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.
Page 3 - Colorado Half Marathon Calendar
June 7, 2026
500-1000 runners
Steamboat Springs, Colorado
- 10K, Half Marathon, Marathon, Road
June 7, 2026
100-500 runners
Louisville, Colorado
- 10K, 5k, Half Marathon, Trail
June 13, 2026
1-100 runners
Arvada, Colorado
- 10K, 5k, Half Marathon, Road
June 20, 2026
100-500 runners
Windsor, Colorado
- 10K, 5k, Half Marathon, Trail & Road
July 11, 2026
1-100 runners
Westminster, Colorado
- 10K, 5k, Half Marathon, Road
July 18, 2026
100-500 runners
Castle Rock, Colorado
- 10K, 5k, Half Marathon, Trail
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
September 7, 2026
100-500 runners
Parker, Colorado
- Half Marathon, Road
September 19, 2026
100-500 runners
Frisco, Colorado
- 10K, Half Marathon, Road
September 19, 2026
1-100 runners
Westminster, Colorado
- 10K, 5k, Half Marathon, Marathon, Road
September 19, 2026
100-500 runners
Buena Vista, Colorado
- 10K, 5k, Half Marathon, Trail
October 3, 2026
500-1000 runners
Colorado Springs, Colorado
- 5k, Half Marathon, Marathon, Road
October 4, 2026
100-500 runners
Lakewood, Colorado
- 10K, 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 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?
