Upcoming races in Colorado. Use filters to quickly find races by distance, city, month or race type.
More races: USA running calendar
Date Race Distance City hf:tax:distancecategory hf:tax:city hf:tax:typerace hf:tax:monthandyear 12/14/2024 WinterFest 5K 5K Denver CO 5k denver-co roadrace 12-december 12/14/2024 Santa Catch 5K & 10K 10K, 5K Windsor CO 10k 5k windsor-co roadrace 12-december 12/14/2024 WinterFest 5K & Fun Run 5K Thornton CO 5k thornton-co roadrace 12-december 12/15/2024 Ugly Sweater 5K 5K Denver CO 5k denver-co roadrace 12-december 12/21/2024 Santa’s Dash for Cash 1M, 5K Denver CO 5k denver-co roadrace 12-december 12/21/2024 Candy Cane Course – Colorado Springs 12K, 5K Colorado Springs CO 10k-to-half-marathon 5k colorado-springs-co roadrace 12-december 12/22/2024 Candy Cane Course – Denver 12K, 5K Westminster CO 10k-to-half-marathon 5k westminster-co roadrace 12-december 01/11/2025 All-Out Polar Prowl Half Marathon 10K, 13.1M, 5K Arvada CO 10k 5k half arvada-co roadrace 01-january 01/19/2025 Arctic Prairie Dog Half Marathon 10K, 13.1M, 5K Westminster CO 10k 5k half westminster-co roadrace 01-january 02/09/2025 Super Half Marathon and Game Day 5K 13.1M, 5K Colorado Springs CO 5k half colorado-springs-co roadrace 02-february 02/15/2025 Stories Ultra 10K, 13.1M, 15H, 30H, 6H Colorado Springs CO 10k half ultra colorado-springs-co trail 02-february 02/16/2025 Ralston Creek Half Marathon 13.1M, 5K Arvada CO 5k half arvada-co roadrace 02-february 02/22/2025 All-Out Mardi Crawl 5K, 10K and Half Marathon 10K, 13.1M, 5K Arvada CO 10k 5k half arvada-co trail 02-february 02/23/2025 Highlands Ranch 5K Highlands Ranch CO 5k highlands-ranch-co roadrace 02-february 03/02/2025 That Dam Run 10K, 13.1M, 5K Denver CO 10k 5k half denver-co roadrace 03-march 03/08/2025 Run Through Time Trail Marathon 13.1M, 26.2M, 2M Salida CO half marathon salida-co trail 03-march 03/23/2025 Spring Equinox Half Marathon 13.1M, 4M Fort Collins CO half fort-collins-co trail 03-march 04/01/2025 Steve’s Event Page 5K Morrison CO 5k morrison-co roadrace 04-april 04/11/2025 Desert RATS Trail Running Festival 100K, 10K, 13.1M, 50K Fruita CO 10k half ultra fruita-co trail 04-april 04/13/2025 Platte River Half Marathon 13.1M Littleton CO half littleton-co roadrace 04-april 04/13/2025 Three Creeks Half Marathon 13.1M Denver CO half denver-co roadrace 04-april 04/13/2025 The Spring Fling Prairie Dog Half 10K, 13.1M, 5K Arvada CO 10k 5k half arvada-co roadrace 04-april 04/13/2025 Horsetooth Half Marathon 13.1M Fort Collins CO half fort-collins-co roadrace 04-april 04/26/2025 Runs with Scissors Races 13.1M, 26.2M, 50K Brighton CO half marathon ultra brighton-co trail 04-april 04/26/2025 Royal Gorge Groove Trail Runs 12K, 20K, 30K, 50K, 5K Caรฑon City CO 10k-to-half-marathon 5k half half-marathon-to-full-marathon ultra canon-city-co trail 04-april 05/04/2025 Longmont Half Marathon 13.1M, 5K Longmont CO 5k half longmont-co roadrace 05-may 05/04/2025 Colorado Marathon 10K, 13.1M, 26.2M, 5K Fort Collins CO 10k 5k half marathon fort-collins-co roadrace 05-may 05/10/2025 Valkyrie Trail Race 13.1M, 26.2M, 30K, 4M, 50K, 8M Colorado Springs CO 10k-to-half-marathon half half-marathon-to-full-marathon marathon ultra colorado-springs-co trail 05-may 05/11/2025 Fruita