Dirt Circus - San Francisco

Dirt Circus San Francisco returns to the heart of San Francisco, California on June 6th, 2026, promising another day filled with community spirit and camaraderie among runners from all walks of life. This free event organized by UltraSignup aims to celebrate trail running culture in a unique way that brings together local races, run clubs, brands, and businesses under one big top. Participants can expect an engaging mix of activities including social runs on scenic trails, food stalls offering delicious treats, raffles with exciting prizes, and plenty of opportunities for networking.
The setting is San Francisco's lush green spaces and winding coastal paths, where the morning light casts a soft glow over the city’s iconic landmarks like the Golden Gate Bridge in the distance. The atmosphere buzzes with anticipation as runners gather to connect with each other and explore the beauty of trail running together. Community members will converge at San Francisco Running Company located in Mill Valley for check-in before setting off on their runs, making this a day full of shared experiences and mutual support.
Dirt Circus has been an integral part of the local racing scene since its inception, fostering connections between runners and businesses alike through annual gatherings that celebrate the spirit of trail running. Over the years, it has grown to include various run clubs such as Lake Merritt Joggers and Striders and Pinoy Runners NorCal, along with popular brands like adidas TERREX and La Sportiva. Each event not only celebrates individual achievements but also raises awareness for local causes supported by these partnerships.
The route of the Dirt Circus San Francisco 2026 is set within serene trails that weave through Mill Valley’s natural beauty. The course features a firm yet slightly soft terrain, ideal for both experienced trail runners and casual joggers looking to enjoy the scenery at their own pace. Participants can choose between two distances: a shorter 3.3-mile (5.3K) loop or an extended 4.5-mile (7.2K) route that offers more time to soak in the surrounding landscape.
Starting lines will be marked clearly, and runners are advised to expect minimal elevation changes throughout their chosen course. Aid stations will provide water refills from CUPLESS cups supplied by , ensuring hydration without adding waste. The weather conditions on race day typically feature mild temperatures around 15°C with a slight breeze blowing through the coastal region, creating comfortable running conditions even as UV levels reach "Very High" due to clear skies.

For those looking to join in the fun and support local initiatives, registration is easy via https://ultrasignup.com/register.aspx?did=133533. No fees are required for either distance option: Dirt Circus San Francisco 2026 offers a free entry experience across both the 3.3-mile (5.3K) and 4.5-mile (7.2K) routes.
Participants should plan to arrive at 247 Shoreline Hwy Mill Valley, CA 94941 for bib pickup on June 6th. Bib collection will take place between 7:00 am and the start time of 8:00 am when all paces are welcome to join in a group run through scenic trails near San Francisco Running Company.
Dirt Circus San Francisco returns once again on Saturday, June 6th, inviting runners from across California to celebrate trail running culture. Join us for an unforgettable day filled with community spirit and shared love of the sport under sunny skies over Mill Valley's lush landscapes.