Colorado Springs, Boulder, and Denver are the most popular cities to run a Colorado half marathon in.
Colorado Half Marathon Calendar
Browse all Colorado Half Marathons in 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.
Filter Colorado Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
Filter Colorado Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
Featured Race
May 17, 2025
1,000-10,000 runners
Denver, Colorado
- Half Marathon, Marathon, Road
Featured Race
June 7, 2025
500-1000 runners
Provo, Arizona
- 10K, Half Marathon, Marathon, Road
February 9, 2025
500-1000 runners
Colorado Springs, Colorado
- 5k, Half Marathon, Trail
February 16, 2025
1-100 runners
Colorado Springs, Colorado
- 10K, Half Marathon, Trail
February 16, 2025
100-500 runners
Arvada, Colorado
- 5k, Half Marathon, Road
February 22, 2025
1-100 runners
Arvada, Colorado
- 10K, 5k, Half Marathon, Road
March 1, 2025
1-100 runners
Colorado Springs, Colorado
- 10K, 5k, Half Marathon, Trail
March 1, 2025
1-100 runners
Morrison, Colorado
- 10K, 5k, Half Marathon, Trail
March 8, 2025
100-500 runners
Salida, Colorado
- Half Marathon, Marathon, Trail
March 23, 2025
1-100 runners
Golden, Colorado
- 10K, 5k, Half Marathon, Road
March 23, 2025
1-100 runners
Golden, Colorado
- 10K, 5k, Half Marathon, Trail
March 24, 2025
100-500 runners
Fort Collins, Colorado
- Half Marathon, Road
April 13, 2025
100-500 runners
Denver, Colorado
- Half Marathon, Trail
April 13, 2025
100-500 runners
Arvada, Colorado
- 10K, 5k, Half Marathon, Trail
April 13, 2025
500-1000 runners
Littleton, Colorado
- Half Marathon, Trail
April 14, 2025
1-100 runners
Fort Collins, Colorado
- Half Marathon, Trail
April 19, 2025
1-100 runners
Westminster, Colorado
- 10K, 5k, Half Marathon, Road
April 19, 2025
1-100 runners
Westminster, Colorado
- 10K, 5k, Half Marathon, Marathon, Trail & Road
April 26, 2025
1-100 runners
Brighton, Colorado
- Half Marathon, Marathon, Trail, Ultramarathon
May 4, 2025
100-500 runners
Longmont, Colorado
- 5k, Half Marathon, Trail
May 5, 2025
500-1000 runners
Fort Collins, Colorado
- 10K, 5k, Half Marathon, Marathon, Road
May 10, 2025
1-100 runners
Colorado Springs, Colorado
- Half Marathon, Trail
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 are the most popular cities to run Colorado half marathons?
