Boulderthon 5k in Boulder, CO

A fast, fun 5k with a Start & Finish in Downtown Boulder.

Join us on Sunday, October 8th, 2023 for the Boulderthon 5k in Boulder, Colorado. The course gives 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 Registration

Registration for the Boulderthon 5k is open.

Boulderthon also offers a Kids Run, 10k, Half Marathon and Full Marathon.

Boulderthon - Boulder Marathon - 5k Course Map

Boulderthon 5k Information

Date: October 8, 2023

Start Time: 8:00 am

Time Limit: None 

Elevation Gain: 296 feet

Download Course Map

Event Day

  • Boulderthon offers Early Bib Pickup (open to all) beginning Saturday, 9/30/23 through Thursday, 10/5/23 at 2pm at all Colorado Fleet Feet locations during their normal hours.
    • Finisher-Shirts will not be available at Early Bib Pickup. Participants who pick up their packet at Early Bib Pickup can pick up their race shirt after they complete their race on Sunday 10/8.

  • Our Official Expo & Bib 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-6pm.

This year, Boulderthon features its first-ever Start and Finish Downtown.

Our Start Village is hosted on the Pearl Street Mall, between 13th and 15th.

The Start Line is at 21st and Pearl. The Finish is at 15th and Pearl. 

Here are the best ways to get to the Start.  For questions, please contact support@boulderthon.org

1. Take an Uber

Use Our Designated Uber Drop Off Lanes

Please enter address 1400 Walnut St, Boulder CO 80302 into Uber (the start of the Drop Off Lanes) to Uber to the Start Village Presented by Uber.

*Note- please use these lanes for all runner drop off.

Try Uber One Membership with a Free 3-Month Trial

$0 Delivery Fee and up to 10% off eligible orders, plus 6% Uber Cash back on eligible rides.

Click link for terms & sign up now.

Terms apply. See uber.com/uberone

2. Carpool with our partner, TreadShare

Embrace sustainability and community spirit by carpooling with TreadShare to Boulderthon!


  • Download the App 

  • Create a profile

  • Book a ride or post a drive in just a few clicks to Boulderthon

  • Earn $5 for completing a carpool - redeem by sending the promo code: BOULDERTHON to info@treadshare.com after completing one ride or drive by 11:59pm MDT on 10/8/23.

Reduce your carbon footprint, ease congestion, and make a positive impact on the event's accessibility!

3. FREE Parking!

Please reference our FREE Parking Garage Map.

Please note, these garages will fill up first and we suggest arriving at least 2 hours prior to the Start.

All parking is FREE in Downtown Boulder on Sundays. See below for the best places to park!


  • There will be port-a-potties on course. Please respect our community and utilize these for your needs.


  • Water Stations will be available throughout the course. Please see maps for specific locations.


  • A number of highly trained physicians, nurses, physical therapists and other medical personnel will be on hand throughout race weekend.
  • There will be a number of mobile units moving throughout the course. These units will be staffed by paramedics, EMTs and marathon staff.
  • There will also be ambulances stationed at the finish line and throughout the course.

There is no gear check for the 5k.