Boulderthon

Experience the magic of Boulderthon presented by lululemon, recently recognized by USA Today as one of the Top 10 races in the U.S. and is one of the fastest-growing races in the country!

Boulderthon, presented by lululemon, offers a distance for everyone - a marathon, half marathon, the 10K presented by Cheribundi, the Heart to Heart 5K by BCH, and the Boulder Country Day School Kids Run. The full and half marathon courses feature sweeping views of the Flatirons, Boulder Reservoir, Table Mountain, and Haystack Mountain, before an unforgettable downtown finish on Pearl Street.

The 10K runs through Boulder's scenic streets to the same iconic finish, while the fast, flat Heart to Heart 5K includes a $40,000 prize purse - one of the largest 5K purses in the nation.

Whether it's your first 5K or your next PR, Boulderthon brings big-race energy with the charm of a mountain town. Crisp fall air, golden leaves, and a Pearl Street finish make it a race like no other.

The top-rated, fast-growing multi-distance event became the second-largest race in Colorado in its first year of existence, and the largest fall running event in the state. In its fourth annual edition, Boulderthon drew nearly 10,000 runners from all 50 states as well as 22 countries. This secured its entry into the list of the top 100 largest running events in the country, as reported by RunSignUp. In 2023, Active.com named Boulderthon one of the Top 5 Best Half Marathons in
the United States.