Colorado Trail Running Calendar 2025-2026

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Explore the best trail runs in Colorado for 2025-2026! Our updated list features 318 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

June 2025
Jun
21
Saturday

Red, White and Brew Half Marathon

5 km 10 km 13 mi 12 hr
Jun
21
Saturday

Howelsen Hill Trail Run

Trail Run 4 mi 8 mi
Jun
21
Saturday

Ring the Springs

Trail Run 30 km 50 km 100 km
Jun
21
Saturday

Unicorn 5k - Thornton

5 km
Jun
22
Sunday

Hometown Half Marathon - Colorado Springs

5 km 10 km 13 mi
Jun
28
Saturday

Timberview Trail Run

Trail Run 5 km 5 mi 10 mi
Jun
28
Saturday

Leadville Trail Marathon and Heavy Half

Trail Run 15 mi 26 mi
Jun
28
Saturday

The John Cappis

Trail Run 50 km
Jun
28
Saturday

Slacker Half Marathon

4 mi 13 mi
Jun
28
Saturday

Denver Pride 5K

5 km
Jun
29
Sunday

Boulder Sunrise Run

5 km 10 km
July 2025
Jul
4
Friday

HRCA Independence Day 5K

5 km
Jul
4
Friday

Newbie to 5K

5 km
Jul
4
Friday

Let Freedom Run 10k

5 km 10 km
Jul
4
Friday

Greeley Freedom 5k

5 km
Jul
5
Saturday

Hahns Peak Vertical Trail Race

Trail Run 8 mi
Jul
5
Saturday

Vail Hillclimb

Trail Run
Jul
10-13
Th - Su

Race in the Clouds Dirt Festival

Trail Run 10 km 7 mi 12 mi 13 mi
Jul
11-12
Fr - Sa

Silverheels Trail Runs

Trail Run 10 mi 19 mi ... 100 km 100 mi
Jul
11
Friday

Hardrock 100

Trail Run 100 mi
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