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
September 20, 2026
500-1000 runners
Fort Collins, Colorado
- Half Marathon, Marathon, Trail
September 26, 2026
1-100 runners
Telluride, Colorado
- Half Marathon, Trail
September 26, 2026
500-1000 runners
Aspen, Colorado
- Half Marathon, Trail
September 26, 2026
100-500 runners
Red Feather Lakes, Colorado
- Half Marathon, Trail, Ultramarathon
September 26, 2026
100-500 runners
La Veta, Colorado
- Half Marathon, Trail
September 27, 2026
1,000-10,000 runners
Boulder, Colorado
- Half Marathon, Marathon, Road
October 3, 2026
1-100 runners
Castle Rock, Colorado
- 10K, 5k, Half Marathon, Trail, Ultramarathon
October 3, 2026
500-1000 runners
Colorado Springs, Colorado
- 5k, Half Marathon, Marathon, Road
October 3, 2026
1-100 runners
Pending, Colorado
- 10K, 5k, Half Marathon, Marathon, Trail
October 4, 2026
100-500 runners
Lakewood, Colorado
- 10K, Half Marathon, Trail
October 4, 2026
100-500 runners
Windsor, Colorado
- 10K, 5k, Half Marathon, Marathon, Road
October 10, 2026
1-100 runners
Fort Collins, Colorado
- Half Marathon, Marathon, Road
October 11, 2026
100-500 runners
Westminster, Colorado
- 5k, Half Marathon, Road
October 11, 2026
1-100 runners
Breckenridge, Colorado
- 10K, Half Marathon, Marathon, Road
October 18, 2026
100-500 runners
Fort Collins, Colorado
- Half Marathon, Marathon, Trail
October 31, 2026
1-100 runners
Colorado Springs, Colorado
- 10K, 5k, Half Marathon, Road
November 1, 2026
100-500 runners
Grand Junction, Colorado
- Half Marathon, Marathon, Trail
November 1, 2026
100-500 runners
Fort Collins, Colorado
- Trail & Road, Ultramarathon
November 1, 2026
1-100 runners
Golden, Colorado
- 10K, 5k, 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 2026?
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?
