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.
December 2023
| Sat Dec 2 | All-Out Fa La La Half Marathon 10K & 5K | Westminster CO |
| Sat Dec 2 | Colorado Cold Rush 50k & Half Marathon | Colorado Springs 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 CO |
| Sun Feb 11 | Super Half Marathon and Game Day 5k | Colorado Springs CO |
| Sun Feb 18 | Ralston Creek Half Marathon & 5k | Arvada CO |
| Sun Feb 18 | Stories Ultra 6H Half Marathon & 10k | Colorado Springs CO |
March 2024
| Sat Mar 2 | Time to Paddy 5k 10k & Lucky 13.1 | Colorado Springs CO |
| Sun Mar 3 | That Dam Run Half Marathon 10k & 5k | Greenwood Village CO |
| Sun Mar 3 | Time to Paddy 5k 10k & Lucky 13.1 | Denver CO |
| Sat Mar 9 | Run Through Time Marathon Half Marathon & 2M | Salida CO |
| Sun Mar 17 | All-Out Spring Fever Half Marathon 10K & 5K | Golden CO |
| Sun Mar 24 | Spring Equinox Half Marathon & 4M | Fort Collins CO |
April 2024
| Sun Apr 7 | Three Creeks Half Marathon | Denver CO |
|---|---|---|
| Sat Apr 13 | All-Out Beat the Heat Marathon Half Marathon 10K & 5K | Westminster CO |
| Sat Apr 13 | Boulder Rez Half 10k & 5k | Boulder CO |
| Sun Apr 14 | Desert RATS Trail Running Festival Half Marathon & 10k | Fruita CO |
| Sun Apr 14 | Horsetooth Half Marathon | Fort Collins CO |
| Sun Apr 14 | Platte River Half Marathon & Relay | Littleton CO |
| Sun Apr 14 | Spring Fling Prairie Dog Half Marathon 10K & 5K | Arvada CO |
| Sat Apr 20 | Time Travel Half Marathon 10k & 5k | Westminster CO |
| Sun Apr 21 | Time Travel Half Marathon 10k & 5k | Colorado Springs CO |
| Sat Apr 27 | NOCO Half Marathon & 10k | Loveland CO |
| Sat Apr 27 | Runs with Scissors Races 50k Marathon & Half Marathon | Brighton CO |
May 2024
| Sun May 5 | Colorado Marathon Half Marathon 10K & 5K | Fort Collins CO |
| Sat May 11 | Carbon Valley Half Marathon & 5k | Firestone CO |
| Sat May 11 | Valkyrie Trail Race Half Marathon | Colorado Springs CO |
| Sat May 11 | Vallecito Lake Heavy Half | Bayfield CO |
| Sun May 12 | Fruita Trail Half | Fruita CO |
| Sat May 18 | Mine Shaft Half Marathon & Endure 12-Hour & 24-Hour Challenges | Divide CO |
| Sun May 19 | Denver Colfax Marathon Half Marathon 10M & Relay | Denver CO |
| Sun May 19 | Ram Party Marathon Half Marathon 9M & 5k | Colorado Springs CO |
| Sun May 26 | Spirit Trail Run Marathon Half Marathon & 8k | Buena Vista CO |
June 2024
| Sat Jun 1 | Mountain Ridge Trail Race 22M Half Marathon & 10k | Highlands Ranch CO |
| Sat Jun 1 | Revel Rockies Marathon & Half Marathon | Evergreen CO |
| Sun Jun 2 | Colorado 13er Half Marathon 10k & 5k | Louisville CO |
| Sun Jun 2 | Steamboat Marathon Half Marathon & 10K | Steamboat Springs CO |
| Sat Jun 8 | All-Out Summer Breeze Half Marathon 10k 5k & 1M | Arvada CO |
| Sun Jun 16 | Estes Park Marathon & Half Marathon | Estes Park CO |
July 2024
| Thu Jul 4 | July 4th ROCK-IT Run Half Marathon & 5k | Castle Rock CO |
| Thu Jul 4 | Longmont Half Marathon & 5K | Longmont CO |
| Sat Jul 13 | All-Out Dog Days Half Marathon 10K & 5K | Westminster CO |
| Sat Jul 13 | Aspen Valley Marathon Half Marathon & 5k | Aspen CO |
| Sat Jul 20 | Prairie Dog Half Marathon 10K & 5K | Castle Rock CO |
August 2024
| Sat Aug 3 | All-Out Runapalooza Half Marathon 10K & 5K | Arvada CO |
| Sat Aug 3 | Boulder Rez Marathon & Half Marathon | Boulder CO |
| Sat Aug 3 | Rocky Mountain Half Marathon | Estes Park CO |
| Sun Aug 4 | Emerald Mountain Epic Marathon & Half Marathon | Steamboat Springs CO |
| Sat Aug 10 | Georgetown to Idaho Springs Half Marathon | Georgetown CO |
| Sat Aug 17 | Mount Sneffels Marathon & Half Marathon | Ouray CO |
| Sun Aug 18 | Erie Half & 5k | Erie CO |
| Sat Aug 24 | Hometown Half Marathon 10k & 5k | Colorado Springs CO |
| Sat Aug 24 | Staunton Rocks! Marathon & Half | Pine CO |
| Sat Aug 24 | Thirsty 13 Half Marathon | Durango CO |
| Sat Aug 24 | Westminster Trail Race Half Marathon 10k & 5k | Westminster CO |
| Sun Aug 25 | Hometown Half Marathon 10k & 5k – Denver | Westminster CO |
September 2024
October 2024
| Sat Oct 5 | Castle Rock Trail Festival 50k Half Marathon 10k & 5k | Castle Rock CO |
| Sat Oct 5 | Rim to Rim Royal Gorge Races Half Marathon | Canon City CO |
| Sat Oct 5 | Spooky Sprint – Denver Half Marathon 10k & 5k | Westminster CO |
| Sun Oct 6 | Spooky Sprint – Colorado Springs Half Marathon 10k & 5k | Colorado Springs CO |
| Sun Oct 6 | Windsor Marathon Half Marathon 10k & 5k | Windsor CO |
| Sat Oct 12 | Long View Marathon & Half Marathon | Fort Collins CO |
| Sun Oct 13 | Westy Half & 5k | Westminster CO |
| Sun Oct 27 | All-Out Kooky-Spooky Half Marathon 10k 5k & 1M | Golden CO |
| TBD Oct 2024 | Colorado Brewery Running Series – New Belgium Brewing Half Marathon | Fort Collins CO |
| TBD Oct 2024 | Breckenridge Road Marathon Half Marathon & 10k | Breckenridge CO |
| TBD Oct 2024 | Mancos Cowboy Half Marathon & 5k | Mancos CO |
| TBD Oct 2024 | Latino Ultra Nature Adventure Half Marathon | Boulder CO |
November 2024
| Sat Nov 2 | HRCA Backcountry Wilderness Half Marathon | Highland Ranch CO |
| Mon Nov 11 | Southwest Series Day 2 Marathon Half Marathon & 5k | Durango CO |
| TBD Nov 2024 | Bridge Burner Ultra 50k 30k & Half Marathon | Canon City CO |
| TBD Nov 2024 | Rim Rock Run Marathon & Half Marathon | Fruita CO |
