Colorado Running calendar 2024-2025

Explore the best running races in Colorado for 2024-2025! Our updated list features 130 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

April 2025
Apr
26
Saturday

Royal Gorge Groove

Trail Run 5 km 12 km ... 30 km 50 km
Apr
26
Saturday

Runs With Scissors Races

13 mi 26 mi 50 km
Apr
26
Saturday

Bigfoot Half Marathon

5 km 13 mi
May 2025
May
3
Saturday

Take 5 in The Garden

Trail Run 5 km 5 mi
May
3
Saturday

Greenland Trail Races

Trail Run 4 mi 8 mi 25 km 50 km
May
3
Saturday

Collegiate Peaks Trail Run

Trail Run 25 mi 50 mi
May
4
Sunday

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
4
Sunday

Longmont Half

5 km 13 mi
May
10
Saturday

Niwot's Challenge

Trail Run 24 mi 50 mi 100 mi
May
10-11
Sa - Su

Adventure Fest at 18 Road

Trail Run 21 km 22 km 50 km
May
10
Saturday

Donot Stop Half Marathon - Denver

5 km 10 km 13 mi
May
10
Saturday

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
11
Sunday

Donot Stop Half Marathon - Colorado Springs

5 km 10 km 13 mi
May
11
Sunday

Fruita Trail Half

Trail Run 13 mi
May
17
Saturday

Ram Party Trail Runs

Trail Run 15 km 24 km ... 60 km 55 mi
May
17-18
Sa - Su

Endure Trail Runs

Backyard Ultra 10 km 13 mi 12 hr 24 hr
May
17
Saturday

Sky Pilots Ouray Backyard Ultra

Backyard Ultra 4 mi
May
17
Saturday

Samson's Revenge

Trail Run 10 km 27 km 55 km
May
17-18
Sa - Su

Denver Colfax Marathon

10 mi 13 mi 26 mi
May
24
Saturday

The Ol' College Try 24 Hour Ultra

Backyard Ultra 6 hr 12 hr 24 hr