Y Dash, Town Center, Highlands Ranch, Colorado, 8:30 a.m., 303.471.7048
27 Pioneer Prairie Dog Races, 5k/10k/Half Marathon, Westminster Promenade, Westminster, Colorado, 8:00 a.m., 720.722.4226
27 Run 4 Hope, 5k, The Ascent Church, Monument, Colorado, 8:05 a.m., 719.930.6140
27 Run Run, 5k, Bond Park, Estes Park, Colorado, 8:30 a.m., 970.214.4128
27 Sangre de Cristo Ultra, 50M/100k/100M, Greenhorn/Music Meadows Ranch, Westcliffe, Colorado, 4:00 a.m., 720.624.9237
27 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 8:00 a.m., southbouldercreek@parkrun.com
27 West Line Winder Trail Run, 50k, East Main & North Court Streets, Buena Vista, Colorado, 8:00 a.m., 720.591.6634
27 Wild Wahatoya Runs, 8M/Half Marathon/50k, Le Veta, Colorado, 6:00 a.m., info@TrailTrashAdventures.com
28 Graland Gallop, 5k, Washington Park, Denver, Colorado, 9:00 a.m., 303.399.8370
28 Heart to Heart 5k, Spruce Street to Pearl Street Mall, Boulder, Colorado, 7:15 a.m., support@boulderthon.org
28 Sangre de Cristo Ultra Day #2, 8M/27k, Greenhorn/Music Meadows Ranch, Westcliffe, Colorado, 4:00 a.m., 720.624.9237
October 2025
4 Rim to Rim Royal Gorge RacesRim to Rim Royal Gorge Races, 5k/8M/Half Marathon, Royal Gorge, Canon City, Colorado, 8:30 a.m., 719.661.7600
4 Above the Clouds Ultra, 10k/50k, Woodland Middle School, Woodland Park, Colorado, 7:00 a.m., 719.5904
4 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
4 Bear Chase Races, 5k/10k/Half Marathon/50k/50M, Bear Creek Lake Park, Lakewood, Colorado, 6:30 a.m., 303.320.3343
4 Colorado Springs Races, 5k/Half Marathon/Marathon, Acacia Park, Colorado Springs, Colorado, 7:00 a.m., 801.455.9623
4 Hanging Flume 50k, Uravan Ballpark, Naturita, Colorado, 8:00 a.m., 970.708.7736
4 I Can 5k/DŽjˆ vu Run, 5k/10k, Riverdale Regional Park Pavilion B, Brighton, Colorado, 7:00 a.m., 720.722.4226
4 Nielson Challenge, 2M, North Monument Valley Park, Colorado Springs, Colorado, 8:00 a.m., 719.534.0534
4 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
5 CO School of Mines Homecoming 5k, Mines Admin Building, Golden, Colorado, 8:00 a.m., 303.273.3275
5 CO Brewery Running Series, 5k/Half Marathon, New Belgium Brewing, Fort Collins, Colorado, 10:00 a.m., 303.955.7410
5 PPRC Fall XC Series #1, 3.8M, Bear Creek Terrace, Colorado Springs, Colorado, 10:00 a.m., 719.648.9996
5 Strides for Sierra, 5k, Sierra Elementary School, Arvada, Colorado, 9:00 a.m., 303.522.4387
5 Windsor Marathon, 5k/10k/Half Marathon/Marathon, The Island at Pelican Lakes, Windsor, Colorado, 7:00 a.m., 970.213.7258
11 Wiggins High School Cross Country Invitational, 5k, High School, Wiggins, Colorado, 8:30 a.m., 970.596.2607
11 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
11 CMRA Triple Cross Trail Run, 8.6M, Stone House Park, Lakewood, Colorado, 9:00 a.m., 303.765.5512
11 Long View Races, Half Marathon/Marathon, City Park & Fossil Creek Park to Foote Lagoon Amphitheatre, Fort Collins to Loveland, Colorado, 8:00 a.m., 970.215.9642
11 Sage Burner Trail Race, 15k/28k/50k, Hartman Rock, Gunnison, Colorado, 7:00 a.m., 719.429.9501
11 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
12 Run the Rocks, 5k, Red Rocks Amphitheater, Morrison, Colorado, 9:00 a.m., 303.522.4387
18 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
