Run Boulderthon: The Boulder Marathon
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Event overview
Boulderthon is a marathon race series held in Boulder, Colorado. The courses run in the foothills of the Rockies near the Flatirons and include a downtown finish on the Pearl Street Mall. The half marathon route begins at Boulder Reservoir and leads into downtown Boulder.
Race program and organisation
The event offers multiple distances:
- Marathon
- Half Marathon
- 10K
- Heart to Heart 5K
- Kids Run
The race is USATF sanctioned, measured by a Level A USATF Course Measurer, and is a Boston Marathon qualifying event. Organiser Stronger Faster Boulder Co. is a Colorado non-profit organisation and a registered 501(c)(3) foundation. The event increased to a 15,000 runner cap and reported drawing over 15,000 runners from all 50 states and 18 countries in 2024. Race services and event features mentioned include an expo, gear check, pace groups, aid stations, a downtown finish and an after party.
Recognition and participant feedback
Boulderthon has received national recognition from outlets such as Runner’s World, Active, and USA Today. Racecheck ratings show an overall event score of 4.33 out of 5 based on 78 reviews; a summary on the site notes that 95% of runners would recommend the event, with the downtown finish and course views cited as primary reasons. Visit the organization's website for the most recent information.
