Boulderthon Half Marathon is expected to sell out. Over 4,000 runners are expected at this year’s Boulderthon from 50 states and 13 countries, with registrations coming in over 2x the rate of last year. 5k, 10k, Full Marathon are Nearing Capacity. Register today.
Finish line of Boulderthon at the end of the street
5K

Boulderthon 5k in Boulder, CO

Join us on Saturday, Oct 8, 2022 for the Inaugural 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!

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Boulderthon 5k Information

Date: Saturday, October 8th, 2022

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 Saturday, October 8th. On Sunday, October 9th our other races include a 10k, 1/2 Marathon and Full Marathon.

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Race Packet Pick Up:

  • Boulderthon offers Early Packet Pickup (open to all) beginning Saturday, 10/1/22 through Thursday, 10/6/22 at Boulder Running Company (2775 Pearl St. Boulder, CO 80302) during their full normal hours, Saturday - Thursday, 10am-7pm, and Sunday 10am-5pm.

  • Our Official Expo & Packet Pickup will take place on the Pearl Street Mall between 13th and 15th, at the times below:
    • Friday, 10/7: 2pm - 6pm
    • Saturday, 10/8: 8am - 4pm (on this day, registration for our Saturday 5k will open at 7am on the Pearl Street Mall, in advance of the 5k race at 8am)
    • Sunday, 10/9 (After Party): 8am - 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

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Gear Check

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

Course Support

  • There will be one water station on Edgewood right before Folsom