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Bay Area Ridge Trail
BART DSC0006 (4369418796).jpg
Tunnel to Alpine Pond at Russian Ridge Open Space Preserve
Length 550 mi (885 km)
Location San Francisco Bay Area, United States
Use Hiking, bicycling, horseback riding, birdwatching, environmental education
Waymark Yes, continuous shoreline trail around San Francisco and San Pablo Bays

The Bay Area Ridge Trail (Ridge Trail) is a planned 550-mile (890 km) multi-use trail along the hill and mountain ridgelines ringing the San Francisco Bay Area, in Northern California. Currently over 380 miles (610 km) have been established. When complete, the trail will connect over 75 parks and open spaces. The trail is being designed to provide access for hikers, runners, mountain bicyclists, and equestrians. It will be accessible through trailheads near major population centers, while the trail will extend into more remote areas. The first trail section was dedicated on May 13, 1989.


William Penn Mott Jr., the twelfth director of the National Park Service, is credited with sparking the idea for the Ridge Trail in a speech he gave in March 1987 at a state parks and recreation conference. While working for the East Bay Regional Park District in the 1960s, Mott's office was on a ridgeline in the East Bay, and the views from the office inspired his vision of a hill-and-ridge trail encircling the Bay and linking its communities. The plan would later attract bipartisan support, with George Miller joining Mott.

In May 1987, the Greenbelt Alliance held a meeting to strategize how to approach the San Francisco Water Department and convince them to open their watershed lands to the public; Mark Evanoff convened the meeting and Brian O'Neill, Superintendent of the Golden Gate National Recreation Area, proposed a potential strategy to pursue the goals outlined in the report by the President's Commission on Americans Outdoors. Later that year, a planning committee was formed with membership from nearly 40 public agency, recreation groups, and individuals. Eventually, this committee became the Bay Area Ridge Trail Council.

Dinesh Desai, a retired engineer, and Bob Cowell, a retired fire chief, completed the first hike of the Ridge Trail in 1999, despite its incomplete status. The pair followed existing trails and planned alignment where no trails existed, including a crossing of the Carquinez Strait by kayak.

Trail progress

The first two segments of the trail, on lands in San Mateo County managed by the Midpeninsula Regional Open Space District and the San Mateo County Department of Parks, were dedicated on May 13, 1989. Existing trails in public open spaces were incorporated into the Ridge Trail, enabling it to reach 100 miles (160 km) by 1990 and 200 miles (320 km) by 1995.

By 1999, 217 miles (349 km) of the Ridge Trail had been completed, mainly on public lands. 10 miles (16 km) of the Ridge Trail were added in 2005, including a new bridge over San Geronimo Creek; at that point the Ridge Trail had completed 285 miles (459 km). The section of Ridge Trail through Crockett Hills Regional Park in Contra Costa County, which opened in June 2006, pushed the trail past the 300-mile (480 km) mark.

As of 2020, the Ridge Trail stands at 383 miles (616 km) completed. The section of the trail that runs through San Francisco has been completed, and parts of the SF trail have been rerouted to pass through more green space and over Twin Peaks. Large sections of the trail through San Mateo, Marin, Contra Costa and Alameda counties have been completed. Much of the remaining mileage is on private property in Santa Clara, Sonoma, and Napa, and may require land acquisition and/or easements to expand the trail across these properties.


Bay Area Ridge Trail Shield
Trail marker for Bay Area Ridge Trail

Starting at the Golden Gate Bridge and proceeding clockwise, the current and planned alignment of the Ridge Trail takes it through every Bay Area county: Marin, Sonoma, Napa, Solano, Contra Costa, Alameda, Santa Clara, Santa Cruz, San Mateo, and San Francisco counties. The planned alignment of the Ridge Trail extends as far north as Calistoga and Angwin, and as far south as Gilroy.

San Francisco City and County

From south to north, the trail passes through:

  • Lake Merced
  • Stern Grove
  • Twin Peaks
  • Buena Vista Park
  • The panhandle of Golden Gate Park
  • The Presidio
Ridge Trail segment status (as of 2015)
County Completed length of segments Final planned length of segments
Marin 62 miles
(100 kilometres)
72 miles
(116 kilometres)
Sonoma 29 miles
(47 kilometres)
50 miles
(80 kilometres)
Napa 18 miles
(29 kilometres)
80 miles
(130 kilometres)
Solano 30 miles
(48 kilometres)
50 miles
(80 kilometres)
Contra Costa 43 miles
(69 kilometres)
49 miles
(79 kilometres)
Alameda 36 miles
(58 kilometres)
56 miles
(90 kilometres)
Santa Clara 83 miles
(134 kilometres)
190 miles
(310 kilometres)
San Mateo 44 miles
(71 kilometres)
65 miles
(105 kilometres)
San Francisco 15 miles
(24 kilometres)
20 miles
(32 kilometres)

Bay Area Ridge Trail Council

The Bay Area Ridge Trail Council (BARTC), founded in 1987, is the organization working on the Ridge Trail. BARTC initially was supported by the Greenbelt Alliance, but incorporated in 1991 as a 501(c)(3) nonprofit under co-chairs Brian O'Neill and Marcia McNally. They partner with governments, nonprofit land trusts, and volunteer organizations in all nine Bay Area counties to help protect and preserve open space and plan, construct, and promote the Ridge Trail. The Council office is located in The Presidio, San Francisco.

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