About

Boulderthon is now presented by lululemon! All participants will receive their choice of a lululemon Metal Vent Tech or Swiftly Tech long sleeve ($88 value), plus a limited-edition, premium lululemon x Boulderthon merch shop will be onsite Race Weekend, powered by Fleet Feet. Boulderthon is one of the fastest-growing marathons in the US and was rated top 10 in America by USA Today for the last 3 consecutive years, and among the Best Fall Marathons by Runners World. They have a 5K, 10K, Half, Full and even a Kids Run. Register now for the annual sell-out race and experience the magic of Colorado’s premier fall marathon!

Marathon, Half Marathon, 10K Presented by Cheribundi, and 2 more

Where and when

Location1303 Pearl St, Boulder, CO 80302, USAStart timesMarathon: 6:30 AMHalf Marathon: 6:30 AM10K Presented by Cheribundi: 7:30 AMHeart to Heart 5K Presented by BCH: 7:00 AMKids Run: 8:30 AM

Event summary

Here are the distances available for Boulderthon powered by lululemon: The Boulder Marathon

1-4 / 5

Marathon26.2mi$169 - $325Half Marathon13.1mi$159 - $31010K Presented by Cheribundi10km$69 - $165Heart to Heart 5K Presented by BCH5km$54 - $145

Route information

Ranked the fastest-growing marathon in the US and one of America's most-loved running events, Boulderthon will be back bigger and better in 2026. Combining stunning scenery, a lively atmosphere, and an incredible Start & Finish Downtown, the event has been named one of the best marathons in the US by USA Today and Runners World. A boutique marathon nestled in the foothills of the Rockies with stunning views throughout the course, Boulderthon offers a marathon, half marathon, plus an all-new, all-roads 10K, and 5K, as well as a Kids Run. With the goal of spreading the joy and power of running and creating a more inclusive community, Boulderthon caters to all ages and abilities, and gives you the chance to experience the magic of the running mecca of Boulder, plus run against the stunning backdrop of Colorado’s Flatiron mountains!

All-roads 10K and 5K, with one of the nation's largest 5K prize purse at over $40,000. Experience Colorado's flattest and fastest 5K!

Marathon The marathon course starts in vibrant downtown Boulder, goes up past the Boulder Reservoir, and back down into Beautiful Downtown Boulder, finishing on Spruce, at the heart of our Finish Festival. Cut-off time: 2:00pm Half Marathon Half marathon runners will follow a similar route, beginning on Pearl Street turning around 8.8 miles in and heading back down to Pearl St! Cut-off time: 2:00pm 10K Presented by Cheribundi The 10K is the perfect fall race, with a route taking in the streets of Downtown Boulder and some of the amazing views offered by the city. You’ll head along Pearl Street and then onto Pearl Parkway, where you’ll be spurred on by live music! Just after Valmont City Park, you’ll loop back towards downtown Boulder, following the same route and then finishing on Spruce. Heart to Heart 5K Presented by Boulder Community Health This speedy 5k is an all-roads course, starting and finishing in downtown Boulder. The 5K is the flattest, fastest roads 5K prize purse and boasts one of the largest 5K prize purse in the nation at over $40,000. Kids Run Returning for its sixth year, the popular kids' run starts at 21st and Pearl and ends with an incredible finish on the historic Pearl Street Mall! Parents can run for free with their child, so this is the perfect introduction to running for your little ones.

What's included

Limited Edition Finisher Medal, designed by our very own runners
a lululemon Metal Vent Tech or Swiftly Tech long sleeve ($88 value)
Laurel Chip Timing - the industry’s next-generation, near real-time tracking platform—keeps your family and friends connected so they can cheer you on every step of the way.
Free Athletic Brewing and/or (1) Drink for marathon and half marathon runners
Prizes for Top finishers and Age Group Awards
One of the nation's largest 5K prize purses at over $40,000, on Colorado's flattest & fastest roads 5K
Stunning Event/Participant Photography
Water & Hydration Stations
Pre-race and on-course fueling stations
Gear Check
Cheer Stations
Medical support
Epic After Party Presented by Athletic Brewing
One of the nation’s largest outdoor expos, this dynamic Race Expo in the heart of Downtown Boulder features 70+ local and national partners, draws over 40,000 total attendees, and offers engaging live programming and panel discussions.

How to get there

1303 Pearl St, Boulder, CO 80302, USAGet full directionsStart Village, Start Line and Finish Line Locations The Start Village is hosted on the Pearl Street Mall, between Broadway and 15th. The Start Line is at 18th and Pearl. The Finish is at 15th and Spruce. Participants can either Uber or carpool to the startline using Treadshare, or can use the free parking available. Parking Free parking is available on race weekend at:

11th & Spruce Garage
14th & Walnut Parking Garage (VIP Only)
11th & Walnut Garage
10th & Walnut Garage
15th & Pearl Parking Garage

It is recommended that participants arrive at least 2 hours before the race start if using free parking.

Hotels and Accommodation

Find some of the best hotel rates close to the startline with Hotel Planner.Find your room

Event day logistics

Start Times 7:00AM: Marathon and Half Marathon Start 7:45AM: 5K start 8:00AM: 10K Start 8:15AM: Kids Run start 2:00 M: Marathon and Half Marathon Cut-off Time Bib Pickup Boulderthon offers Early Bib Pickup (open to all) beginning Thursday, 9/17/26 through Thursday, 9/24/26 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 9/27/26. Our Official Expo & Bib Pickup will take place on Pearl St Mall between 14th & 15th, on Friday, 9/25/26, from 2pm-6pm, and Saturday, 9/26/25 from 10am-6pm.You will need to bring your QR code from your final race confirmation email and a photo ID to the Race Expo to receive your bib. Age Limits Runners must be 9 and older for the half marathon and 13 and older for the marathon. Gear Check Participants will be provided with an official plastic bag to store their belongings in. Tear off the Gear Check tag from your race bib and attach it to the bag. After you complete the race, please claim your gear as soon as possible. Gear can be picked up until 1:00 PM on race day. Boston Marathon Qualification Boulderthon is a Boston Marathon Qualifying (BQ), USATF Sanctioned Event. If you achieve your BQ time at the 2026 Boulderthon, this will apply to the 2027 Boston Marathon. Pacing BEAST Pacing will be pacing the marathon and half marathon. Pace groups are as follows: Marathon

3:30
3:45
4:00
4:30
5:00
5:30

Half Marathon

1:30
1:45
2:00
2:15
2:30
2:40

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