Name: Dirt Circus Boulder
Start: 2026-08-08T08:00:00-06:00
Location: Runners Roost (Boulder)

Come Run, Come All to Dirt Circus Boulder, a free community event by UltraSignup, together with Runners Roost!
The FREE one-day trail running festival will highlight local races, run clubs, brands, and other local businesses. The event includes a community social run, food, a raffle with tons of prizes, camaraderie, and so much more. Come and join us under the big top.
Advance registration is required and opens May 8, 2026: https://ultrasignup.com/register.aspx?did=133667
Join our online community at: https://www.facebook.com/groups/1764061477492292
Follow us on Instagram @DirtCircus
Dirt Circus is a series of FREE community events organized by UltraSignup to celebrate local races, and race directors. We are bringing together the local running community to share everything we love about trail running.
Huge thanks to our local race partners BeyondHome's Break of Dawn North Table Trail Race, Gemini Adventures, and The Stoke Fine Racing Events!
Big shout out to our series sponsors LMNT, SILO, and Precision!
EVENT DETAILS
Saturday, August 9, 2025 at Runners Roost Boulder
7:00am - Group Run check-in at Runners Roost Boulder
Give yourself time to check in, mingle, demo shoes, and get ready to run. Participants will receive a sweet UltraSignup branded "Shoe Bag Lite" upon check-in (while supplies last), plus hydration + fueling goodies from LMNT & Precision! And to help ramp up the fun, we are partnering with Wildsense for our face decorating, glitter station!
8:00am - Group run starts!
Choose between a 4.4 and 6.6 mile route on trails with friends! All paces welcome - even hiking.
8:40-10:00am - Return from Group Run for the festivities, food, and enjoy the Dirt Circus Expo!
10:00-12:00am - Raffle, Brand Expo, Social Connections
Get excited for raffle prizes from brand partners, race entries, and cool swag & apparel! We'll have brand booths and tables set up around Runners Roost Boulder when you return from your run, whatever distance you chose. Talk to Race Directors, learn about local races, and maybe test out some hydration and nutrition brands!