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Colorado Running Calendar 2025-2026

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Explore the best running races in Colorado for 2025-2026! Our updated list features 272 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

Half Marathons Marathons Trail Runs Triathlons
June 2026
Jun
7
Sunday

Colorado 13er Half Marathon

5 km 10 km 13 mi
Jun
13
Saturday

Ironman 70.3 Boulder

Triathlon
Jun
13
Saturday

All-Out Summer Breeze

5 km 10 km Half Marathon
Jun
13
Saturday

Barr Lake Trail Race

Trail Run 3 mi 9 mi ... 18 mi 32 mi
Jun
14
Sunday

Bodies Race Company - Colorado Springs

5 km 10 km Half Marathon
Jun
20
Saturday

Unicorn 5k - Thornton

5 km
Jun
20
Saturday

Red, White and Brew Half Marathon

5 km 10 km Half Marathon
Jun
20
Saturday

San Juan Solstice 50 Mile

Trail Run 50 mi
Jun
20
Saturday

Ring the Springs

Trail Run 35 km 50 km 100 km
Jun
20
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jun
21
Sunday

Father's Day Classic 10k

5 km 10 km
Jun
27
Saturday

The John Cappis

Trail Run 50 km
Jun
27
Saturday

Timberview Trail Run

Trail Run 5 km 5 mi 10 mi
Jun
27
Saturday

Race in the Clouds - Alma Dirt Festival

Trail Run 6 mi 13 mi
Jun
27
Saturday

Leadville Trail Marathon and Heavy Half

Trail Run 15 mi 26 mi
Jun
27-28
Sa - Su

Chase the Moon

Backyard Ultra 10 mi 31 mi
July 2026
Jul
4
Saturday

Palmer Lake 4M

4 mi
Jul
4
Saturday

Let Freedom Run 10k - Louisville

5 km 10 km
Jul
4
Saturday

The Best Races - Centennial

5 km 10 km 13 mi
Jul
4
Saturday

Let Freedom Run 5k - Longmont

5 km
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