Colorado Half Marathons by Date • By City
Browse all 2021-2022 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.
January 2022
| Sat Jan 8 | All-Out Polar Prowl Half Marathon 10K & 5K | Arvada CO |
| Sun Jan 16 | Arctic Prairie Dog Half Marathon 10K & 5K | Louisville CO |
February 2022
| Sat Feb 26 | All-Out Mardi Crawl Half Marathon 10K & 5K | Arvada CO |
March 2021
| Sun Mar 7 | That Dam Run Half Marathon 10K & 5K | Greenwood Village CO |
| Tue Mar 9 | Dust Bowl Series Marathon Half Marathon 10K & 5K – Day 5 | Lamar CO |
| Sat Mar 13 | Run Through Time Marathon Half Marathon & 2-Mile | Salida CO |
| Sun Mar 21 | All-Out Spring Fever Half Marathon 10K & 5K | Golden CO |
| Sun Mar 21 | Spring Equinox Half Marathon | Fort Collins CO |
April 2021
| Sat Apr 3 | Runs with Scissors Marathon Half Marathon & 50K | Brighton CO |
| Sat Apr 3 | Three Creeks Half Marathon | Denver CO |
| Sun Apr 11 | Spring Fling Prairie Dog Half Marathon 10K & 5K | Arvada CO |
| Sat Apr 17 | All-Out Beat the Heat Marathon Half Marathon 10K & 5K | Westminster CO |
| Sun Apr 18 | Desert RATS Trail Running Festival | Fruita CO |
| Sat Apr 24 | Westminster Trail Half Marathon 10K & 5K | Broomfield CO |
May 2021
| Sat May 1 | Fruita Trail Half Marathon | Fruita CO |
| Sat May 8 | Carbon Valley Half Marathon | Firestone CO |
| Sat May 8 | Mine Shaft Half & Tommyknocker Ultras | Golden CO |
| Sat May 15 | Vallecito Lake Heavy Half | Bayfield CO |
| Sun May 23 | Barr Lake Half Marathon & 15K | Brighton CO |
| Sat May 29 | Valkyrie Trail Marathon Half Marathon 50K & 4-Mile | Colorado Springs CO |
June 2021
| Sat Jun 5 | Bergen Peak Half Marathon | Evergreen CO |
| Sat Jun 5 | Revel Rockies Marathon & Half Marathon | Evergreen CO |
| Sun Jun 6 | Boulder Rez Half Marathon 10K & 5K | Boulder CO |
| Sun Jun 6 | Colorado 13er Half Marathon 10K & 5K | Louisville CO |
| Sun Jun 6 | Steamboat Marathon Half Marathon & 10K | Steamboat Springs CO |
| Sat Jun 12 | South Park Trail Marathon & Half Marathon | Fairplay CO |
| Sat Jun 12 | Steamworks Half Marathon | Durango CO |
| Sat Jun 19 | Mountain Ridge Half Marathon & 10K | Highlands Ranch CO |
| Sun Jun 20 | Estes Park Marathon Half Marathon 10K & 5K | Estes Park CO |
| Sat Jun 26 | All-Out Summer Breeze Half Marathon 10K 5K & 1-Mile | Arvada CO |
| Sat Jun 26 | Slacker Half Marathon 4-Mile & Relay | Georgetown CO |
July 2021
| Sun Jul 4 | Longmont Half Marathon & 5K | Longmont CO |
| Sat Jul 17 | All-Out Dog Days Half Marathon 10K & 5K | Westminster CO |
| Sat Jul 17 | Prairie Dog Half Marathon 10K & 5K | Castle Rock CO |
| Sun Jul 18 | Black Hawk Half Marathon & 10K | Golden CO |
| Sun Jul 18 | Sunlight Showdown Half Marathon | Glenwood Springs CO |
| Sat Jul 31 | Rocky Mountain Half Marathon | Estes Park CO |
| Sat Jul 31 | Winter Park Half Marathon & 5K | Winter Park CO |
August 2021
