Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 99 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

May 2025
May
3
Saturday

Falcon 50 - Colorado Springs

Trail Run 13 mi 26 mi 50 mi
May
3
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
May
3
Saturday

The Best Races - Centennial

13 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

Valkyrie Trail Race

Trail Run 4 mi 8 mi ... 26 mi 50 km
May
10-11
Sa - Su

Adventure Fest at 18 Road

Trail Run 13 mi 22 km 50 km
May
10
Saturday

Mountain Ridge Trail Race

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

Carbon Valley Half Marathon

5 km 13 mi
May
10
Saturday

Donot Stop Half Marathon - Denver

5 km 10 km 13 mi
May
11
Sunday

Fruita Trail Half Marathon

Trail Run 13 mi
May
11
Sunday

Donot Stop Half Marathon - Colorado Springs

5 km 10 km 13 mi
May
17-18
Sa - Su

Endure Trail Runs

Backyard Ultra 10 km 13 mi 12 hr 24 hr
May
17-18
Sa - Su

Denver Colfax Marathon

5 mi 10 mi 13 mi 26 mi
May
17
Saturday

Vallecito Lake Heavy Half

Trail Run 13 mi
May
17-18
Sa - Su

Growing Home - Colfax Fundraiser

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
1
Sunday

Colorado 13er Half Marathon

5 km 10 km 13 mi
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