You can run Colorado half-marathon events in Arvada, Aspen, Bayfield, Beulah, Boulder, Breckenridge, Brighton, Buena Vista, Canon City, Castle Rock, Centennial, Cheyenne, Colorado Springs, Denver, Divide, Durango, Erie, Estes Park, Firestone, Four Corners Monument, Frisco, Fruita, Georgetown, Golden, Granby, Grand Junction, Highlands Ranch, Lakewood, Longmont, Louisville, Nederland, Ouray, Parker, Pending, Pine, Provo, Pueblo, Red Feather Lakes, Salt Lake City, Steamboat Springs, Telluride, Trinidad, Westminster, and Windsor.
Colorado Half Marathons in August
This is the calendar of all the Colorado half marathons in August. On these race calendars, not only will you be able to search the basics of cities and dates, but you’ll also be able to find August Colorado half marathons by difficulty, scenery, race size, and attributes like whether it’s pet-friendly, stroller-friendly, or has a great finisher party.
If you can’t find the half marathon you’re looking for in Colorado in August, it’s possible the race has not updated their date to the current year or has switched months. If you know a race belongs on this calendar or have any edits you’d like to suggest for an existing race in Colorado in August, you can email us [email protected].
Filter Colorado Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
Filter Colorado Half Marathons
Race Size
Difficulty
Scenery
Type
Perfect For
Distances
August 1, 2026
1,000-10,000 runners
Estes Park, Colorado
- Half Marathon, Marathon, Trail
August 1, 2026
100-500 runners
Fairplay, Colorado
- Half Marathon, Trail
August 8, 2026
100-500 runners
Frisco, Colorado
- 10K, Half Marathon, Trail
August 15, 2026
100-500 runners
Ouray, Colorado
- Half Marathon, Marathon, Road
August 16, 2026
1-100 runners
Erie, Colorado
- 5k, Half Marathon, Trail
August 22, 2026
100-500 runners
Fraser, Colorado
- 5k, Half Marathon, Trail
August 29, 2026
500-1000 runners
Durango, Colorado
- Half Marathon, Road
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 Colorado cities have half marathons?
