Ultra Marathons in Colorado

Upcoming ultra marathons in Colorado. Use filters to quickly find races by month, city or race type.

More races:ย USA running calendar

Date RaceDistanceLocationhf:tax:monthandyearhf:tax:cityhf:tax:typerace
04/26/2025Runs with Scissors Races13.1M, 26.2M, 50KBrighton CO04-aprilbrighton-cotrail
04/26/2025Royal Gorge Groove Trail Runs12K, 20K, 30K, 50K, 5KCaรฑon City CO04-aprilcanon-city-cotrail
05/10/2025Valkyrie Trail Race13.1M, 26.2M, 30K, 4M, 50K, 8MColorado Springs CO05-maycolorado-springs-cotrail
05/17/2025Endure Trail Runs10K, 12H, 13.1M, 24HDivide CO05-maydivide-cotrail
05/17/2025Ram Party15K, 24K, 50K, 55M, 60KColorado Springs CO05-maycolorado-springs-cotrail
05/24/2025Weld Your Mettle Running Event12H, 24H, 3H, 6H, 9HEaton CO05-mayeaton-coroadrace
05/31/2025CKF UNBOUND Gravel100M, 200MAspen CO05-mayaspen-coroadrace
05/31/2025North Fork Trail 50 Mile/50K50K, 50MBuffalo Creek CO05-maybuffalo-creek-cotrail
06/07/2025Maceโ€™s Hideout 100100M, 50MBeulah CO06-junebeulah-cotrail
06/07/2025The Great Divide Ultra100K, 100M, 25K, 50KDivide CO06-junedivide-cotrail
06/14/2025Barr Lake13.1M, 15K, 30K, 50K, 5KBrighton CO06-junebrighton-coroadrace
06/21/2025Red, White and Brew10K, 12H, 13.1M, 5KWindsor CO06-junewindsor-coroadrace
06/21/2025Ring the Springs100K, 30K, 50KColorado Springs CO06-junecolorado-springs-cotrail
07/11/2025Silverheels Trail Runs100K, 100M, 10M, 18M, 50M, 60KComo CO07-julycomo-cotrail
07/18/2025High Lonesome100MNathrop CO07-julynathrop-cotrail
07/18/2025Ouray 100 Mile Endurance Run100MOuray CO07-julyouray-cotrail
07/19/2025Silverton Alpine Marathons26.2M, 50M, 8MSilverton CO07-julysilverton-cotrail
07/27/2025World Championship Pack Burro Race15M, 29MFairplay CO07-julyfairplay-coroadrace
08/01/2025Annual Wild West Relay200MFort Collins CO08-augustfort-collins-coroadrace
08/02/2025Sheep Mountain Trail Runs13.1M, 50K, 50MFairplay CO08-augustfairplay-cotrail
08/16/2025CKF Leadville Trail 100 Run100MAspen CO08-augustaspen-cotrail
08/23/2025Continental Divide Trail Run16M, 50K, 5MSteamboat Springs CO08-auguststeamboat-springs-cotrail
08/30/2025Creede Mountain Run12M, 22M, 2M, 50KCreede CO08-augustcreede-cotrail
08/30/2025Grand Traverse Mountain Run40MCrested Butte CO08-augustcrested-butte-cotrail
09/05/2025American Heroes Run100M, 13.1M, 24H, 26.2M, 5K, 9.11M, 9HLongmont CO09-septemberlongmont-coroadrace
09/05/2025Flaming Foliage Relay – Idaho Springs to Buena Vista165MIdaho Springs CO09-septemberidaho-springs-cotrail
09/06/2025Devil on the Divide22K, 50KEmpire CO09-septemberempire-cotrail
09/06/2025The Gunni Grinder120M, 30M, 60MGunnison CO09-septembergunnison-coco gunnison trail
09/12/2025Run Rabbit Run100M, 50MSteamboat Springs CO09-septembersteamboat-springs-cotrail
09/13/2025Snow Mountain Ranch Trail Festival10K, 13.1M, 33K, 50K, 5KGranby CO09-septembergranby-cotrail
09/20/2025Battle by the Brook20M, 6MDeckers CO09-septemberdeckers-cotrail
09/26/2025Red Feather Trail Jamboree13.1M, 50K, 50MRed Feather Lakes CO09-septemberred-feather-lakes-cotrail
09/27/2025West Line Winder 50K30K, 50KBuena Vista CO09-septemberbuena-vista-cotrail
09/27/2025Sangre de Cristo Ultras100K, 100M, 27K, 50K, 50M, 8MWestcliffe CO09-septemberwestcliffe-cotrail
09/27/2025Sangre de Cristo Trail Festival100K, 100M, 27K, 50K, 50M, 8MWestcliffe CO09-septemberwestcliffe-cotrail
09/27/2025Crested Butte Ultra35K, 50M, 55KCrested Butte CO09-septembercrested-butte-cotrail
09/27/202524 Hours of Palmer Lake24HPalmer Lake CO09-septemberpalmer-lake-cotrail
09/28/2025Sawatch Ascent 50K50KNathrop CO09-septembernathrop-cotrail
10/04/2025Bear Chase Race – Half Marathon100K, 10K, 13.1M, 50K, 50MLakewood CO10-octoberlakewood-cotrail
10/04/2025Hanging Flume 50K50KUravan CO10-octoberuravan-cotrail
10/04/2025Above the Clouds Ultra10K, 50KWoodland Park CO10-octoberwoodland-park-cotrail
10/11/2025Sage Burner Trail Race15K, 28K, 50KGunnison CO10-octobergunnison-cotrail
10/18/2025Indian Creek Fifties15M, 50M, 55K, 5MSedalia CO10-octobersedalia-cotrail
10/18/2025Indian Creek Trail Runs15M, 50M, 55K, 5MSedalia CO10-octobersedalia-cotrail
10/25/2025Bridge Burner Ultra10K, 35K, 35M, 50KCaรฑon City CO10-octobercanon-city-cotrail
11/01/2025Colorado 24 Hour Run12H, 24H, 6HFort Collins CO11-novemberfort-collins-cotrail
11/08/2025Kessel Run Ultra10M, 20M, 40M, 50K, 50MFruita CO11-novemberfruita-cotrail
11/08/2025BINGO! Trail Runs10M, 20M, 42M, 54MByers CO11-novemberbyers-cotrail

Colorado Race Calendar

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