2018 - 2019 Colorado Ultramarathon Calendar

Browse our Ultramarathon Calendar for races organized in Colorado among 54 races.

54 races

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

50K
04/14/2018 - 07:00
North America / USA / Mountain Region / Colorado / Fruita
Ultramarathon
Desert Trail Running Hilly

Greenland Trail 50k

Greenland Trail 50k
05/05/2018 - 07:00
North America / USA / Mountain Region / Colorado / Larkspur
Ultramarathon
Trail Running

North Fork 50 Mile/50K Trail Race

50 Mile Trail Race
06/02/2018 - 07:00
North America / USA / Mountain Region / Colorado / Pine Valley Ranch Park, Pine
Ultramarathon
Mountain Trail Running Mountain

North Fork 50 Mile/50K Trail Race

50K Trail Race
06/02/2018 - 07:00
North America / USA / Mountain Region / Colorado / Pine Valley Ranch Park, Pine
Ultramarathon
Mountain Trail Running Mountain

John Cappis 50K Fat Ass

07/07/2018 - 05:00
North America / USA / Mountain Region / Colorado / Silverton
Ultramarathon
Trail Running Mountain

Run Rabbit Run 50 & 100 Mile UltraMarathons

Run Rabbit Run 100 Mile Ultra Marathon
09/14/2018 - 08:00
North America / USA / Mountain Region / Colorado / Steamboat Springs
Ultramarathon
Mountain UTMB Qualifier Western States Qualifier Trail Running Mountain

Mountain RATS

50K
09/22/2018 - 07:30
North America / USA / Mountain Region / Colorado / Eagle
Ultramarathon
Mountain Trail Running Mountain

Castle Rock Trail Festival

50K Trail Race
10/06/2018 - 08:00
North America / USA / Mountain Region / Colorado / Castle Rock
Ultramarathon
Trail Running

Sawmill 17 & 55K+

Sawmill 55K+
12/08/2018
North America / USA / Mountain Region / Colorado / Golden
Ultramarathon
Trail Running Mountain Solo

Continental Divide Trail Run

50K
08/27/2016
North America / USA / Mountain Region / Colorado / Steamboat Springs
Ultramarathon
Trail Running

Hideaway Hundred

Hideaway Hundred 50 Miler
09/03/2016 - 06:00
North America / USA / Mountain Region / Colorado / Winter Park
Ultramarathon
Mountain Trail Running Mountain

Hideaway Hundred

Hideaway Hundred 50K
09/03/2016 - 06:00
North America / USA / Mountain Region / Colorado / Winter Park
Ultramarathon
Mountain Trail Running Mountain
Refine by