Directions Car - Pinnacles National Monument has two entrances: east and west. The west entrance can be reached via Highway 101 near the town of Soledad, then east along Highway 146 to the Chaparral area. The east entrance is reached via Highway 25, south of the city of Hollister and north of the town of King City, then west on Highway 146. The entrances are NOT connected by a road. It is not possible to drive through the Monument from one side to the other.
If you're not sure which side of the monument to visit, keep in mind that there is a variety of trails that start from either side. If you'd like to visit a cave, you'll probably want to go the west side to take the Balconies Cave Loop, which is two miles round trip. If you'd like to get views of the High Peaks without leaving your car, you can see the rock formations from the west parking area.
The road to the west side of the monument is winding and narrow, so if you're traveling in an RV, you'll probably want to enter the monument from the east.