Colorado Half Marathons by Date • By City
Browse all 2022-2023 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 2022
| Sat Dec 3 | All-Out Fa La La Half Marathon 10K & 5K | Westminster CO |
| Sat Dec 3 | Four Corners Quad Keyah Marathon Half Marathon 5k & 2M | Four Corners Monument CO |
| Sun Dec 4 | Rock Canyon Half Marathon | Pueblo CO |
January 2023
| Sat Jan 7 | All-Out Polar Prowl Half Marathon 10k & 5k | Arvada CO |
| Sun Jan 15 | Arctic Prairie Dog Half – Westminster Half Marathon 10k & 5k | Westminster CO |
February 2023
| Sat Feb 4 | All-Out Mardi Crawl Half Marathon 10K & 5K | Arvada CO |
| Sun Feb 12 | Super Half Marathon & 5k | Colorado Springs CO |
| Sun Feb 19 | Ralston Creek Half Marathon & 5k | Arvada CO |
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
| 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 |
| 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
| Sun May 7 | Colorado Marathon Half Marathon 10K & 5K | Fort Collins 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 | Ram Party 50M Marathon & Half Marathon | Colorado Springs CO |
| Sun May 14 | Fruita Trail Half | Fruita CO |
| Sun May 14 | Barr Lake Half Marathon & 15k | Brighton CO |
| Sun May 14 | Fruita Trail Half | Fruita 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 |
| Sun May 28 | Spirit Trail Run Marathon Half Marathon & 8k | Buena Vista CO |
June 2023
| 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 | All-Out Summer Breeze Half Marathon 10k 5k & 1M | Arvada CO |
| Sun Jun 18 | Estes Park Marathon & Half Marathon | Estes Park 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 |
| Sun Jul 16 | Black Hawk Trail Half Marathon & 10k | Golden 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 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 |
September 2023
| Mon Sep 4 | Labor Day Half Marathon | Parker CO |
| Sat Sep 9 | Black Squirrel Half Marathon | Fort Collins CO |
| Sat Sep 16 | All-Out Fall Fest Marathon Half Marathon 10K & 5K | Westminster CO |
| Sat Sep 16 | Autumn Color Run Half Marathon 10k 5k & 1M | Buena Vista CO |
| Sun Sep 17 | Adams Half & 5k | Brighton CO |
| Sun Sep 17 | Fall Equinox Marathon Half Marathon & 5M | Fort Collins CO |
| Sat Sep 23 | Pioneer Prairie Dog Half Marathon 10K & 5K | Westminster CO |
| Sat Sep 23 | Red Feather Trail Jamboree 50k & Half Marathon | Red Feather Lakes CO |
| Sat Sep 23 | Snow Mountain Ranch Trail Festival Half Marathon | Granby CO |
| Sat Sep 30 | Colorado Springs Marathon Half Marathon & 5k | Colorado Springs CO |
October 2023
| Mon Oct 2 | Center of the Nation Series – Day 1 Marathon & Half Marathon | Sterling CO |
| Sun Oct 8 | Boulderthon Marathon & Half Marathon | Boulder CO |
| Sun Oct 8 | Rim to Rim Royal Gorge Races Half Marathon | Canon City 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 |
