Sibley Volcanic Regional Preserve
There are about ten miles of trails including a trail leading up to Round Top (elevation 1763 ft.) that is made up of lava and volcanic debris left over from a 10-million-year-old volcano. Other trails pass through ridgelines and ponds. The visitor center offers a self-guided brochure for observing the local geology.
Open from 7 AM to 6 PM (winter months) or 10 PM (summer months).
Round Top and Quarry roads are paved and there is a 600-foot, paved wheelchair path north of the visitor center that ends at a viewing platform.
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Sibley staging area6800 Skyline Blvd
From Highway 24 take the Fish Ranch Road immediately east of the Caldecott Tunnel. Continue 0.8 miles to Grizzly Peak Boulevard. Turn left and go 2.4 miles on Grizzly Peak to Skyline Boulevard. Turn left and drive 0.1 mile to the preserve entrance on the left. The closest bus line, AC Transit #305, runs only on Tuesdays and Thursdays, from mid-morning to mid-afternoon.
Phone 1-888-327-2757 option 3, extension 4554.