Registration for Boulderthon 2023 is now open! After nearly tripling in size and selling out last year, Boulderthon has instituted a new 5,000 runner cap and is expected to sell out again this year. Register today.
Finish line of Boulderthon at the end of the street

Boulderthon 5k in Boulder, CO

Join us on Sunday, October 8th, 2023 for the Boulderthon 5k in Boulder, Colorado. The course starts and ends at 15th and Pearl, giving you the perfect tour of Downtown Boulder with an incredible finish on the historic Pearl Street Mall! The Boulderthon is the perfect Fall race to test your end of the season fitness!


Boulderthon 5k Information

Date: Sunday, October 8th, 2023

Start Time: 8am

Time Limit: None

Elevation Gain: 325 feet

Course Map:

Course Map

Boulderthon 5k Registration

You can register online or show up early and register on the day of the race.

Boulderthon also offers a Kids Run on Sunday, October 8th, 2023. Our other races include a 10k, Half Marathon and Full Marathon.


Race Packet Pick Up:

  • Boulderthon offers Early Packet Pickup (open to all) beginning Saturday, 9/30/23 through Thursday, 10/5/23 at Boulder Running Company, 2775 Pearl St, Boulder, CO 80302, during their normal hours.

  • Our Official Expo & Packet Pickup will take place on Pearl St Mall between 14th & 15th, on Friday, 10/6/23, from 2pm-6pm, and Saturday, 10/7/23 from 10am-4pm.

Getting There:

  • The race starts and ends at 15th and Pearl. You are welcome to get dropped off or park in Downtown Boulder. See below for the best places to park.

Where Do I Park?

Here are the BEST FREE GARAGES to park in on Boulderthon Race Weekend. Please note that garages are free on Saturdays and Sundays in Downtown Boulder, but street parking is only free on Sundays.Parking Map


Gear Check

  • There is no gear check for the 5k as it starts and ends in the same location.