Sobrante Ridge Botanic Regional Preserve, Botanical regional preserve in Contra Costa County, United States

Sobrante Ridge Regional Preserve is a 277-acre regional park in Richmond, Contra Costa County, managed by the East Bay Regional Park District. Its habitats include oak and bay woodland, coyote brush scrub, open grassland, and stands of the rare Alameda manzanita. Trails are dirt fire roads and single-track paths.

The land was part of Rancho El Sobrante, a Mexican grant to Juan Jose Castro dated 1840 in one source and 1841 in others. Cutter Laboratories, a Berkeley pharmaceutical company, later raised horses and cattle here, using their blood to make diphtheria and tetanus vaccines. The German firm that bought Cutter in 1974 owned the site until a local construction company dedicated part of it to the East Bay Regional Park District in 1980.

The preserve connects several neighborhoods through its three entrances and serves as a green retreat for nearby residents. Visitors encounter well-marked paths that lead through different habitats, enabling daily interaction between people and the natural landscape.

The preserve is accessible through three different entrances and features a network of dirt roads and trails for hiking and cycling. Conditions are most pleasant during dry months when paths are easier to navigate and plant life is most visible.

The Alameda manzanita here is deemed extremely rare by the East Bay Regional Park District, which manages the preserve. The shrub grows among coyote brush scrub and oak/bay woodland on the 277-acre ridge, where hikers pass it on the dirt fire roads without recognizing it.