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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2023-2024


Chilly Cheeks Winter Duathlon Series
Feb. 24, 2024


Superior Stocking Run
Dec. 2024


Yeti Chase 5K/10K
Jan. 2025


Ralston Creek Half Marathon & 5K
Feb. 18, 2024


Three Creeks Half Marathon
April 7, 2024


Mt. Evans Ascent
June 23, 2024


Winter Running Series
Winter 2023-2024


Chilly Cheeks Winter Duathlon Series
Feb. 24, 2024


Superior Stocking Run
Dec. 2024


Yeti Chase 5K/10K
Jan. 2025


Ralston Creek Half Marathon & 5K
Feb. 18, 2024



February 2024

Racing Underground February 2024 Events

Date Event Location Website
24 Chilly Cheeks Duathlon Cherry Creek State Park - Denver, CO Website

Details: Due to road construction in the park, the Chilly Cheeks Series is just a single event in 2024. The February 24th event is a run-bike-run event with each run being 2.5 miles with an 11 mile bike ride in between. The run covers a mix of road, paved bike path and well maintained dirt trails. The bike route is 100 percent paved roads. Road bike and fat tire divisions are offered. Post race hot food & drinks provided.

Other area February 2024 Events


March 2024

  • 2 Cerus Dry Tri (Row/Bike/Run in 45min), Cerus Gym, Frederick, 8:00 a.m., 720.277.3282

May 2024

  • 18 Pole Pedal Paddle, (1.9M Ski/27.3M Bike/4.7M Paddle), Crested Butte Mountain Resort to Gunnison Whitewater Park, Crested Butte, Colorado, 10:00 a.m., 719.221.1710
  • 19 Ordinary Mortals Triathlon, (5k Run/12M Bike/300Y Swim), CSU Student Center, Pueblo, Colorado, 9:00 a.m., 719.549.3363
  • 25 Valley Bottom Rio Trio, (8M Bike/3M Paddle/5k Run), State Ave Bridge, Alamosa, Colorado, 9:30 a.m., 719.589.2105
  • 30 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195

June 2024

  • 1 - Colorado Triathlon - (750m Swim/17M Bike/5k Run) - Boulder Reservoir - Boulder, Colorado - 7:30 a.m.- 303.408.1195
  • 5 Boulder Stroke & Stride (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 8 Ironman Boulder (1.2M Swim/56M Bike/13M Run), Boulder Reservoir, Boulder, Colorado, 813.868.5940
  • 8 Tri for the Sun, (750m Swim/12.4M Bike/5k Run), John M Fleet Pool, Carbondale, 7:00 a.m., 970.510.1214
  • 13 Boulder Stroke & Stride (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 15 - XTERRA Lory Triathlon - (0.5M Swim/12.2M Bike/4.8M Run) - Lory State Park - Bellevue, Colorado - 7:50 a.m.- 303.408.1195
  • 17 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 20 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 22 Lake to Lake Triathlon (1.5k Swim/30M Bike/10k Run) (1.5k Paddle/30M Bike/10k Run), High School, Loveland, Colorado, 6:30 a.m., 970.669.6372
  • 23 South Suburban Kids & Adult Triathlon, Goodson Recreational Center, Centennial, Colorado, 6:40 a.m., 303.483.7034
  • 24 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 27 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195

July 2024

  • 1 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 6 Sheep Creek Triathlon, (1M Jog/3Holes Frisbee Gold/Tube-Paddle-Kayak down a river), Antonito, Colorado, 10:00 a.m., cameroneanes@gmail.com
  • 8 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 12 Frisco Triathlon (3k Paddle/12k Bike/5k Run), Frisco Bay Marina to Pine Cove Boat Ramp, Frisco, Colorado, 9:00 a.m., 970.668.2558
  • 13 Kids Tryathlon (various based on age), H2OBrien Pool, Parker, Colorado, 6:30 a.m., 303.841.4500
  • 13 LG Tri Splash, Grind Sprint Triathlon, (500Y Swim/12M Bike/5k Run) (Kids: various distances), Eagle Pool, Eagle, Colorado, 7:00 a.m., terri@vvcf.org
  • 14 - Boulder Peak Triathlon - (1.5k Swim/42k Bike/10k Run) - Boulder Reservoir - Boulder, Colorado - 303.408.1195
  • 15 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 18 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 22 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 25 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 27 South Suburban Kids Triathlon (200Y Swim/4M Bike/2M Run), Cook Creek Pool, Centennial, Colorado, 6:30 a.m., 303.347.5999
  • 28 - Steamboat Lake Triathlon - (750m Swim/12.4M Bike/3.5M Run) (750m Swim/12.4M Bike) (750m PaddleBoard/12.4M Bike/3.5M Run) - Steamboat Lake State Park - Steamboat Springs, Colorado - 303.408.1195
  • 29 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060

August 2024

  • 1 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 3 Splash Mash Dash Kids Triathlon, (various distances), Northridge Recreation Center, Highlands Ranch, Colorado, 9:00 a.m., 303.471.7048
  • 4 - Stagecoach Gravel Triathlon - 750m Swim or Paddle/16M Bike/4M Run & Aquabike, Stagecoach Reservoir, Steamboat Springs, Colorado, 8:00 a.m., 303.408.1195
  • 5 Dunk N Dash, (800m Swim/5k Run), Nottingham Lake, Avon, Colorado, 6:00 p.m., 970.748.4060
  • 8 Boulder Stroke & Stride, (750 or 1500m Swim/5k Run), Boulder Reservoir, Boulder, Colorado, 6:00 p.m., 303.408.1195
  • 18 - Outdoor Divas Triathlon - (750m Swim/12.4M Bike/5k Run) - Union Reservoir- Longmont, Colorado - 8:00 a.m.- 303.408.1195

September 2024

  • 7 - Littlefoot Triathlon - (750m Swim 15k Bike/5k Run) - Bear Creek Lake Park - Lakewood, Colorado - 7:00 a.m.- 303.408.1195
  • 7 Lake Nighthorse Sprint Tri (750m Swim/12.4M Bike/5k Run), Durango, Colorado, 9:00 a.m., 281.467.4072
  • 8 Tri the Rock (youth distances by age group), Recreation Center, Castle Rock, Colorado, 7:00 a.m., 303.660.1036
  • 14 Splashland Adult Triathlon (3.4M Run/10M Bike/400Y Swim), Splashland Pool, Alamosa, Colorado, 9:00 a.m., 719.589.6258
  • 28 Black Canyon Triathlon (500m Swim/24k Bike/5k Run), Community Recreation Center, Montrose, Colorado, 8:00 a.m., 970.596.4108
  • 29 - Last Call Triathlon - Various Events & Distances - Boys Lake State Park - Loveland, Colorado - 7:00 a.m.
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