Register now to save with Early Bird Pricing! New in 2022: 10k + Kids Run.
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COURSE MAPS

Course Maps & Elevations may be adjusted based on covid-19 safety modifications, local and state recommendations, and higher-than-anticipated registration numbers to accommodate a larger participant count, and provide the best overall runner, spectator, and Boulder County & City of Boulder resident experience. If you have any questions, feedback, or suggestions, please do not hesitate to contact us at hi@boulderthon.org.

Interactive Course Map

Half Marathon Course Map & Elevation
Full Marathon Course Map & Elevation
10k Course Map & Elevation
Kids Course Map & Elevation
BOULDERTHON®
A STRONGER FASTER BOULDER CO. PRODUCTION
1420 PEARL ST.
BOULDER, CO 80302

© 2021 Stronger Faster Boulder Co.

Boulderthon is a Boston Marathon Qualifying (BQ), USATF Sanctioned Event, measured by a Level A USATF Course Measurer, representing the highest level of certification for a marathon race series.

Based in Boulder, Colorado, Stronger Faster Boulder Co. is a Colorado non-profit organization and federally-recognized as a 501(c)(3) tax-exempt foundation, EIN # 84-2863972. Donations and contributions are tax-deductible as allowed by law.