Run Boulderthon: The Boulder Marathon
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Run Boulderthon: The Boulder Marathon - Boulder, Colorado
Run Boulderthon is a race series staged in Boulder, Colorado, in a valley below the Flatirons at the foothills of the Rocky Mountains. The event program includes multiple distances and a downtown finish with an after party.
- Marathon
- Half Marathon
- 10K
- 5K (Heart to Heart)
- Kids Run
The event is USATF sanctioned, Boston Marathon qualifying, and measured by a Level A USATF course measurer. Race services and event features listed by organizers include an expo, gear check, pace groups, course pacers, plentiful aid stations, course entertainment, and VIP options.
The series has received national recognition from several outlets, including Runner's World and Active, and USA Today placed its 5K and Half Marathon among top races in recent years. In 2024 the event drew over 15,000 runners from all 50 states and 18 countries. Post-race feedback cited the downtown finish and course views as frequent reasons runners recommend the event. Visit the organization's website for the most recent information.
