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Colorado Half Marathon Races
Upcoming 13.1-mile races in Colorado. Compare dates, courses, and registration.
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Colorado
Hub
Marathon
Half Marathon
5K
10K
Colorado Springs
February 6, 2027
Stories Trail Runs
10K
Half Marathon
20 Mile
Arvada
April 11, 2027
Spring Fling Prairie Dog Half Marathon 10K & 5K
5K
10K
Half Marathon
Fort Collins
April 18, 2027
Horsetooth Half Marathon
Half Marathon
Loveland
April 24, 2027
NoCo Half Marathon & 10K
Half Marathon
10K
Longmont
May 2, 2027
Longmont Half Marathon & 5K
5K
Half Marathon
Colorado Springs
May 8, 2027
Valkyrie Trail Race
Half Marathon
Marathon
50K
Ultramarathon
Denver
May 15, 2027
Denver Colfax Marathon and Half Marathon
Half Marathon
Marathon
10 Mile
Relay
5K
May 15, 2027
Endure Trail Runs
12 Hour
Ultramarathon
10K
Half Marathon
Marathon
Boulder
June 6, 2027
Colorado 13er
5K
Half Marathon
10K
Granby
June 12, 2027
Summits Trail Runs
10K
Half Marathon
50K
Marathon
Ultramarathon
June 19, 2027
Red, White and Brew 5k, 10k & Half Marathon
10K
5K
Half Marathon
Castle Rock
July 17, 2027
Summer Splash Prairie Dog Half Marathon, 10k & 5k
5K
10K
Half Marathon
Boulder
August 6, 2027
Rocky Mountain Half & 5K
5K
Half Marathon
Denver
August 15, 2027
Erie Half & 5K
5K
Half Marathon
Westminster
August 22, 2027
Pioneer Prairie Dog Half Marathon, 10K & 5K
5K
10K
Half Marathon
