Colorado Trail Running Calendar 2025-2026

Header image

Explore the best trail runs in Colorado for 2025-2026! Our updated list features 262 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

September 2026
Sep
12
Saturday

The Denver 5k

5 km
Sep
13
Sunday

Nun Run

5 km Half Marathon
Sep
18-19
Fr - Sa

Run Rabbit Run

Trail Run 50 mi 100 mi
Sep
19
Saturday

Valkyrie Relay - Durango

Multisport
Sep
19
Saturday

Ouray Mountain Trail Run

Trail Run 13 mi
Sep
19
Saturday

All-Out Fall Fest

5 km 10 km Half Marathon
Sep
19
Saturday

Run the Rockies Road Half Marathon

6 mi 13 mi
Sep
19
Saturday

Autumn Run - Buena Vista, CO

5 km 10 km Half Marathon
Sep
19
Saturday

Valkyrie Ultra Heptathlon

Multisport
Sep
19-20
Sa - Su

Pikes Peak Marathon

Trail Run 13 mi 26 mi
Sep
19-20
Sa - Su

Pikes Peak Ascent

Trail Run 13 mi 26 mi
Sep
25-28
Fr - Mo

Red Feather Trail Jamboree

Trail Run Half Marathon 50 km 50 mi
Sep
26-27
Sa - Su

Sangre de Cristo Trail Festival

Trail Run 8 mi 27 km ... 100 km 100 mi
Sep
26
Saturday

Crested Butte Ultra

Trail Run 35 km 55 km 50 mi
Sep
26
Saturday

West Line Winder

Trail Run 30 km 50 km
Sep
26-27
Sa - Su

Tough Mudder - Colorado

Obstacle Run 5 km 15 km
Sep
26
Saturday

24 Hours Of Palmer Lake

Trail Run
Sep
27
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
Sep
27
Sunday

ÖTILLÖ Colorado USA

Aquathlon
October 2026
Oct
3
Saturday

Colorado Springs Marathon

5 km Half Marathon Marathon
Articles
Top 10 Marathons in the Netherlands — The Ultimate Dutch Marathon Bucket List: 10 Unmissable Races
The Beauty of the Easy Run — Why slowing down might be the smartest thing you do for your running
Mizuno Wave Rider 28: Elevating the Legacy of a Running Icon
Garmin Forerunner Review: Garmin Forerunner Series