Boulder Marathon
Boulder Marathon is a Marathon race in Denver–Boulder, CO, held on Sun, Sep 27, 2026 at Boulder Reservoir . Boulder Marathon takes place on September 27, 2026 in Boulder, CO. Details and registration are on the official event page.
| Date | Sun, Sep 27, 2026 |
| Distances | Marathon |
| Venue | Boulder Reservoir |
| Address | Boulder Reservoir, Boulder, CO |
| Registration | Register for Boulder Marathon |
Listing updated Tue, Jul 21, 2026. Organize this race? Submit an update. Listing details via the organizer's page.
Racing Denver–Boulder? Get the drop.
Races like Boulder Marathon sell out — get new Denver–Boulder races twice a month plus price-jump warnings.
More races in Denver–Boulder
- Sun, Jul 26, 2026 Spirit of the West 5K Run/Walk
- Sat, Aug 1, 2026 12th Annual Run for the Ring
- Sat, Aug 1, 2026 Move with MADD Denver 5K
- Sat, Aug 1, 2026 Unicorn 5k (South)