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Upcoming Half Marathons Near Denver, CO

Looking for a half marathon in Denver, Colorado? Browse the most comprehensive Denver half marathon calendar with each race history, course description, difficulty rating, finisher ranges, scenery, and what the race is perfect for like family-friendly or lots of crowd support.

You’ll also be able to find must-know race logistics like pricing, start time, and course maps.

Half marathons are always coming and going. If you don’t see a race on the Denver half marathon calendar, you can contact us at [email protected].

Valkyrie Trail Race Half Marathon course in Colorado Springs, CO

Filter Colorado Half Marathons

Filter Colorado Half Marathons

Colorado Brewery Running Series Logo
July 6, 2025
100-500 runners
Wheat Ridge, Colorado
Boulder Rez Marathon logo
August 2, 2025
100-500 runners
Boulder, Colorado
I'm Bound for Boston Marathon & Half Marathon - Denver Logo
August 3, 2025
100-500 runners
Denver, Colorado
10K Turkey Trek & 5K Turkey Trot Logo
November 22, 2025
100-500 runners
Arvada, Colorado
All-Out Polar Prowl logo
January 10, 2026
100-500 runners
Arvada, Colorado

Running in Colorado

FAQ

What are the most popular Colorado half marathons?

The four most popular Colorado half marathons are the Denver Colfax Half Marathon, the REVEL Rockies Half Marathon, the Horsetooth Half Marathon, and Boulderthon.

What’s the best half marathons in Colorado for beginners in 2025?

We have three picks for the best beginner Colorado half marathons. The first is the Slacker Half Marathon for it’s fun fast downhill course. Secondly, Boulderthon, for it’s scenic course, huge crowds, and amazing production quality. And finally, the Denver Colfax Half Marathon for it’s notable and exciting course and race experience.

Which months can I run a half marathon in Colorado?

You can run a half marathon in Colorado in January, February, April, May, June, July, August, September, October, November, and December.

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