Colorado Race Calendar

Colorado Half Marathons by Date • By City

Browse all 2023-2024 Colorado half marathons by month below. For each race, you’ll find course maps, elevation profiles, runner reviews, and how to sign up.

When you view a race, you’ll also find contact info if you’re having problems with your registration or need to contact the race directors.

March 2023

Sun Mar 5 That Dam Run Half Marathon 10k & 5k Greenwood Village CO
Sat Mar 11 Run Through Time Marathon Half Marathon & 2M Salida CO
Sun Mar 19 All-Out Spring Fever Half Marathon 10K & 5K Golden CO
Sun Mar 26 Spring Equinox Half Marathon & 4M Fort Collins CO

April 2023

May 2023

June 2023

Sat Jun 3 Basalt Half Marathon Basalt CO
Sat Jun 3 Bergen Peak Half Marathon Evergreen CO
Sat Jun 3 Revel Rockies Marathon & Half Marathon Evergreen CO
Sat Jun 3 South Park Trail Marathon Half Marathon & Ultra Fairplay CO
Sun Jun 4 Colorado 13er Half Marathon 10k & 5k Louisville CO
Sun Jun 4 Steamboat Marathon Half Marathon & 10K Steamboat Springs CO
Sat Jun 10 Evit's Hope Half & 5k Colorado Springs CO
Sat Jun 10 All-Out Summer Breeze Half Marathon 10k 5k & 1M Arvada CO
Sat Jun 10 Steamworks Half Marathon Durango CO
Sun Jun 11 Colorado Brewery Running Series – Breckenridge Brewing Half Marathon & 5k Breckenridge CO
Sun Jun 18 Estes Park Marathon & Half Marathon Estes Park CO
Sat Jun 24 Slacker Half Marathon & 4M Georgetown CO
Sat Jun 24 Westminster Trail Half Marathon 10k & 5k Westminster CO

July 2023

Tue Jul 4 Live Free ROCK-IT Run Half Marathon 5k & 1k Castle Rock CO
Tue Jul 4 Longmont Half Marathon & 5K Longmont CO
Sat Jul 8 All-Out Dog Days Half Marathon 10K & 5K Westminster CO
Sat Jul 15 Aspen Valley Marathon Half Marathon & 5k Aspen CO
Sat Jul 15 Prairie Dog Half Marathon 10K & 5K Castle Rock CO
Sat Jul 15 Summer Sizzler Half Marathon 10k & 5k Colorado Springs CO
Sat Jul 29 Living Journeys Half Marathon Mt. Crested Butte CO
Sat Jul 29 Rocky Mountain Half Marathon Estes Park CO

August 2023

Sat Aug 5 All-Out Runapalooza Half Marathon 10K & 5K Arvada CO
Sat Aug 5 Human Race Half Marathon 10k & 5k Fort Collins CO
Sun Aug 6 Emerald Mountain Epic Marathon & Half Marathon Steamboat Springs CO
Sat Aug 12 Boulder Rez Marathon 19.7M Half Marathon & 10k Boulder CO
Sat Aug 12 Georgetown to Idaho Springs Half Marathon Georgetown CO
Sat Aug 12 Run the Rockies Trail Race Half Marathon & 10k Frisco CO
Sat Aug 19 Dynafit Half Marathon & 5k Vail CO
Sat Aug 19 Hometown Half Marathon 10k & 5k Colorado Springs CO
Sat Aug 19 Mount Sneffels Marathon & Half Marathon Ouray CO
Sun Aug 20 Erie Half Marathon & 5K Erie CO
Sat Aug 26 Louisville Trail Race Half Marathon 10k & 5k Louisville CO
Sat Aug 26 Staunton Rocks! Marathon & Half Marathon Pine CO
Sat Aug 26 Thirsty 13 Half Marathon Durango CO
Sat Aug 26 Winter Park Half Marathon & 5k Winter Park CO

September 2023

October 2023

November 2023

December 2023

Sat Dec 2 Colorado Cold Rush 50k & Half Marathon Colorado Springs CO
Sat Dec 2 All-Out Fa La La Half Marathon 10K & 5K Westminster CO
Sun Dec 3 Rock Canyon Half Marathon Pueblo CO
Sun Dec 10 Four Corners Quad Keyah Marathon Half Marathon & 5k Four Corners Monument CO

January 2024

February 2024

Sun Feb 11 All-Out Mardi Crawl Half Marathon 10K & 5K Arvada C
Sun Feb 18 Stories Ultra 6H Half Marathon & 10k Colorado Springs CO

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