Boulderthon Half Marathon is expected to sell out. Over 4,000 runners are expected at this year’s Boulderthon from 50 states and 13 countries, with registrations coming in over 2x the rate of last year. 5k, 10k, Full Marathon are Nearing Capacity. Register today.
Pearl Street Mall in Boulder


Boulderthon is proud to present Marriott and St. Julien as our partner hotels.

Courtyard Boulder

Exclusive Boulderthon Rate - $199/night. Book now.

Start Date: Friday, October 7, 2022
End Date: Sunday, October 9, 2022
Last Day to Book: Thursday, July 7, 2022

St. Julien Hotel

Elevate your stay with Boulder's premier luxury hotel. Book now. Exclusive Boulderthon Rate: $479/night.