Purisima Creek Redwoods Open Space Preserve, Nature reserve in San Mateo County, California, US.

Purisima Creek Redwoods Open Space Preserve is a large forest conservation area in the coastal mountains with coast redwoods and hardwood forests. An extensive network of walking paths runs through the land, connecting different forest types and elevation zones.

The preserve was established with a $2 million gift from the Save the Redwoods League, protecting 4,471 acres (1,809 ha) on the western slopes of Kings Mountain in Woodside. It is now part of the Midpeninsula Regional Open Space District, which spans over 50,000 acres in the San Francisco Bay Area.

The preserve lies on the western slopes of Kings Mountain above Woodside, and its trails lead to viewpoints over Half Moon Bay. The Redwood Trail is wheelchair accessible, while dogs are not permitted anywhere in the preserve, as in many California parks. Bobcats, mountain lions, coyotes and rabbits live among the redwoods, tanoaks, madrones and Douglas firs.

The main entrance is located in the southern hills, with parking right at the start of the paths. The area is open year-round, though the ground can be slippery after rain.

The terrain features steep elevation changes, with fog in the valleys and sunny ridges, creating dramatic temperature shifts during a single walk. This geographic variation creates completely different forest types within short distances.