Pulgas Ridge Open Space Preserve

Pulgas Ridge Open Space Preserve is a public recreation area in the Santa Cruz Mountains, San Mateo County in northern California.

The nature reserve covers 366 acres (1.48 km2) with 6 miles (9.7 km) of trails with elevation changes of around 500 feet (150 m).

[1] The 293 acres (1.19 km2) that now comprise Pulgas were formerly a tuberculosis sanitarium owned by the City of San Francisco, the Hassler Health Farm.

Buildings were demolished in 1985, and most of the non-native plants have been removed, but there are still some old retaining walls and steps off Hassler Trail.

All trails are open to dogs, but leash rules apply except in the marked off-leash area.