Sibley Volcanic Regional Preserve

Oakland, Contra Costa County, CA

ParkingNo parking fee

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DogsLeash in developed areas

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Hours7 a.m.; closes 6 p.m. Nov–Feb, 10 p.m. Mar–Oct

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Size: 928 acres Source
Managed by: East Bay Regional Park District

About Sibley Volcanic Regional Preserve

An extinct volcano in the Oakland hills, one of the Park District's original parks. Source

East Bay residents have a volcano in their backyard at Sibley Volcanic Regional Preserve. Originally called Round Top Park, Sibley shares with Temescal and Tilden the distinction of being one of the East Bay Regional Park District's original parks. The preserve was later named in honor of Robert Sibley, who helped found the District and served for 10 years on its board of directors.

— Sibley Volcanic Regional Preserve, official page (checked Oct 15, 2026)

Know before you go

Sibley Volcanic Regional Preserve covers 928 acres in Oakland, Contra Costa County. 12 named trails add up to about 9 miles inside the park; the longest is Skyline Trail at 2.2 miles, and Skyline Trail has the most up and down (about 943 feet). Mapped trails range from 977 to 1,614 feet in elevation. OpenStreetMap shows 3 parking areas, including Sibley Volcanic Regional Preserve parking and Old Tunnel Road Staging Area, plus 3 restrooms and 1 drinking fountain. The closest mapped bus stop is Tunnel Road & Skyline Boulevard (routes 677), about 900 feet from the park.

Facilities

Camping
Drinking Water
Picnic Area
Restrooms

Facility details: OpenStreetMap

Sibley Volcanic Regional Preserve at a glance

PParking · 3: Sibley Volcanic Regional Preserve parking, Old Tunnel Road Staging Area
WCRestrooms · 3: Pit toilet
WDrinking water · 1
Named trails · 8

Trails

Trail	Mapped length	Elevation	Surface & uses
Skyline Trail	2.2 mi	943 ft up & down977–1,482 ft	UnpavedHorsesNo bikesPaved
McCosker Loop Trail	1.5 mi
Round Top Loop Trail	1.1 mi	342 ft up & down1,471–1,614 ft	UnpavedBikesHorsesNo bikes
Volcanic Trail	1 mi	249 ft up & down1,351–1,514 ft	UnpavedBikesHorses
Quarry Road	0.7 mi	333 ft up & down1,010–1,351 ft	PavedBikesHorses
Gudde Ridge Trail	0.7 mi
Quarry Trail	0.4 mi	185 ft up & down1,270–1,461 ft	UnpavedBikesHorses
Pond Trail	0.4 mi	136 ft up & down1,151–1,290 ft	UnpavedBikesHorses
Pacific Pea Trail	0.4 mi
Round Top Loop Trail (Bay Area Ridge Trail)	0.2 mi	23 ft up & down1,473–1,488 ft	UnpavedNo bikesHorses
Overlook Trail	0.2 mi	90 ft up & down1,397–1,492 ft	UnpavedNo bikes
Ninebark Trail	0.2 mi

How trail figures are measured

Getting to Sibley Volcanic Regional Preserve by bus

Tunnel Road & Skyline Boulevard · Routes 677 · 900 ft from the park
Skyline Boulevard & Broadway Terrace · Routes 677 · 1010 ft from the park
Broadway Terrace & Skyline Boulevard · Routes 677 · 1020 ft from the park

Stops within a quarter mile of Sibley Volcanic Regional Preserve; confirm times with the transit agency.

Compared with nearby parks

Among the 19 other parks in this guide within 10 miles, Sibley Volcanic Regional Preserve is number 8 of 20 by size at 928 acres. 6 nearby parks have more mapped trail mileage than its 9 miles.

Closest places for what Sibley Volcanic Regional Preserve doesn't list: