Run Boulderthon: The Boulder Marathon

The Boulderthon: The Boulder Marathon is a premier fall running event held in Boulder, Colorado, renowned for its stunning course nestled at the foothills of the Rocky Mountains. Recognized as one of the top half marathons in the U.S., it features a scenic route with breathtaking views near Boulder Reservoir and an epic start and finish in downtown Boulder, including the historic Pearl Street Mall. The course offers a 40–50% reduction in elevation gain, making it more runnable and appealing to a wide range of runners.

The event includes multiple distances such as marathon, half marathon, 10K, and 5K, attracting thousands of participants annually. Boulderthon is celebrated for its vibrant festival atmosphere, excellent organization, plentiful aid stations, and a lively after-party, making it a must-run race in a city known for its sunshine, recreation, and community spirit. Visit the organization's website for the most recent information.