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
| Sat Apr 1 | Three Creeks Half Marathon | Denver CO |
| Sun Apr 2 | Platte River Half Marathon & Relay | Littleton CO |
| Sat Apr 8 | Runs with Scissors Races 50k Marathon & Half Marathon | Brighton CO |
| Sat Apr 15 | All-Out Beat the Heat Marathon Half Marathon 10K & 5K | Westminster CO |
| Sat Apr 15 | Boulder Rez Half 10k & 5k | Boulder CO |
| Sun Apr 16 | Desert RATS Trail Running Festival Half Marathon & 10k | Fruita CO |
| Sun Apr 16 | Horsetooth Half Marathon | Fort Collins CO |
| Sun Apr 16 | Spring Fling Prairie Dog Half Marathon 10K & 5K | Arvada CO |
| Sun Apr 30 | Blue Heron Half and 5k | Brighton CO |
| Sun Apr 30 | Mountain Ridge Trail Half Marathon & 10k | Highlands Ranch CO |
May 2023
| Sat May 6 | Rock Hawk Trail Races Half Marathon 10k & 5k | Castle Rock CO |
| Sun May 7 | Colorado Marathon Half Marathon 10K & 5K | Fort Collins CO |
| Sun May 7 | Fruita Trail Half | Fruita CO |
| Sat May 13 | Carbon Valley Half Marathon 5k & 1M | Firestone CO |
| Sat May 13 | Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges | Divide CO |
| Sat May 13 | Vallecito Lake Heavy Half | Bayfield CO |
| Sat May 13 | Ram Party 50M Marathon & Half Marathon | Colorado Springs CO |
| Sat May 20 | Valkyrie Trail Race Marathon Half Marathon 50K & 4-Mile | Colorado Springs CO |
| Sun May 21 | Denver Colfax Marathon Half Marathon 10M & Relay | Denver CO |
| Sun May 21 | NOCO Half Marathon & 10k | Loveland CO |
| Sat May 27 | Time Travel Half Marathon 10k & 5k Colorado Springs | Colorado Springs CO |
| Sun May 28 | Spirit Trail Run Marathon Half Marathon & 8k | Buena Vista CO |
| Sun May 28 | Time Travel Half Marathon 10k & 5k Westminster | Westminster CO |
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
| Mon Oct 2 | Center of the Nation Series – Day 1 Marathon & Half Marathon | Sterling CO |
| Sat Oct 7 | Breckenridge Road Marathon Half Marathon & 10k | Breckenridge CO |
| Sat Oct 7 | Rim to Rim Royal Gorge Races Half Marathon | Canon City CO |
| Sun Oct 8 | Boulderthon Marathon & Half Marathon | Boulder CO |
| Sun Oct 8 | Windsor Marathon Half Marathon 10k & 5k | Windsor CO |
| Sat Oct 14 | Long View Marathon & Half Marathon | Fort Collins CO |
| Sun Oct 15 | Westy Half & 5k | Westminster CO |
| Sun Oct 29 | All-Out Kooky-Spooky Half Marathon 10k 5k & 1M | Golden CO |
November 2023
| Sat Nov 4 | Bridge Burner Ultra 50k 30k & Half Marathon | Canon City CO |
| Sat Nov 4 | HRCA Backcountry Wilderness Half Marathon | Highland Ranch CO |
| Mon Nov 6 | Southwest Series Day 2 Marathon Half Marathon & 5k | Durango CO |
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
| Sat Jan 6 | All-Out Polar Prowl Half Marathon 10k & 5k | Arvada CO |
| Sun Jan 14 | Arctic Prairie Dog Half – Westminster Half Marathon 10k & 5k | Westminster CO |
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 |
