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.

Benefiting the Community

In only its fifth year, the event generated an estimated economic impact of $22.8 million locally and regionally.

Outside of race weekend, the organization leads ongoing volunteer and environmental adoption efforts, hosts free year-round community events, and has a program to promote accessibility to racing through no-cost bibs.

Packet Pickup - Downtown Boulder, Pearl Street Mall between 13th and 15th

Friday, Sept. 25: 1 - 5 p.m.

Saturday, Sept. 26: 10 a.m. - 6 p.m.

Race Times

Sunday, Sept. 27

7 a.m.: Half and full marathon start time

7:45 a.m.: 5K start time

8 a.m.: 10K start time

8:15 a.m.: Kids Run start time

Course Amenities

Water and Hydration Stations will be staggered approximately every 3-4 miles. Precision Fuel and Hydration will be available at all Water Stations. There will be port-a-potties on course.

Awards

Information on awards can be found here: https://www.boulderthon.org/awards-and-prizes

URL:

Tickets: https://go.evvnt.com/3599600-0?pid=10335

Price:

Registration: USD 39.00

Category: Sports / Leisure | Running

Date and Time: 27th September 2026 at 7:00 am to 12:00 pm

Venue details: Pearl Street Mall, 1303 Pearl Street, Boulder, Colorado, 80302, United States