Dirt Circus - San Francisco

Dirt Circus - San Francisco

Dirt Circus is a free community event organized by UltraSignup that highlights local races, run clubs, brands, and trail-running businesses. The one-day festival in Mill Valley / San Francisco includes a social group run, an expo area with brand booths, food, and a raffle.

A group run meets at the San Francisco Running Company. Participants can choose between these casual route options:

• 3.2 mi group run
• 4.5 mi group run

The event features vendor booths from running brands and local partners, product demos, and opportunities to speak with race directors and coaches. Onsite vendors listed include adidas TERREX, La Sportiva, On, and others. Attendees may receive an UltraSignup branded Shoe Bag Lite at check-in while supplies last, and there will be a face decorating and glitter station.

This is a CUPLESS event, so participants should bring their own water bottles or cups for refills. Dogs are not allowed except for service animals. Parking is limited; on-site parking at San Francisco Running Company has 40 spaces, additional parking at Peace Lutheran Church has 50 spaces, and two alternative lots offer roughly 50 and 30 spaces each with a short walk to the store.

Preorders are available for a city-specific Dirt Circus T-shirt with a preorder deadline of May 10, 2026. Visit the organization's website for the most recent information.