Colorado Running Calendar 2025-2026

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Explore the best running races in Colorado for 2025-2026! Our updated list features 269 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

May 2026
May
3
Sunday

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
3
Sunday

The Pilgrimage

Trail Run 6 mi 11 mi 12 mi
May
9
Saturday

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
10
Sunday

Colorado Women's Classic

5 km 10 km 10 mi
May
16
Saturday

Endure Trail Runs

Backyard Ultra 10 km 13 mi 26 mi 12 hr
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
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