18 Blue Sky Trail Marathon, Blue Sky Trailhead/Horsetooth Mountain Park, Fort Collins, Colorado, 7:00 a.m., 303.946.9320
18 Bobcat Trail Races, 5k/10k/25k/50k, Palmer Park, Colorado Springs, Colorado, 7:00 a.m., 719.429.9501
18 CSU Homecoming 5k, CSU Oval, Fort Collins, Colorado, 8:00 a.m., 970.556.3279
18 Great Trailhead Foot Race, 5M/10M, Bear Creek Lake Park/Pelican Point, Morrison, Colorado, 8:00 a.m., 720.722.4226
18 Indian Creek Fifties, 5M/15M/55k/50M, Indian Creek Trailhead, Sedalia, Colorado, 6:00 a.m., 720.624.9237
18 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
19 CO Brewery Runs, 5k, Avery Brewing, Boulder, Colorado, 9:00 a.m., 720.532.5549
19 PPRC Fall XC Series #2, 4M, North Monument Valley Park, Colorado Springs, Colorado, 10:00 a.m., 719.648.9996
25 Eerie Erie, 5k/10k, Middle School, Erie, Colorado, 9:30 a.m., 303.926.7293
25 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
25 Beware of the Bear Trail Run, 5k/15k, Bear Creek Lake Park, Morrison, Colorado, 10:00 a.m., 303.870.0487
25 Bridge Burner Ultra, 10k/35k/50k/35M, Centennial Park, Canon City, Colorado, 7:30 a.m., 719.590.1466
25 CO Brewery Running Series/Boos & Brews, 5k, Number 38, Denver, Colorado, 10:00 a.m., 303.955.7410
25 Foundry Halloween Run, 5k, Soda Creek Elementary School, Steamboat Springs, Colorado, 9:00 a.m., 970.819.0637
25 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
26 Narrowleaf Lake Run, 4M/7M/10M, Boyd Lake State Park, Loveland, Colorado, 9:00 a.m., 970.363.6499
26 Ghosts & Goblins 5k, City Park, Denver, Colorado, 9:00 a.m., 720.985.9047
November 2025
1 City Park 5k, Denver, Colorado, 9:00 a.m., 720.722.4226
1 CO Brewery Running Series, Los Muertos 5k, Cheluna Brewing, Aurora, Colorado, 10:00 a.m., 303.955.7410
1 Colorado 24 Hour Run, 6H/12H/24H, CO Youth Outdoors, Fort Collins, Colorado, 8:00 a.m., racedirector@gnarrunners.com
1 Colorado Springs Girls on the Run, 5k, America the Beautiful Park, Colorado Springs, Colorado, 10:00 a.m., 720.879.2354
1 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
2 Alamosa Veterans Memorial Park Race, 5k/10k, Family Recreation Center, Alamosa, Colorado, 10:00 a.m., alamosamemorial@gmail.com
2 CO Brewery Running Series/Five Alarm 5k, Bierstadt Lagerhaus, Denver, Colorado, 10:00 a.m., 303.955.7410
2 Feet for Justice Run, 5k/10k, City Park, Denver, Colorado, 8:30 a.m., feetforjusticerun@gmail.com
2 Panda Waddle, 5k, Longs Family Park, Grand Junction, Colorado, 10:00 a.m., 970.250.0786
2 PPRC Fall XC Series #3, 5.5M, Pinon Valley Park, Colorado Springs, 10:00 a.m., 719.648.9996
2 Rim Rock Races, 12k/Half Marathon/Marathon, Colorado National Monument to James Rob State Park, Fruita, Colorado, 8:00 a.m., 970.248.1469
8-9 Moab Trail Marathon, Kids K/10k/Half Marathon, Marathon, Kane Creek Trail Head, Moab, Colorado, 7:45 a.m., 970.389.4838
8 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
8 Bell Ringer Run, 4M, North Lake Park, Loveland, Colorado, 2:30 p.m., 970.215.9642
8 Bingo! Trail Runs, 10k/8M/10k/50k/50M, May Farms, Byers, 6:00 a.m., 303.521.5856
8 Littleton CMRA Veterans Day Run, 6.6M, Hildebrand Ranch Park, Littleton, Colorado, 9:00 a.m., 303.781.1738
8 Denver Veterans Day Run, 5k/10k, City Park, Denver, Colorado, 8:00 a.m., 720.425.2978
8 HRCA Backcountry Wilderness Half Marathon, Paint Brush Park, Highlands Ranch, Colorado, 8:30 a.m., 303.471.7048