| Sun Aug 8 | Emerald Mountain Epic Marathon & Half Marathon | Steamboat Springs CO |
| Sat Aug 14 | Boulder Rez Marathon 3/4 Marathon Half Marathon & 10K | Boulder CO |
| Sat Aug 14 | Georgetown to Idaho Springs Half Marathon | Georgetown CO |
| Sat Aug 14 | Run the Rockies Trail Half Marathon & 10K | Frisco CO |
| Sat Aug 21 | All-Out Runapalooza Half Marathon 10K & 5K | Arvada CO |
| Sat Aug 21 | Mount Sneffels Marathon & Half Marathon | Ouray CO |
| Sun Aug 22 | Erie Half Marathon & 5K | Erie CO |
| Sat Aug 28 | Louisville Trail Race Half Marathon 10K & 5K | Louisville CO |
| Sat Aug 28 | Staunton Rocks! Marathon & Half Marathon | Pine CO |
| Sat Aug 28 | Thirsty 13 Half Marathon | Durango CO |
September 2021
| Mon Sep 6 | Labor Day Half Marathon | Parker CO |
| Sat Sep 11 | Black Squirrel Half Marathon | Fort Collins CO |
| Sat Sep 11 | Ned*Ned Half Marathon 10K & 5K | Nederland CO |
| Sun Sep 12 | Breckenridge Marathon Half Marathon & 10K | Breckenridge CO |
| Mon Sep 13 | Center of the Nation Marathon Half Marathon 10K & 5K – Day 1 | Sterling CO |
| Sat Sep 18 | All-Out Fall Fest Marathon Half Marathon 10K & 5K | Westminster CO |
| Sat Sep 18 | Autumn Color Run Half Marathon 10K & 5K | Buena Vista CO |
| Sat Sep 18 | Golden Leaf Half Marathon | Aspen CO |
| Sat Sep 18 | Mountain Rats Marathon Half Marathon & 55K | Eagle CO |
| Sun Sep 19 | Equinox Marathon Half Marathon & 5-Mile | Fort Collins CO |
| Sun Sep 19 | Snow Mountain Ranch Trail Running Festival | Granby CO |
| Sat Sep 25 | Pioneer Prairie Dog Half Marathon 10K & 5K | Westminster CO |
| Sun Sep 26 | Adams Half Marathon & 5K | Brighton CO |
| Sun Sep 26 | Bear Chase Trail Half Marathon & 10K | Lakewood CO |
October 2021
| Sat Oct 2 | Deep Creek Trail Half Marathon | Telluride CO |
| Sun Oct 3 | Long View Marathon & Half Marathon | Fort Collins CO |
| Sun Oct 3 | 'Rad Dirt Fest Half Marathon & Ultras | Trinidad CO |
| Sun Oct 3 | Rim to Royal Gorge Half Marathon | Cañon City CO |
| Sun Oct 10 | Boulderthon Marathon & Half Marathon | Boulder CO |
| Sun Oct 10 | Windsor Marathon Half Marathon & Heavy 10K | Windsor CO |
| Sat Oct 16 | Aspen Valley Marathon Half Marathon & 5K | Aspen CO |
| Sun Oct 17 | Colfax Marathon Half Marathon 10-Mile & Relay | Denver CO |
| Sun Oct 24 | Colorado Marathon Half Marathon 10K & 5K | Fort Collins CO |
| Sun Oct 24 | Westy Half & 5K | Westminster CO |
| Sun Oct 31 | All-Out Kooky-Spooky Half Marathon 10K & 5K | Golden CO |
November 2021
| Sat Nov 6 | Backcountry Wilderness Half Marathon | Highlands Ranch CO |
| Sat Nov 6 | Rim Rock Marathon & Half Marathon | Grand Junction CO |
| Mon Nov 8 | Southwest Series Marathon Half Marathon 10K & 5K – Day 2 | Durango CO |
| Sun Nov 14 | Horsetooth Half Marathon | Fort Collins CO |
December 2021
| Sat Dec 4 | All-Out Fa La La Half Marathon 10K & 5K | Westminster CO |
