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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 182 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

April 2026
Apr
4
Sa

Race the Ranch

Trail Run 5 km 25 km 50 km
Apr
9
Th

Desert Rats Trail Running Festival

Trail Run 9 km Half Marathon 48 km 100 km
Apr
10-11
Fr - Sa

Run The Ranch

Trail Run 3 mi 6 mi
Apr
11
Sa

Mountain Ridge Trail Race

Trail Run 5 km 10 km Half Marathon 21 mi
Apr
12
Su

NoCo Urban Ultra

Trail Run 50 mi 100 mi
Apr
18
Sa

Rattler Trail Race

Trail Run 5 km 10 km 25 km 50 km
Apr
18
Sa

Earth Day 5K - Durango

Trail Run 5 km
Apr
18
Sa

Great Western Trail Race

Trail Run 5 km 10 km 13 mi
Apr
25
Sa

Royal Gorge Groove

Trail Run 5 km 13 km ... 30 km 50 km
Apr
25
Sa

Falcon 50 - Colorado Springs

Trail Run 13 mi 26 mi 50 mi
May 2026
May
2
Sa

Greenland Trail Races

Trail Run 4 mi 8 mi 25 km 50 km
May
2-4
Sa - Mo

Niwot's Challenge

Trail Run 24 mi 50 mi 100 mi
May
2
Sa

Take 5 in The Garden

Trail Run 5 km 5 mi 10 mi
May
2
Sa

Collegiate Peaks Trail Run

Trail Run 25 mi 50 mi
May
2
Sa

High Line Canal 10K Run

Trail Run 5 km 10 km
May
3
Su

The Pilgrimage

Trail Run 7 mi 11 mi ... 55 mi 221 mi
May
9
Sa

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... Marathon 50 km
May
9-10
Sa - Su

Adventure Fest at 18 Road

Trail Run 14 mi 50 km
May
9
Sa

Quad Rock 50

Trail Run 25 mi 50 mi
May
9
Sa

The Great CO74 Trail Run

Trail Run 7 mi
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