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.
September 2023
October 2023
Sun Oct 1 | Colorado Brewery Running Series – New Belgium Brewing Half Marathon | Fort Collins CO |
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 | Castle Rock Trail Festival 50k Half Marathon 10k & 5k | Castle Rock 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 |
Sat Oct 14 | Mancos Cowboy Half Marathon & 5k | Mancos 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 |
Sun Nov 5 | Rim Rock Run Marathon & Half Marathon | Fruita 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 CO |
Sun Feb 11 | Super Half Marathon and Game Day 5k | Colorado Springs CO |
Sun Feb 18 | Stories Ultra 6H Half Marathon & 10k | Colorado Springs CO |
March 2024
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
Sat Apr 13 | All-Out Beat the Heat Marathon Half Marathon 10K & 5K | Westminster 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 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 | Valkyrie Trail Race Half Marathon | Colorado Springs 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 26 | Spirit Trail Run Marathon Half Marathon & 8k | Buena Vista CO |
June 2024
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 | Longmont Half Marathon & 5K | Longmont CO |
Sat Jul 13 | All-Out Dog Days Half Marathon 10K & 5K | Westminster 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 | Rocky Mountain Half Marathon | Estes Park CO |
Sat Aug 17 | Mount Sneffels Marathon & Half Marathon | Ouray CO |