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Colorado Trail Running Calendar 2026-2027

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Monthly updates for Colorado

Get new running races (and updates) in your inbox every month.

Explore the best trail runs in Colorado for 2026-2027! Our updated list features 131 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

October 2026
Oct
4
Su

Rubey Rescue Run

Trail Run 3 mi
Oct
17
Sa

Indian Creek Trail Runs

Trail Run 5 mi 15 mi 55 km 50 mi
Oct
17
Sa

Bobcat Trail Race

Trail Run 5 km 10 km 25 km 50 km
Oct
17-18
Sa - Su

Blue Sky Trail Marathon

Trail Run 13 mi 27 mi
Oct
17
Sa

The Great Trailhead Foot Race 10 Miler

Trail Run 5 mi 10 mi
Oct
24
Sa

Beware The Bear Trail Races

Trail Run 5 km 15 km 20 km
November 2026
Nov
7
Sa

Kessel Run Ultra

Trail Run 10 mi 20 mi ... 40 mi 50 mi
Nov
7
Sa

HRCA Backcountry Wilderness Half Marathon

Trail Run 13 mi
Nov
14
Sa

Louisville Trail Race

Trail Run 3 mi 6 mi 13 mi
Nov
21
Sa

Colorado Cold Rush Ultra

Trail Run 10 km Half Marathon 50 km
December 2026
Dec
5
Sa

Sawmill Trail Runs

Trail Run 8 mi 16 mi 50 km