Colorado Half Marathon Calendar 2025-2026

Header image

Explore the best half marathons in Colorado for 2025-2026! Our updated list features 84 exciting races across the region. Find your next race in Colorado below and join the running community at these great events!

September 2026
Sep
19-20
Sa - Su

Pikes Peak Ascent

Trail Run 13 mi 26 mi
Sep
25-28
Fr - Mo

Red Feather Trail Jamboree

Trail Run Half Marathon 50 km 50 mi
Sep
27
Sunday

Run Boulderthon: The Boulder Marathon

5 km 10 km Half Marathon Marathon
October 2026
Oct
3
Saturday

Colorado Springs Marathon

5 km Half Marathon Marathon
Articles
Top 10 Marathons in the Netherlands — The Ultimate Dutch Marathon Bucket List: 10 Unmissable Races
The Beauty of the Easy Run — Why slowing down might be the smartest thing you do for your running
Mizuno Wave Rider 28: Elevating the Legacy of a Running Icon
Garmin Forerunner Review: Garmin Forerunner Series