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Colorado Half Marathon Calendar 2024-2025

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Explore the best half marathons in Colorado for 2024-2025! Our updated list features 73 exciting races across the state. Find your next race in Colorado below and join the running community at these great events!

April 2025
Apr
13
Sunday

Platte River Half-Marathon

13 mi
Apr
13
Sunday

Horsetooth Half Marathon

13 mi
Apr
19
Saturday

All-Out Beat the Heat

5 km 10 km 21 km
Apr
26
Saturday

Runs With Scissors Races

21 km 42 km 50 km
Apr
26
Saturday

Bigfoot Half Marathon

5 km 13 mi
May 2025
May
4
Sunday

Longmont Half

5 km 13 mi
May
4
Sunday

Colorado Marathon

5 km 10 km 13 mi 26 mi
May
10
Saturday

Mountain Ridge Trail Race

Trail Run 5 km 10 km 13 mi 21 mi
May
10
Saturday

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
10
Saturday

Donot Stop Half Marathon - Denver

5 km 10 km 13 mi
May
10-11
Sa - Su

Adventure Fest at 18 Road

Trail Run 21 km 22 km 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
17-18
Sa - Su

Endure Trail Runs

Backyard Ultra 10 km 21 km 12 hr 24 hr
May
17-18
Sa - Su

Denver Colfax Marathon

5 km 10 mi 13 mi 26 mi
May
25
Sunday

Spirit Trail Run

Trail Run 9 km 13 mi 26 mi
May - Jun
31-1
Sa - Su

Colorado Springs Spartan Event Weekend

Obstacle Run 5 km 10 km 21 km 50 km
June 2025
Jun
1
Sunday

Steamboat Marathon

10 km 13 mi 26 mi
Jun
7
Saturday

All-Out Summer Breeze

5 km 10 km 21 km
Jun
14
Saturday

Barr Lake Trail Race

Trail Run 5 km 15 km ... 30 km 50 km