100 KM Ultra Running Events in Colorado

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

Date	Event	City	Distances
07/24/26	Never Summer	Gould	60 KM , 100 KM
08/22/26	Telluride Mountain Run	Telluride	40 Miles , 100 KM
09/26/26	Sangre de Cristo Trail Festival	Westcliffe	50 KM , 50 Miles , 100 KM , 101.3 Miles
10/03/26	The Bear Chase	Lakewood	50 KM , 50 Miles , 100 KM
04/09/27	Desert Rats Trail Running Festival	Fruita	50 KM , 100 KM
06/05/27	Weld Your Mettle Running Festival	Windsor	36 Hours , 50 KM , 50 Miles , 100 KM , 100 Miles

Date	Event	City	Distances
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
10/18/25	Rabbit Valley Ultras	Mack	50 KM , 100 KM
09/21/24	Silver Creek Mountain Runs (Divide 100)	Georgetown	50 KM , 50 Miles , 100 KM , 100 Miles
09/17/22	Tava's Shadow Ultra	Divide	50 KM , 100 KM
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
10/03/20	Tommyknocker 12-Hour & Mine Shaft Half	Golden	12 Hours , 50 KM , 100 KM
09/02/17	Hideaway Hundred	Winter Park	50 KM , 50 Miles , 100 KM , 100 Miles
04/29/17	The Chatfield Ultra Race - C.U.R.E ultras	Littleton	50 KM , 50 Miles , 100 KM
10/11/14	24 Hours of Boulder	Boulder	6 Hours , 12 Hours , 24 Hours , 50 KM , 100 KM , 100 Miles
09/06/14	Ultra Race of Champions (UROC) - CO	Vail	50 KM , 100 KM
06/14/14	Gunnison 100k Endurance Run	Gunnison	100 KM