Run Boulderthon: The Boulder Marathon
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About the race
Boulderthon is a fall race weekend held in Boulder, Colorado beneath the Flatirons. The event scheduled for September 27, 2026 hosts more than 15,000 runners from all 50 states and multiple countries and has received national recognition from publications such as Runner’s World, USA TODAY and Active.
Race distances offered include:
- Full Marathon
- Half Marathon
- 10K
- 5K
- Kids Run
Every finisher receives a limited‑edition lululemon Metal Vent Long Sleeve or Swiftly 2.0 Hip‑Length Long Sleeve (listed value $88). The course includes precision fuel and hydration stations approximately every two miles, live music and community cheer zones, near real‑time runner tracking with mid‑race audio cheers, AI‑powered race recaps, and near‑real‑time race photos.
Sustainability measures cited for the event include race bibs for the 5K made from industrial hemp, 100% recycled medals, reusable and compostable cups intended to reduce landfill waste, and aluminum cans at the finish for recyclable hydration. The event describes several technology features such as personalized race insights, smart tracking, custom recaps, and a community‑designed medal.
The weekend also includes an outdoor expo on Pearl Street and a finish‑line after‑party, along with training resources, an elite athlete program, charity options, and a Strava club. Boulderthon is produced by Stronger Faster Boulder Co., a federally recognized 501(c)(3) nonprofit. Visit the organization's website for the most recent information.
