Boulderthon is one of the top-rated
marathons in the United States

Tucked into a picturesque valley below the iconic Flatirons, Boulder, Colorado sets the backdrop for the top-ranked, signature Boulder Marathon, Boulderthon. Boulder is a world-class destination offering 300 days of sunshine and endless recreation, shopping, dining, cultural and entertainment choices. It's no wonder National Geographic named Boulder the Happiest City in America.

Join us on for the largest September running weekend in the U.S., on Sunday, September 29th, 2024 for the fourth annual Boulderthon Marathon in stunning Boulder, Colorado.

The course features an exciting, all-new Start downtown, then leads you through the beautiful back roads of Boulder, Colorado at the foothills of the Flatirons, before winding you to Downtown Boulder for an epic, one-of-a-kind finish on the historic Pearl Street Mall! Boulderthon is the perfect fall race to enjoy Boulder, Colorado, named the happiest & fittest city in America.

Boulderthon has doubled in size every year since its inception, selling out each year, and is expected to sell out again.

Boulderthon is a Boston Marathon Qualifier.

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Boulderthon - Boulder Marathon - Full Marathon Course Map

Full Marathon

Date: Sunday, September 29th, 2024

Start Time: 7am

Course Close: 2:30pm

Boulderthon Marathon Registration

Registration for the Boulderthon Marathon is open.

Boulderthon also offers a Kids Run, 5K, 10K & Half Marathon.


Event Day

  • Boulderthon offers Early Bib Pickup (open to all) beginning Saturday, 9/22/24 through Thursday, 9/26/24 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 9/29/24.
  • Our Official Expo & Bib Pickup will take place on Pearl St Mall between 14th & 15th, on Friday, 9/27/24, from 2pm-6pm, and Saturday, 9/28/24 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

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

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 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!

  • Gear Check is available at the start
  • Gear Check bags will be available at Gear Check
  • We will transport anything you put in your Official Gear Check Bag to the Finish Area for you.
  • Please plan for chilly weather! Colorado can be chilly in October, with lows of 40 degrees in the morning. Plan on extra layers and check them into your Official Gear Check Bag.
  • There will be port-a-potties on course. Please respect our community and utilize these for your needs.


  • Water & Hydration Stations will be staggered approximately every 3-4 miles. Please see maps for specific locations.
    • UCAN Hydrate will be available at all Water Stations in labeled UCAN cups.


  • UCAN Edge, the Official Energy Gel of the 2023 Boulderthon, will be available at our pre-race fueling station before the race, and 3 additional stations on course. Please see maps for specific locations.

    • UCAN Edge energy gel is changing how runners fuel - delivering steady, long-lasting energy that's easy on the stomach. Edge features steady-release carbs instead of sugar, so you don't get the dreaded spike and crash. 

Get FREE samples of UCAN Edge for just the cost of shipping! Order HERE  to get the pack for just the cost of shipping.


  • 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.

  • Cheer runners on at the Finish! First 250 spectators will get cowbells. Join the fun at Pearl & 15th St, including our first-of-its-kind finish at the Pearl Street Mall!
  • You can also cheer runners on throughout the course at any of our Hydration Stations!
  • In addition, our Xcel Power-Up Cheer Stations information is coming soon!
  • Our Official After Party will be at Avanti. Soak in the best views in town at their roof deck and celebrate your amazing accomplishment!

Boulderthon Marathon Reviews


This was by far one of the best races I’ve participated in - Aid stations were dispersed well and there was so much help and encouragement from the volunteers and police officers. Thank you thank you thank you.


Fun course, positive vibes, beautiful views and just enough support along the way. Thanks to all who helped make this race happen. I’ll be back every year. Perfect Race.


I've run nearly 50 marathons and/or half marathons and this ranks among the very best. Race day execution was flawless and I echo the previous comments about the professional staff and well organized volunteers groups. Looking forward to next year already!