Colorado Ultra Races
Upcoming ultra races in Colorado, sorted by date.
Dec 2026
Dec1Tue
Move through the Darkness Challenge
Virtual
400 Miles200 Miles100 Milesregistration closed
Dec5Sat
Sawmill Trail Runs
Pine, CO · from $80
32.2 Miles16.38 Miles8.17 Miles
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Jan 2027
Jan1Fri
Mission Crew Miles
Virtual · from $37
27 Miles
Jan9Sat
BINGO! Trail Runs
Lakewood, CO
28 Miles16 Miles8 Milesregistration closed
Mar 2027
Apr 2027
May 2027
May1Sat
Greenland Trail Races
Larkspur, CO · Virtual option · from $35
50K25K8 Miles4 Miles
May15Sat
Endure Trail Runs
Divide, CO
26.53 Miles14.12 Miles6.81 Milesregistration closed
May22Sat
Samson's Revenge
Estes Park, CO
50K25K10.45Kregistration closed
Jun 2027
Jun5Sat
Weld Your Mettle Running Festival
Eaton, CO · Virtual option · from $45
200 Miles100K50 Miles50K26.2 Miles
Jun12Sat
Summits Trail Runs
Granby, CO
33.9 Miles27.8 Miles13.9 Miles6.1 Milesregistration closed
Jul 2027
Aug 2027
Sep 2027
Oct 2027
Race listings come from RunSignup. Dates, prices and details can change, so confirm on the race's registration page.