Colorado Running calendar 2025-2026

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Explore the best running races in Colorado for 2025-2026! Our updated list features 338 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

September 2025
Sep
7
Sunday

Conservation Colorado 5k

5 km
Sep
7
Sunday

RMRR Trophy Series

5 km 10 km
Sep
12-13
Fr - Sa

Run Rabbit Run

Trail Run 50 mi 100 mi
Sep
12-14
Fr - Su

Breckenridge Oktoberfest 5K

Trail Run 5 km
Sep
13
Saturday

All-Out Fall Fest

5 km 10 km 13 mi
Sep
13
Saturday

Spooky Sprint - Colorado Springs

5 km 10 km 13 mi
Sep
13
Saturday

The Denver 5k

5 km
Sep
13
Saturday

Snow Mountain Ranch

Trail Run 5 km 10 km ... 33 km 50 km
Sep
13
Saturday

Parker Parks and Recreation so Long to Summer

5 km 10 km
Sep
13
Saturday

So Long to Summer 10K

5 km 10 km
Sep
13
Saturday

Meadowgold 5k &10k

Trail Run 5 km 11 km
Sep
13
Saturday

Ned Ned Half Marathon

Trail Run 5 km 10 km 13 mi
Sep
13-14
Sa - Su

Ouray 50 Mile Endurance Run

Trail Run 50 mi
Sep
13
Saturday

Blisters & Brews Telluride 5k

Trail Run 5 km
Sep
13
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Sep
14
Sunday

Spooky Sprint - Denver

5 km 10 km 13 mi
Sep
14
Sunday

Nun Run

5 km 13 mi
Sep
14
Sunday

Fall Equinox Marathon

5 mi 13 mi 26 mi
Sep
14
Sunday

Pony Express Trail Run

Trail Run 8 mi 16 mi
Sep
20
Saturday

Miles 4 Madison 5K

5 km
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