Colorado Springs, Boulder, and Denver are the most popular cities to run a Colorado half marathon in.
Upcoming Colorado Half Marathons in Boulder
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
October 4, 2025
500-1000 runners
Colorado Springs, Colorado
- 5k, Half Marathon, Marathon, Road
Featured Race
June 7, 2025
500-1000 runners
Provo, Arizona
- 10K, Half Marathon, Marathon, Road
Featured Race
May 18, 2025
1,000-10,000 runners
Denver, Colorado
- Half Marathon, Marathon, Road
Featured Race
April 26, 2025
1,000-10,000 runners
Salt Lake City, Arizona
- 10K, 5k, Half Marathon, Marathon, Road
April 26, 2025
1-100 runners
Brighton, Colorado
- Half Marathon, Marathon, Trail, Ultramarathon
May 3, 2025
1-100 runners
Louisville, Colorado
- 10K, 5k, Half Marathon, Trail
May 4, 2025
500-1000 runners
Fort Collins, Colorado
- 10K, 5k, Half Marathon, Marathon, Road
May 4, 2025
100-500 runners
Longmont, Colorado
- 5k, Half Marathon, Trail
May 10, 2025
100-500 runners
Firestone, Colorado
- 5k, Half Marathon, Road
May 10, 2025
1-100 runners
Colorado Springs, Colorado
- Half Marathon, Trail
May 17, 2025
1-100 runners
Colorado Springs, Colorado
- Half Marathon, Trail
May 18, 2025
1,000-10,000 runners
Denver, Colorado
- Half Marathon, Marathon, Road
May 18, 2025
1-100 runners
Divide, Colorado
- Half Marathon, Trail
May 25, 2025
1-100 runners
Buena Vista, Colorado
- Half Marathon, Marathon, Trail
June 1, 2025
100-500 runners
Louisville, Colorado
- 10K, 5k, Half Marathon, Trail
June 1, 2025
500-1000 runners
Steamboat Springs, Colorado
- 10K, Half Marathon, Marathon, Road
June 7, 2025
1-100 runners
Arvada, Colorado
- 10K, 5k, Half Marathon, Road
June 15, 2025
100-500 runners
Estes Park, Colorado
- Half Marathon, Marathon, Trail
June 22, 2025
1-100 runners
Colorado Springs, Colorado
- 10K, 5k, Half Marathon, Road
June 28, 2025
1,000-10,000 runners
Georgetown, Colorado
- Half Marathon, Road
July 12, 2025
1-100 runners
Westminster, Colorado
- 10K, 5k, Half Marathon, Road
July 19, 2025
100-500 runners
Castle Rock, Colorado
- 10K, 5k, Half Marathon, Trail
August 2, 2025
100-500 runners
Arvada, Colorado
- 10K, 5k, Half Marathon, Road
August 2, 2025
1,000-10,000 runners
Estes Park, Colorado
- Half Marathon, 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?
