Colorado
Calendars

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Guide to Races in Colorado

Featured Events

Winter Running Series
Winter 2022-2023

Chilly Cheeks Winter Duathlon Series
Winter 2022-2023

Superior Stocking Run
Dec. 11, 2022

Yeti Chase 5K/10K
Jan. 29, 2023

Ralston Creek Half Marathon & 5K
Feb. 19, 2023

Three Creeks Half Marathon
April 1, 2023

Barkin' Dog Duathlon
April 22, 2023

Mt. Evans Ascent
June 25, 2023

Littlefoot Triathlon
Sept. 9, 2023

Winter Running Series
Winter 2022-2023

Chilly Cheeks Winter Duathlon Series
Winter 2022-2023

Superior Stocking Run
Dec. 11, 2022

Yeti Chase 5K/10K
Jan. 29, 2023

Ralston Creek Half Marathon & 5K
Feb. 19, 2023

Colorado Regional Calendars

Welcome to our regional Running, Triathlon, Duathlon, and Snowshoe Calendars. You will find links to events owned and times by Racing Underground, however we list most all Colorado races on these calendars. Colorado has some of the best events in the world, but please verify race info before making the trip!
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