Colorado Trail Running Calendar 2025-2026

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Explore the best trail runs in Colorado for 2025-2026! Our updated list features 284 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

December 2025
Dec
31
Wednesday

Resolution Run - Fort Collins

5 km
January 2026
Jan
1
Thursday

Resolute Runner 5k

5 km
Jan
3
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jan
10
Saturday

Polar Prowl

5 km 10 km 13 mi
Jan
17
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jan
18
Sunday

Arctic Prairie Dog Half Marathon

5 km 10 km 13 mi
Jan
24-25
Sa - Su

USCSA Cross Country Ski Racing Festival

Trail Run 3 km 7 km 15 km
February 2026
Feb
7
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Feb
8
Sunday

Super Half Marathon

5 km 13 mi
Feb
14
Saturday

Heart Throb 5K

5 km
Feb
14
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Feb
21-22
Sa - Su

Stories Trail Runs

Trail Run 10 km 13 mi ... 15 hr 30 hr
Feb
22
Sunday

Highlands Ranch 5k

5 km
Feb
22
Sunday

Mardi Crawl

5 km 10 km 13 mi
March 2026
Mar
14
Saturday

Run Through Time Trail Marathon

Trail Run 2 mi 13 mi 26 mi
Mar
14
Saturday

Erin Go Bragh 7.77k

7 km
Mar
14
Saturday

Sharin' O' The Green

5 km
Mar
14
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Mar
22
Sunday

Central Park 5k

5 km
Mar
22
Sunday

All-Out Spring Fever

5 km 10 km 13 mi
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