100 Miles Ultra Running Events in Colorado

All 50 KM 50 Miles 100 KM 100 Miles 6 Hours 12 Hours 24 Hours

Date	Event	City	Distances
07/25/26	Creede 100	Creede	100 Miles
08/07/26	HighFive100	Lake City	100 Miles
08/14/26	San Juan Softie 100	Durango	100 Miles
08/22/26	Leadville Trail	Leadville	100 Miles
09/03/26	Front Range Ultra Dayze	Loveland	12 Hours , 24 Hours , 48 Hours , 100 Hours , 50 KM , 100 Miles , 200 Miles
09/11/26	American Heroes Run	Longmont	6 Hours , 9 Hours , 24 Hours , 100 Miles
09/18/26	Run Rabbit Run	Steamboat Springs	50 Miles , 100 Miles , 100 Miles
04/11/27	NoCo Urban Ultra and Relay	Greeley	50 Miles , 100 Miles
06/05/27	Weld Your Mettle Running Festival	Windsor	36 Hours , 50 KM , 50 Miles , 100 KM , 100 Miles
07/09/27	Hardrock 100 Endurance Run	Silverton	100 Miles

Date	Event	City	Distances
07/17/26	Ouray 100 Mile Endurance Run	Ouray	100 Miles
07/17/26	High Lonesome 100	Salida	100 Miles
07/11/26	Silverheels Trail Runs	Fairplay	60 KM , 50 Miles , 100 KM , 100 Miles , 100 Miles , 102 Miles , 106.5 Miles
06/20/26	Ring the Springs	Colorado Springs	50 KM , 50 KM , 50 Miles , 100 KM , 100 Miles
06/07/26	The Great Divide Ultra	Divide	50 KM , 100 KM , 100 Miles
06/06/26	Mace’s Hideout 100	Beulah	50 Miles , 100 Miles
08/23/25	Rio Grande 100	South Fork	100 Miles
09/21/24	Silver Creek Mountain Runs (Divide 100)	Georgetown	50 KM , 50 Miles , 100 KM , 100 Miles
08/07/21	Silverton Ultra Dirty	Silverton	60 KM , 100 KM , 100 Miles
07/17/21	Kickers For Kids Fun Run	Palmer Lake	50 KM , 50 Miles , 100 KM , 100 Miles
07/16/21	Mount Herman Adventure Run	Palmer Lake	50 Miles , 100 Miles , 200 Miles
06/19/21	Happy Camper Endurance Run	Westminster	50 Miles , 100 Miles , 150 Miles , 200 Miles
08/01/20	Dinosaur100 Trail Race	Craig	50 Miles , 100 Miles
07/06/18	Steep Camp (Silverton 1000)	Silverton	6 Hours , 12 Hours , 24 Hours , 48 Hours , 72 Hours , 144 Hours , 100 Miles
09/02/17	Hideaway Hundred	Winter Park	50 KM , 50 Miles , 100 KM , 100 Miles
10/11/14	24 Hours of Boulder	Boulder	6 Hours , 12 Hours , 24 Hours , 50 KM , 100 KM , 100 Miles