Petaluma Adobe State Historic Park is open daily from 10 a.m. to 5 p.m.
The park is also closed on New Years Day, Thanksgiving Day, and Christmas Day.
There are admission fees to visit the park, the fees are $3.00 for adults, $2.00 for children between 6 and 16, and children under 5 are free. The paid admission is also good, on the same day, at Sonoma State Historic Park (which includes the Barracks, Mission San Francisco Solano, and the General Vallejo Home) in Sonoma.
The park is located at 3325 Adobe Road in Petaluma
From Marin, San Francisco Bay Area, and East Bay
Take Highway 101 north to Petaluma. Take the East 116, Sonoma-Napa exit, stay to the left. Go left on Lakeville and follow for just over half of a mile to Casa Grande Road. Turn left at Casa Grande and follow for almost 2 miles to Adobe Road. Turn right on Adobe Road at the stop sign, the park entrance will be on your left-hand side.
From all points north of Petaluma
Take Highway 101 south to Petaluma. Take the E. Washington Street exit, stay to the left. Turn left on Washington Street and follow for 2 miles to Adobe Road. Turn right on at the stop sign at Adobe Road and follow for almost 2 miles to the park entrance, which will be on the left. If you go too far, you will reach another stop sign at Frates Road-turn around.
From Vallejo, East Bay or Highway 80 (via Vallejo)
From Highway 37 go right on Lakeville Highway. Turn right on Frates Road. Turn left at stop sign at Adobe Road. The park entrance will be on your right-hand side about half a mile after turning left.
Go down Broadway-Highway 12 for almost 2 miles; turn right on Watmaugh Road. Left on Arnold Road at the stoplight, right on Highway 116-Stage Gulch Road at stoplight. Turn right on Adobe Road at stop sign. The park entrance will be on your right-hand side about half of a mile after turning right.