Colorado

Colorado Half Marathon Calendar

Browse all Colorado Half Marathons in 2024-2025 by month and by city below. For each race, you’ll find the history of the half marathon and the course, the most recent year’s course maps, elevation profiles, runner reviews, pricing, and how to sign up.

We dedicate hours every month searching for races to include in the Colorado Half Marathons calendar. If you happen to see any half marathon not included, contact us at [email protected] to submit your race.

Valkyrie Trail Race Half Marathon course in Colorado Springs, CO

Filter Colorado Half Marathons

Filter Colorado Half Marathons

January 19, 2025
100-500 runners
Westminster, Colorado
Super Half Marathon and Game Day 5k logo
February 9, 2025
500-1000 runners
Colorado Springs, Colorado
February 16, 2025
100-500 runners
Arvada, Colorado
February 16, 2025
1-100 runners
Colorado Springs, Colorado
February 22, 2025
1-100 runners
Arvada, Colorado
March 1, 2025
1-100 runners
Morrison, Colorado
March 1, 2025
1-100 runners
Colorado Springs, Colorado
March 8, 2025
100-500 runners
Salida, Colorado
All-Out Spring Fever logo
March 23, 2025
1-100 runners
Golden, Colorado
All-Out Spring Fever logo
March 23, 2025
1-100 runners
Golden, Colorado
March 24, 2025
100-500 runners
Fort Collins, Colorado
April 13, 2025
100-500 runners
Arvada, Colorado
April 13, 2025
500-1000 runners
Littleton, Colorado
April 13, 2025
100-500 runners
Denver, Colorado
April 14, 2025
1-100 runners
Fort Collins, Colorado
All-Out Beat the Heat Marathon Half Marathon 10K & 5K logo
April 19, 2025
1-100 runners
Westminster, Colorado
All-Out Beat the Heat Marathon Half Marathon 10K & 5K logo
April 19, 2025
1-100 runners
Westminster, Colorado
April 26, 2025
1-100 runners
Brighton, Colorado
May 4, 2025
100-500 runners
Longmont, Colorado
May 5, 2025
500-1000 runners
Fort Collins, 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 2024?
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.
What’s the best month to run a half marathon in Colorado?
September and October are the most popular months to run Colorado half marathons.
What are the most popular cities to run Colorado half marathons?
Colorado Springs, Boulder, and Denver are the most popular cities to run a Colorado half marathon in.

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