Colorado Trail Running Calendar 2025-2026

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Explore the best trail runs in Colorado for 2025-2026! Our updated list features 284 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

May 2026
May
16-17
Sa - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
May
30-31
Sa - Su

Colorado Springs Spartan Trifecta Weekend

Obstacle Run 5 km 10 km 21 km 50 km
June 2026
Jun
6
Saturday

J-Town Jog 5K

5 km
Jun
7
Sunday

Flamingo Day 5K

5 km
Jun
7
Sunday

Steamboat Marathon

10 km 13 mi 26 mi
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