Upcoming ultra marathons in Colorado. Use filters to quickly find races by month, city or race type.
More races:ย USA running calendar
Date Race Distance Location hf:tax:monthandyear hf:tax:city hf:tax:typerace 02/15/2025 Stories Ultra 10K, 13.1M, 15H, 30H, 6H Colorado Springs CO 02-february colorado-springs-co trail 04/11/2025 Desert RATS Trail Running Festival 100K, 10K, 13.1M, 50K Fruita CO 04-april fruita-co trail 04/26/2025 Runs with Scissors Races 13.1M, 26.2M, 50K Brighton CO 04-april brighton-co trail 04/26/2025 Royal Gorge Groove Trail Runs 12K, 20K, 30K, 50K, 5K Caรฑon City CO 04-april canon-city-co trail 05/10/2025 Valkyrie Trail Race 13.1M, 26.2M, 30K, 4M, 50K, 8M Colorado Springs CO 05-may colorado-springs-co trail 05/17/2025 Endure Trail Runs 10K, 12H, 13.1M, 24H Divide CO 05-may divide-co trail 05/17/2025 Ram Party 15K, 24K, 50K, 55M, 60K Colorado Springs CO 05-may colorado-springs-co trail 05/24/2025 Weld Your Mettle Running Event 12H, 24H, 3H, 6H, 9H Eaton CO 05-may eaton-co roadrace 06/07/2025 The Great Divide Ultra 100K, 100M, 25K, 50K Divide CO 06-june divide-co trail 07/11/2025 Silverheels Trail Runs 100K, 100M, 10M, 18M, 50M, 60K Como CO 07-july como-co trail 07/18/2025 Ouray 100 Mile Endurance Run 100M Ouray CO 07-july ouray-co trail 08/01/2025 Annual Wild West Relay 200M Fort Collins CO 08-august fort-collins-co roadrace
