Sibley Volcanic Regional Preserve

 Camping is OPENClick here to make reservations for Backpack Camping.

Hazardous Trees Removal
Monday December 6th, 2021 through Friday, December 10th, 2021, access to the Round Top Service Rd from the water tank at Round Top and the adjacent section of the Skyline National Trail/Round Top Loop Trail will be CLOSED for hazardous trees removal. The detour to access the Bay Area Ridge Trail and continuation of Skyline National Trail into Huckleberry is by hiking the Round Top Loop Trail all the way around clockwise from the upper Quarry Trail Road.

Trail & Staging Area Closure Notices
The Wilcox Station Staging Area and McCosker Loop Trail will be CLOSED for construction, from June 2020 to Spring 2023, for creek restoration and public access enhancements. The project restores over 3,000 feet of creek habitat, including daylighting 2,800 feet, previously culverted underground.

Park Info

6800 Skyline Blvd.,
Oakland, CA 94611

Phone Number
Toll Free: 888-EBPARKS (888-327-2757), option 3, extension 4554

Park/Gate Hours
Nov.-Feb.: 7am-6pm
Mar.-Oct.: 7am-10pm

Park Entrances
Huckleberry Staging Area
Old Tunnel Road Staging Area
Sibley Main Staging Area

Parking: No fee
Dogs: No fee

> Trail Map
> Park Map [PDF]
> Google Map
> Transit & Trails

About The Park

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.

Wild Plant Guides

Round Top, one of the area's highest peaks, is made up of lava and volcanic debris left over from a 10-million-year-old volcano. During the past 10 million years, massive tectonic forces on the Hayward and Moraga earthquake faults uplifted the Berkeley hills, folding bedrock formations and tilting the Round Top volcano complex on its side.

Softer sedimentary rock from the Orinda Formation eroded away, exposing the Round Top volcano. In addition, quarrying in the north half of the preserve has revealed cross sections of the bedrock geology, providing an unsurpassed outdoor laboratory for studying volcanism in the Central Coast Ranges.

Park Features

Round Top (elevation 1763 ft. above sea level) is the preserve's most prominent feature.

The unstaffed visitor center at the Skyline Boulevard staging area has displays illustrating the preserve's geology. A self-guided brochure is available at the staging area highlighting the preserve's geological features.

Several trails provide access throughout the preserve. The 31-mile East Bay Skyline National Recreation Trail, part of the Bay Area Ridge Trail system, traverses the preserve along the ridgeline between Wildcat Canyon and Anthony Chabot Parks. Round Top Road goes from the Sibley visitor center to the top of Round Top. Round Top Loop Trail circles Round Top peak.  Volcanic Trail, once a quarry haul road, contains most of the stops on the self-guided volcanic tour.

From Old Tunnel Road on the northwest side of the park, the paved Quarry Road ascends and meets the east end of Volcanic Trail. Quarry Trail connects the middle of Volcanic Trail to a point lower down on Quarry Road. Finally, Pond Trail is a short trail segment that descends to a couple of ponds on the north side of the preserve.

Park Activities

Most trails are hiking and equestrian only. A few trails are multi-use. Dogs are permitted at Sibley, but are not allowed on adjacent Huckleberry trails. A visitor center at the park shelves self-guided tour brochures so guests can stroll the park and learn of its historic significance at their own leisure.

Bicycles are not allowed on narrow-gauge trails, except on the Skyline Trail between the Sibley visitor center and Old Tunnel Road. Bicycles are allowed on the wider-gauge fire trails and paved roads, but are not allowed on Round Top Road from the fork .15 mile east of the visitor center to the top of Round Top.

ADA accessibility iconPark Accessibility

Round Top Road is paved to the top of Round Top. (Watch for occasional vehicles using the road.) There is also a 600-foot, paved wheelchair path north of the visitor center that ends at a viewing platform. Quarry Road, beginning at Old Tunnel Road, is also paved.

To Reach The Park

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 .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. From Lake Merritt BART, 19th Street BART, or Rockridge BART take AC Transit bus 59 or 59A; these bus lines go to the Montclair Transit Center. From there, transfer to AC Transit bus 305 and exit at the stop on Colton Boulevard and Ridgewood Drive. Walk the short distance from Colton to Skyline Boulevard, turn left and proceed to the preserve. It is a mostly level, 0.9-mile walk that passes the Huckleberry Preserve staging area.

Please call AC Transit 511 (TDD (hearing impaired line)/TTY: 1-800-448-9790) or visit to confirm transit information.

Transit & Trails :  Sibley Volcanic Regional Preserve  (transit, biking, and walking directions)

Trail Map

Click the map image below to see an enlarged version.

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General work description
Work to be done generally consists of replacing a damaged Corrugated Metal Pipe (CMP) with a Reinforced Concrete Pipe (RCP) and repairing the CMP using invert paving. The pipe invert will be filled with concrete reinforced baffles for fish passage. Work will also include temporary water diversion and dewatering, reconstructing of the roadway and roadside ditch, replacing roadway striping, and reconstructing and stabilizing the embankment using rock slope protection.

County Resident Engineer Contact Information:
Steve Patterson
Park Engineering
  M: (510) 701-0319

Project Name: Pinehurst Road Sinkhole and Culver Repair Project
Construction Contractor W.R. Forde
Construction Start Date: August 30, 2021
Anticipated Completion: October 30, 2021
Resident Engineer: Steve Patterson
  (510) 701-0319
Contra Costa County Public Works Project Manager: Adelina Huerta
  (925) 313-2305


Tuesday, November 30, 2021 (Today)

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