August 8, 2026 Come Run, Come All to Dirt Circus Boulder! The Dirt Circus returning to Boulder, Colorado. 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. The one-day festival will highlight local races, run clubs, brands, and other local businesses. The event includes a social run, food, a raffle with tons of prizes, camaraderie, and so much more. Come and join us under the big top.For information on Dirt Circus events in other cities check out dirtcircus.ultrasignup.com + join our online community on Facebook! Local Store Partner This event is possible because of the local partnership of Runners Roost in Boulder. Stop on in for all the running shoes, apparel, and other gear you could need. Dirt Circus Boulder Partners Dirt Circus is a party to bring together the whole running community, not just runners, but also race
companies, coaches, nutritionists, and running brands. See below for some of the partners who will join us in Boulder! Are you a race director, run club, or other local run business that wants to be a part of the event? Fill out this form, we'd love to hear from you.SponsorsRace Companies Onsite VendorsAltra • Asics • Brooks • Buff • Elite Massage • Hoka • Nathan • Neversecond • On • Precision Fuel & Hydration • La Sportiva • Mount to Coast • Salomon • Saucony • Topo Athletic • and more!Run ClubsBlack Men Run + TURF Denver • Coffee Run Club Boulder • Denver Beer Co’s South Downing Run Club • Denver Black Girls Run Club • Roxborough Running Club • and more! Volunteers We LOVE our volunteers - and could use additional help with Runner-Check In, with Leading and Sweeping our group runs, and during the Raffle! If you are interested check out the Volunteer Link and we will make sure you get hooked up with extra swag for your support! And don't worry about missing out, all
volunteers will be included in the run and festivities if interested! Event Details Saturday August 8, 2026We are a CUPLESS event, so please bring your bottles/cups water refills + is supplying electrolytes to keep you hydrated! As much as we love our fur babies, NO DOGS allowed (except service animals) - thanks for understanding!7:00am - Group Run Check-inat: Runners Roost BoulderGive 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)! And to help ramp up the fun, we are partnering with for our face decorating, glitter station!8:00am-8:30am - Group Run Starts We will send runners out in waves every few minutes! Enjoy a casual 4.5 mile or 10k run with friends from the local run community!9:00-9:30am - Return from Group Run for the FestivitiesEnjoy food, beverages, and the Dirt Circus Expo!10:00am-12:00pm - Raffle, Expo, & Social ConnectionsGet excited for raffle
prizes from brand partners, race entries, and cool swag & apparel! We'll have brand booths and tables set up around when you return from your run, whatever distance you chose. Talk to race directors, learn about local races, mingle with friends, learn about running shoes and apparel products, and maybe test out some hydration and nutrition brands!Preorder Your Original Dirt Circus T-Shirt! Each city on the tour gets its own exclusive design—only available for purchase during registration! Don’t miss out on the Boulder edition, with preorders closing Sunday, July 19, 2026. Plus, explore even more Dirt Circus swag available for purchase at checkout and see more UltraSignup gear via the store link below. Routes What is Dirt Circus? Did you know that there are thousands of small local trail running events across the United States each year? Our goal is to connect runners with races and with one another, to highlight race directors, running stores, coaches, and the other local businesses that
make up the fabric of our trail running community. The best way we know how to do that is by going for a run together. This sport is a little wild and we like it that way, so come join the Dirt Circus with us.Meet with race directors, find your next event, run with friends, win prizes and more. Think of it as a live and in-person version of ultrasignup.com, but even more fun.Why a Circus? Once upon a time, ultrarunning looked a little different. The sport has its roots in pedestrianism, where people would gather under the big top and walk and run for sport. Bets were made, the limits were pushed, and popularity soared. So come entertain yourselves with us, under the metaphorical big top. UltraSignup Store Shop UltraSignup gear and apparel in the UltraSignup Store. Event's current local time: 2:13 AM MT