Thunderhill Raceway Park is a road racing course located West of
Willows, California on Hwy 162. The course is a fast series of twists and turns with minor elevation changes. Thunderhill is owned and operated by the
San Francisco Region of the
SCCA. It is host to many motorports events for
cars and
motorcycles. The SCCA uses Thunderhill for its automotive race competitions. The Northern California Chapter of the
AFM runs several motorcycle races there every year.