8 Kessel Ultra Run, 10M/20M/60k/50M, North Fruita Desert, Fruita, Colorado, 6:00 a.m., 719.429.9501
8 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
9CO Brewery Running Series/Veterans Day 5k, Goat Patch Brewing, Colorado Springs, Colorado, 10:00 a.m., 303.955.7410
9 The Great Candy Run, 5k, Washington Park, Denver, Colorado, 10:00 a.m., 303.694.2202
15 Longmont Turkey Trot, 2M/10k, Altona Middle School, Longmont, Colorado, 9:00 a.m., 303.651.8406
15 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
15 Denver Pumpkin Pie Run, 5k/10k, City Park, Denver, Colorado, 4:00 p.m., 720.985.9047
15 Louisville Races, 5k/10k/Marathon, Community Park, Louisville, Colorado, 7:00 a.m., 858.775.7104
16 PPRC Fall XC Series #4, 7.4M, Palmer Park, Colorado Springs, Colorado, 10:00 a.m., 719.648.9996
22 Brighton Turkey Trot, 5k, Recreation Center, Brighton, Colorado, 8:30 a.m., 303.655.2000
22 Arvada Turkey Trek, 2k/5k/10k, Long Lakes Sports Complex, Arvada, Colorado, 8:30 a.m., 720.722.4226
22 Aspen Park Run, 5k, Aspen Golf Club, Aspen, Colorado, 9:00 a.m., aspen@parkrun.com
22 Colorado Cold Rush, 10k/Half Marathon/50k, Bear Creek Regional Park, Colorado Springs, Colorado, 719.590.1466
22 Colorado Springs Turkey Trot Predict, 5k, Memorial Park, Colorado Springs, Colorado, 10:00 a.m., 719.598.2953
22 Denver Mile High Turkey Trot, 4M, Washington Park, Denver, Colorado, 10:15 a.m., 303.694.2202
22 Parker Turkey Day 5k, Cherry Creek Trail, Parker, Colorado, 8:00 a.m., 303.805.3278
22 South Boulder Creek Park Run, 5k, East Boulder Community Center, Boulder, Colorado, 9:00 a.m., southbouldercreek@parkrun.com
22 Wheat Ridge Feed Your Soul Turkey Trot, 5k, Prospect Park, Wheat Ridge, Colorado, 9:00 a.m., 303.880.1732
22 Windsor Pelican Lakes Turkey Trot, 5k, Pelican Lakes, Windsor, Colorado, 9:00 a.m., 970.213.7258
December 2025
6 CO Brewery Running Series/Ugly Sweater 5k, Left Hand Brewing, Longmont, Colorado, 10:00 a.m., 303.955.7410
6 Race of the Santas, 0.84M, The Canteen, Breckenridge, Colorado, 4.20 p.m., 970.453.1734
6 Sawmill Trail Runs, 8M/16M/50k, Ranch Hand Picnic Area Ð Staunton State Park, Pine, Colorado, 7:00 a.m., 720.624.9237
7 Rock Canyon Half Marathon, Pueblo City Park, Pueblo, Colorado, 9:00 a.m.
7 RMRR Wash Park 4.5 Miler, Denver, Colorado, 9:00 a.m., 303.871.8366
7 Rudolph Ramble, 5k, City Park, Denver, Colorado, 10:00 a.m., 303.694.2202
13 CMRA Sand Creek Run, 5M, Bluff Nature Center, Denver, Colorado, 10:00 a.m., 720.480.2370
13 Santa Catch Run, 5k/10k, Power to Play, Windsor, Colorado, 9:00 a.m., 970.213.7258
13 Santa Shuffle, 5k, Fleet Feet, Littleton, Colorado, 9:00 a.m., 303.522.4387
13 Sweaty Sweater Run, 5k, Horsetooth Reservoir, Fort Collins, Colorado, 10:00 a.m., 970.556.3279
14 Jingle Bell Run, 1M/5k, Washington Park, Denver, Colorado, 10:15 a.m., 720.644.4397
21 Ugly Sweater Run, 5k, Washington Park, Denver, Colorado, 9:00 a.m., 720.985.9047
31 Fort Collins Resolution Run, 5k, Edora Pool, Fort Collins, Colorado, 6:00 p.m., 303.946.9320
February 2026
22 Stories Ultra, 10k/Half Marathon/6Hr/15Hr/30Hr, Cheyenne Mountain State Park, Colorado Springs, Colorado, 6:00 a.m., 720.624.9237
March 2026
14 Sharin O the Green, 5k, Library Park, Fort Collins, Colorado, 8:30 a.m., 970.484.7123
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