Hollister Hills SVRA is a 6,800-acre SVRA park and was the first SVRA made by the California parks department. The park is divided into three parts, the Upper Ranch, Lower Ranch, and Hudner Ranch. The Lower Ranch is for dirtbikes. While the Upper Ranch and Hudner Ranch are for 4x4s, visitors should stop first at the ranger station in the Lower Ranch to pay the $5 entry fee and get a map of the trails, as well as the lock combination to the gate at Hudner Ranch.
White Rock is a moderately difficult trail in the Hudner Ranch portion of Hollister Hills SVRA. It is one of the longer trails in Hudner Ranch and is composed of multiple tight turns, steep hill climbs, loose dirt, and narrow trails. Any 4WD or AWD vehicle with high clearance will be able to complete the trail. It is a great trail for new offroaders to learn and test the limits of their vehicle. There is no camping directly off of the trail, but there are campsites available in nearby Hudner Ranch that require a prior reservation.