South of San Jose and southwest of Hollister, the Hollister Hills State Recreation Area in the Gabilan Mountains has two large ATV riding areas, Lower Ranch and Upper Ranch.
The Upper Ranch - This 800-acre area, which has about 24 miles of trails, is used for 4-wheel drive recreation and for 4-wheel drive and motorcycle special events; a fenced motocross track is also located here. Four-wheel drive operators should call before coming, especially on weekends, to make sure that the area isn't reserved for a special event. To use the area for the day, register first at the park office. If your vehicle gets stuck or breaks down, you are responsible for removing it. The Upper Ranch may be accessed for day use from 8 a.m. to sunset. Vehicle operation is allowed only between sunrise and sunset.
Camping - The Upper Ranch has one family campground, Sycamore, which accommodates about 60 people, and has water and flush toilets. Fires are allowed in fire rings only. Bring your own wood or purchase it at the park store. The Lower Ranch has 4 family campgrounds with water and flush toilets. Dogs must be kept on leashes at all times.
To reach the ATV riding trailhead for Upper Ranch from Hollister, head south on SR25 to Cienega Road. Head south on Cienega Road for 6.5 miles to the ranger office.
Overall, Upper Ranch is the 91st most popular ATV riding trail of all 106 ATV trails in California.