Registration for Boulderthon 2023 is now open! After nearly tripling in size and selling out last year, Boulderthon has instituted a new 5,000 runner cap and is expected to sell out again this year. Register today.
Boulderthon logo
HOMEFAQRESULTS & PHOTOSABOUT USCOMMUNITY IMPACTSCHALLENGESSTREAKERSVOLUNTEERPARTNERREGISTER

THE SIGNATURE BOULDER MARATHON
WITH A DOWNTOWN FINISH

10.8.23

REGISTER
LEARN MORE
People gathered at the starting point of the Boulder marathon and texts like 'spectacular' and 'epic' written on the foreground
SCROLL
People gathered at the starting point of the Boulder marathon and texts like 'spectacular' and 'epic' written on the foreground
SCROLL
People gathered at the starting point of the Boulder marathon and texts like 'spectacular' and 'epic' written on the foreground
SCROLL
People gathered at the starting point of the Boulder marathon and texts like 'spectacular' and 'epic' written on the foreground
SCROLL
Finish line of the Boulderthon run with text overlay saying 'best Colorado races'
SCROLL
Aerial view of a park in Boulder with text overlay saying 'run a marathon in the happiest city in America'
SCROLL
aerial view of a road in the middle of the foothills with text overlay saying 'the signature city marathon that Boulder deserves'
SCROLL
arerial view of the city at the foothills with text overlay saying 'set at the foothills of the rockies'
SCROLL
aerial view of the city at the foot of the mountains with text overlay saying '3+ years in the making'
SCROLL
aerial view of the Folsom Field stadium with a text overlay saying 'join the Boulder community'
SCROLL
aerial view of the city at the foothills with text overlay saying 'for the first time in history, an epic downtown finish'
SCROLL
aerial view of a road in the middle of the foothills with a text overlay that says 'feel on top of the world'

Boulderthon was named one of the Top 5 Best Half Marathons in the United States by Active.

Run a 5k, 10k, Half, or Full, at the foothills of the Rockies, in the stunning running mecca of Boulder. Run the streets Olympians train on, then celebrate at our epic after-party downtown!

Secure your spot now in Colorado’s largest fall running weekend! After nearly tripling in size last year and selling out, Boulderthon has instituted a new 5,000 runner cap this year and is expected to sell out again.

BOULDERTHON®
A STRONGER FASTER BOULDER CO. PRODUCTION

CONTACT US
© 2023 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.