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Sunday, 9/27/26
5k, 10k, Half Marathon & Marathon
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.
For ALL race details, including travel & hotel info, visit
DISCOUNTED RACE ENTRY FOR CES WEST!
We have secured a 10% discount off ALL distances at the 2026 Boulderthon.
Even better, all CES West athletes that register with the link below will also receive a co-branded Boulderthon/CES West t-shirt for FREE!
IMPORTANT NOTE: EXTRA SAVINGS OPPORTUNITY & PRICE INCREASE
Extra Savings: if you register 3 or more people at the same time, you’ll save an additional 20%!
Prices go up on 3/1, so act soon and save some $$
(click image for larger map)
Race Schedule
Race Schedule
Expo and Bib Pickup
Taking place during Race Weekend between Broadway and 15th on the Pearl Street Mall on:
Friday, 9/25 from 1-5pm
Saturday 9/26 from 10am - 6pm
Sunday 9/27 from 8am - 2:30pm
Race Start Times
Half/Full Marathon: 7:00am
5K: 7:45am
10K: 8am
Kids Run: 8:15am
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