Run Boulderthon: The Boulder Marathon | Register Now

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RACES
INFO
RESULTS
TRAINING
TRAVEL
VOLUNTEER
ABOUT
MERCH
TEAMS

02 HALF MARATHON

03 10K PRESENTED BY CHERIBUNDI

04 HEART TO HEART 5K BY BCH

06 VIP BY LULULEMON

01 EXPO by INNOVAES

02 START TIMES, WAVES, & LOCATIONS

03 COURSE ENTERTAINMENT PRESENTED BY XCEL

04 AFTER PARTY PRESENTED BY MICHELOB ULTRA

01 AWARDS + PRIZES

02 RESULTS + PHOTOS

04 LIVE TRACKING

01 THE FEED - OFFICIAL NUTRITION

02 NELL ROJAS - OFFICIAL COACH

03 TRAINING PROGRAM

01 GETTING THERE

03 RESTAURANT GUIDE PRESENTED BY UBER EATS

01 SIGN UP TO VOLUNTEER

03 RUNNER EXPERIENCE ADVISORY BOARD

01 Corporate Teams

02 5k Team Challenge

03 RUN FOR CHARITY

Early Season - save up to $20 now

Marathon 72% Sold Out - Limited Space Remains

Race Date: September 28th, 2025

Register Now

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©2024 Stronger Faster Boulder Co. Boulderthon® is a registered trademark of Stronger Faster Boulder Co.

Boulderthon is a top-rated, world-class marathon series tucked away in the foothills of the Rockies in 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, CO, 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.

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