2017 - 2018 Colorado Ultramarathon Calendar

Browse our Ultramarathon Calendar for races organized in Colorado among 58 races.

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58 races

Frozen Dead Guy 50km

January 21, 2017 Race day in 3 days
USA / Mountain Region / Colorado / Nederland
Ultramarathon - 50 kilometers
Trail Mountain Snow

High Line Canal 100K

March 18, 2017 Race day in about 2 months
USA / Mountain Region / Colorado / Littleton
Ultramarathon - 100 kilometers
Flat

Desert R.A.T.S. Trail Running Festival

50K
April 15, 2017 Race day in 3 months
USA / Mountain Region / Colorado / Fruita
Ultramarathon - 50 kilometers
Hilly Desert Trail

Rattler Trail Races

Rattler Trail Races 50K
April 15, 2017 Race day in 3 months
USA / Mountain Region / Colorado / Colorado Springs
Ultramarathon - 50 kilometers
Trail

C.U.R.E Ultra's

100K
April 29, 2017 Race day in 3 months
USA / Mountain Region / Colorado / Chatfield State Park, Littleton
Ultramarathon - 100 kilometers
Trail

C.U.R.E Ultra's

50K
April 29, 2017 Race day in 3 months
USA / Mountain Region / Colorado / Chatfield State Park, Littleton
Ultramarathon - 50 kilometers
Trail

C.U.R.E Ultra's

50 Mile
April 29, 2017 Race day in 3 months
USA / Mountain Region / Colorado / Chatfield State Park, Littleton
Ultramarathon - 50 miles
Trail

Greenland Trail 50k

Greenland Trail 50k
May 06, 2017 Race day in 4 months
USA / Mountain Region / Colorado / Larkspur
Ultramarathon - 50 kilometers
Trail Fast

North Fork 50 Mile/50K Trail Race

50K Trail Race
June 03, 2017 Race day in 5 months
USA / Mountain Region / Colorado / Pine Valley Ranch Park, Pine
Ultramarathon - 50 kilometers
Trail Mountain

North Fork 50 Mile/50K Trail Race

50 Mile Trail Race
June 03, 2017 Race day in 5 months
USA / Mountain Region / Colorado / Pine Valley Ranch Park, Pine
Ultramarathon - 50 miles
Trail Mountain

South Park Trail Marathon and Half

South Park Trail Marathon
June 10, 2017 Race day in 5 months
USA / Mountain Region / Colorado / Fairplay
Ultramarathon - 28 miles
Trail

Leadville Silver Rush 50

July 09, 2017 Race day in 6 months
USA / Mountain Region / Colorado / Leadville
Ultramarathon - 50 miles
Trail Mountain

Hardrock 100 Endurance Run

July 14, 2017 Race day in 6 months
USA / Mountain Region / Colorado / Silverton
Ultramarathon - 100 miles
UTMB Qualifier Trail Mountain

Pike Peak Ultra

50 Mile
July 29, 2017 Race day in 6 months
USA / Mountain Region / Colorado / Colorado Springs
Ultramarathon - 50 miles
Trail Mountain

Wild West Relay

August 04, 2017 Race day in 7 months
USA / Mountain Region / Colorado / Fort Collins
Ultramarathon - 200 miles
Road Running RLT Relay Races Relay