Colorado Half Marathon Calendar 2025-2026

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Explore the best half marathons in Colorado for 2025-2026! Our updated list features 96 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

June 2025
Jun
14
Saturday

Estes Park Marathon

5 mi 13 mi 26 mi
Jun
14
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Jun
14
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jun
21
Saturday

Hometown Half Marathon - Denver

5 km 10 km 13 mi
Jun
21
Saturday

Red, White and Brew Half Marathon

5 km 10 km 13 mi 12 hr
Jun
22
Sunday

Hometown Half Marathon - Colorado Springs

5 km 10 km 13 mi
Jun
28
Saturday

Slacker Half Marathon

4 mi 13 mi
July 2025
Jul
5
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Jul
5
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jul
10-13
Th - Su

Race in the Clouds Dirt Festival

Trail Run 10 km 7 mi 13 mi
Jul
12
Saturday

All-Out Dog Days

5 km 10 km 13 mi
Jul
19
Saturday

Aspen Valley Marathon

5 km 13 mi 26 mi
Jul
19
Saturday

Summer Splash Prairie Dog Half

5 km 10 km 13 mi
August 2025
Aug
1-2
Fr - Sa

Rocky Mountain Half Marathon

5 km 13 mi
Aug
2
Saturday

Sheep Mountain Ultras

Trail Run 13 mi 50 km 50 mi
Aug
2
Saturday

All-Out Runapalooza

5 km 10 km 13 mi
Aug
2
Saturday

Boulder Rez Marathon

Trail Run 10 km 13 mi 31 km 26 mi
Aug
2-3
Sa - Su

Emerald Mountain Epic

Trail Run 13 mi 26 mi
Aug
2
Saturday

The Best Races - Aurora

5 km 10 km 13 mi
Aug
2
Saturday

Aspen Backcountry Marathon

Trail Run 13 mi 26 mi 50 km
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