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.
[race_calendar_title]
September 27, 2026
1,000-10,000 runners
[get_race_listing_state_city post_id="122511"]
- Half Marathon, Marathon, Road
October 3, 2026
1-100 runners
[get_race_listing_state_city post_id="121140"]
- 10K, 5k, Half Marathon, Marathon, Trail
August 23, 2026
100-500 runners
[get_race_listing_state_city post_id="123110"]
- 10K, 5k, Half Marathon, Road
October 3, 2026
500-1000 runners
[get_race_listing_state_city post_id="122583"]
- 5k, Half Marathon, Marathon, Road
October 4, 2026
100-500 runners
[get_race_listing_state_city post_id="122759"]
- 10K, Half Marathon, Trail
April 11, 2026
100-500 runners
[get_race_listing_state_city post_id="122509"]
- 10K, 5k, Half Marathon, Trail
May 10, 2026
100-500 runners
[get_race_listing_state_city post_id="122678"]
- Half Marathon, Trail
June 7, 2026
100-500 runners
[get_race_listing_state_city post_id="122815"]
- 10K, 5k, Half Marathon, Trail
May 9, 2026
1-100 runners
[get_race_listing_state_city post_id="122577"]
- 10K, 5k, Half Marathon, Road
May 10, 2026
100-500 runners
[get_race_listing_state_city post_id="150260"]
- 10K, 5k, Half Marathon, Road
June 20, 2026
100-500 runners
[get_race_listing_state_city post_id="150276"]
- 10K, 5k, Half Marathon, Trail & Road
August 22, 2026
100-500 runners
[get_race_listing_state_city post_id="150588"]
- 5k, Half Marathon, Trail
August 8, 2026
100-500 runners
[get_race_listing_state_city post_id="150573"]
- 10K, Half Marathon, Trail
August 1, 2026
100-500 runners
[get_race_listing_state_city post_id="150558"]
- Half Marathon, Trail
August 16, 2026
1-100 runners
[get_race_listing_state_city post_id="122628"]
- 5k, Half Marathon, Trail
September 19, 2026
1-100 runners
[get_race_listing_state_city post_id="123116"]
- 10K, 5k, Half Marathon, Marathon, Road
September 7, 2026
100-500 runners
[get_race_listing_state_city post_id="122895"]
- Half Marathon, Road
September 19, 2026
100-500 runners
[get_race_listing_state_city post_id="122676"]
- 10K, Half Marathon, Road
September 19, 2026
100-500 runners
[get_race_listing_state_city post_id="122524"]
- 10K, 5k, Half Marathon, Trail
February 15, 2026
100-500 runners
[get_race_listing_state_city post_id="122465"]
- 5k, Half Marathon, Road
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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?
