Sports
Boulderthon 5K & 10K
Large-scale running event with 5K and 10K options alongside marathon and half marathon. Part of largest September running weekend with significant participant volume and post-race social activities.
- When
- Sep 27, 2026
- Where
- Boulder, CO
- Est. attendance
- 2000
- Organizer
- Boulderthon
About this event
Large-scale running event with 5K and 10K options alongside marathon and half marathon. Part of largest September running weekend with significant participant volume and post-race social activities.
View original listing on boulderthon.org →Track record & vendor details
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