Rancho San Antonio Open Space Preserve

Rancho San Antonio County Park and Rancho San Antonio Open Space Preserve are a conjoined public recreational area in the Santa Cruz Mountains, in the northwest quadrant of Santa Clara County, California. The County Park is bordered by Los Altos with some parts of the eastern part of the County Park in western Cupertino. The Open Space Preserve is on the west side of the County Park, also bordered by Los Altos Hills, Monte Bello Open Space Preserve, and the Permanente Quarry.

The Midpeninsula Regional Open Space District manages both the 3988 acre Open Space Preserve and the 289 acre County Park.This article covers both Rancho San Antonio County Park and Rancho San Antonio Open Space Preserve.