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.
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marathon participants and tents in Boulder Reservoir

START & FINISH MAPS

Marathon and Half Marathon Start Area Map

Boulder CO Marathon start area map

Most updated version as of 9/20/22

10K Start Area Map

Boulder CO 10K start area map

Most updated version as of 9/20/22

Finish Area Map

Boulderthon Expo Map

Most updated version as of 1/3/22

BOULDERTHON®
A STRONGER FASTER BOULDER CO. PRODUCTION
1420 PEARL ST.
BOULDER, CO 80302

CONTACT US
© 2022 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.