Road · Half Marathon
Boulderthon Half Marathon (Spring)
Date to be announced
Boulder, CO
Boulderthon Half Marathon (Spring) is a road race of 13.1 miles (21.1 km) in Boulder, Colorado. Its next date hasn't been announced. Registration is open to all. The field is about 3,600 runners.
There are 59 other upcoming races up to a half marathon in Colorado.
13.1miDistance
3,600runnersField
Questions about Boulderthon Half Marathon (Spring)
Where is Boulderthon Half Marathon (Spring)?
Boulderthon Half Marathon (Spring) is held in Boulder, Colorado.
How long is Boulderthon Half Marathon (Spring)?
Boulderthon Half Marathon (Spring) is 13.1 miles (21.1 km).
How do you get into Boulderthon Half Marathon (Spring)?
Boulderthon Half Marathon (Spring) has open registration.
What other races up to a half marathon are there in Colorado?
Other upcoming races up to a half marathon in Colorado include Louisville Trail Race (November 14, 2026), Louisville Trail Race (November 14, 2026) and Louisville Trail Race (November 14, 2026).
Other races in Colorado
- Louisville Trail Race Half Marathon · Nov 14, 2026
- Louisville Trail Race 5K · Nov 14, 2026
- Louisville Trail Race 10K · Nov 14, 2026
- Turkey ROCK Trot (Plum Creek Church) 5K · Nov 2026, TBD
- Colorado Cold Rush Ultra 10K · Nov 21, 2026
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