Colorado Trail Running Calendar 2025-2026

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Explore the best trail runs in Colorado for 2025-2026! Our updated list features 339 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

June 2025
Jun
15
Sunday

Too Hot to Trot 5K

5 km
Jun
21
Saturday

Estes Park's Backyard Ultra

Backyard Ultra 4 mi
Jun
21
Saturday

Hometown Half Marathon - Denver

5 km 10 km 13 mi
Jun
21
Saturday

San Juan Solstice 50 Mile

Trail Run 50 mi
Jun
21
Saturday

Xterra Lory

Cross Triathlon
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 35 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
22
Sunday

Sunset Trail Running Festival

Trail Run 5 km 12 km 28 km
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
29
Sunday

Boulder Sunrise Run

5 km 10 km
July 2025
Jul
4
Friday

HRCA Independence Day 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
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