Boulderthon

Road Run

Boulderthon

Sep 27, 2026

24 days away

Boulder

Colorado

5K | 10K | Half Marathon | Marathon

Distance

Pricing

Early Bird

until Mar 1$

Price Increase

Apr 1, 2026

Registration Window

Closes

Sep 27, 2026

Discount Code

SAVE20MAY to save $20 on registration by May 8

Official Website