Trail Half 13.1M Fruita CO half fruita-co trail 05-may 05/17/2025 Habitat Archuleta’s 15 Homes in 5K Fun Run 5K Pagosa Springs CO 5k pagosa-springs-co roadrace 05-may 05/17/2025 Endure Trail Runs 10K, 12H, 13.1M, 24H Divide CO 10k half ultra divide-co trail 05-may 05/17/2025 Canine On the Creek 5K 1M, 5K Dumont CO 5k dumont-co roadrace 05-may 05/17/2025 Ram Party 15K, 24K, 50K, 55M, 60K Colorado Springs CO 10k-to-half-marathon half marathon ultra colorado-springs-co trail 05-may 05/17/2025 Denver Colfax Marathon 10M, 13.1M, 26.2M Denver CO 10k-to-half-marathon half marathon denver-co roadrace 05-may 05/24/2025 Weld Your Mettle Running Event 12H, 24H, 3H, 6H, 9H Eaton CO ultra eaton-co roadrace 05-may 05/25/2025 Spirit Trail Race 13.1M, 26.2M, 9K Buena Vista CO half marathon buena-vista-co trail 05-may 06/01/2025 Flamingo Day 5K 5K Denver CO 5k denver-co roadrace 06-june 06/01/2025 Crazy Legs 10K Trail Run 10K Loveland CO 10k loveland-co trail 06-june 06/01/2025 Steamboat Marathon 10K, 13.1M, 26.2M Steamboat Springs CO 10k half marathon steamboat-springs-co roadrace 06-june 06/01/2025 Colorado 13er 10K, 13.1M, 5K Louisville CO 10k 5k half louisville-co roadrace 06-june 06/07/2025 The Great Divide Ultra 100K, 100M, 25K, 50K Divide CO half-marathon-to-full-marathon ultra divide-co trail 06-june 06/15/2025 Father’s Day Classic 10K, 1M, 5K Arvada CO 10k 5k arvada-co roadrace 06-june 06/21/2025 Unicorn 5K (North) 5K Thornton CO 5k thornton-co roadrace 06-june 07/04/2025 ROCK-IT Run Half Marathon 13.1M, 5K Castle Rock CO 5k half castle-rock-co roadrace 07-july 07/04/2025 Let Freedom Run 10K, 5K Louisville CO 10k 5k louisville-co roadrace 07-july 07/04/2025 July 4th ROCK-IT Run 13.1M, 1K, 5K Castle Rock CO 5k half castle-rock-co roadrace 07-july 07/11/2025 Silverheels Trail Runs 100K, 100M, 10M, 18M, 50M, 60K Como CO half-marathon-to-full-marathon ultra como-co trail 07-july 07/12/2025 Cookie Chase 5K 5K Denver CO 5k denver-co roadrace 07-july 07/12/2025 All-Out Dog Days Half Marathon 10K, 13.1M, 5K Westminster CO 10k 5k half westminster-co roadrace 07-july 07/18/2025 Ouray 100 Mile Endurance Run 100M Ouray CO ultra ouray-co trail 07-july 07/19/2025 Firecracker 4 & 8 Mile – Denver 1M, 4M, 8M Denver CO 10k-to-half-marathon denver-co roadrace 07-july 07/19/2025 Summer Splash Prairie Dog Half Marathon 10K, 13.1M, 5K Castle Rock CO 10k 5k half castle-rock-co roadrace 07-july 07/20/2025 Firecracker 4 & 8 Mile – Colorado Springs 1M, 4M, 8M Colorado Springs CO 10k-to-half-marathon half-marathon-to-full-marathon colorado-springs-co roadrace 07-july 07/27/2025 Spirit of the West 5K 5K Golden CO 5k golden-co roadrace 07-july 08/01/2025 Annual Wild West Relay 200M Fort Collins CO ultra fort-collins-co roadrace 08-august 08/04/2025 TransRockies Run Charity Bibs120 Miles Buena Vista CO 120m buena-vista-co trail 08-august 08/16/2025 Summer Sizzler- Denver 10K, 15K, 5K Westminster CO 10k 10k-to-half-marathon 5k westminster-co roadrace 08-august 08/17/2025 Summer Sizzler- Colorado Springs 10K, 15K, 1M, 5K Colorado Springs CO 10k 10k-to-half-marathon 5k colorado-springs-co roadrace 08-august
Colorado Race Calendars:
5K Races | 10K Races |
Half Marathons | Marathons |
Ultra Marathons | Trail Races |
Denver | Colorado Springs |
Aurora | Fort Collins |