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]
May 3, 2025
1-100 runners
[get_race_listing_state_city post_id="138606"]
- 10K, 5k, Half Marathon, Trail
May 17, 2026
1,000-10,000 runners
[get_race_listing_state_city post_id="122615"]
- Half Marathon, Marathon, Road
October 18, 2026
100-500 runners
[get_race_listing_state_city post_id="137821"]
- Half Marathon, Marathon, Trail
December 31, 2025
100-500 runners
[get_race_listing_state_city post_id="137813"]
- 5k, Road, Trail
August 24, 2024
100-500 runners
[get_race_listing_state_city post_id="123119"]
- 10K, 5k, Half Marathon, Trail
April 20, 2024
1-100 runners
[get_race_listing_state_city post_id="123113"]
- Half Marathon, Road
December 7, 2025
100-500 runners
[get_race_listing_state_city post_id="122918"]
- Half Marathon, Trail
September 21, 2024
1-100 runners
[get_race_listing_state_city post_id="122924"]
- 5k, Half Marathon, Trail
April 27, 2024
100-500 runners
[get_race_listing_state_city post_id="122816"]
- 10K, Half Marathon, Road
October 19, 2024
1-100 runners
[get_race_listing_state_city post_id="122822"]
- 5k, Half Marathon, Trail
April 21, 2024
1-100 runners
[get_race_listing_state_city post_id="122580"]
- Half Marathon, Road
September 17, 2023
1-100 runners
[get_race_listing_state_city post_id="122517"]
- 5k, Half Marathon, Trail
August 5, 2024
1-100 runners
[get_race_listing_state_city post_id="122470"]
- Half Marathon, Marathon, Trail
1-100 runners
[get_race_listing_state_city post_id="103844"]
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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?
