Petaluma Speedway (Sonoma-Marin Fairgrounds)

Petaluma Speedway is a 3/8-mile dirt oval at the Sonoma-Marin Fairgrounds in Petaluma, California, about 40 miles north of San Francisco, that hosts motocross racing on scheduled event nights. MMX Racing, the Marysville promoter, brings its Saturday Under the Lights night races here, with practice in the late afternoon and racing after dark on a temporary supercross-style course.

This is an event venue, not a practice track. There is no open riding between event dates, so check the MMX Racing calendar for the next race night. Spectator tickets, pit passes, and race entries are sold at the gate, and pre-registration runs online through Trackside.