Sanborn County Park, County park in Santa Clara County, California.

Sanborn County Park is a protected landscape in the Santa Cruz Mountains covering thousands of acres of natural terrain. Multiple trails wind through mixed forests dominated by second-growth redwoods and connect different areas of the park.

The property was developed in its early years by Judge James R. Welch, who built a mansion on the land in 1908. The building later served a different purpose and became part of the park's modern history.

The grinding slab used by the Ohlone people forms half of the entry gate to the log mansion on site, built in 1908 by Judge James R. Welch. The house later housed the Sanborn Park Hostel from 1976 to 2010, run by volunteers who charged $14 a night, the lowest hostel rate in the United States at its closing.

Enter from Saratoga by taking Highway 9 west for two miles, then turning left onto Sanborn Road for one mile to the entrance. No entry is allowed after sunset, and fees are collected at all times. Camping and RV use are limited to designated spots, and pets must be leashed. Only a small portion of the park has picnic tables and lawn, and most facilities are not wheelchair accessible, though an all-access trail starts at the visitor center.

The San Andreas Fault formed the steep-sided Lyndon Canyon that the Black Road trail follows high along its flanks. The fault's trace is a detail to look for on the ground rather than a place to stand between plates. The park's first segment of the Bay Area Ridge Trail, which becomes the Skyline-to-the-Sea Trail, also begins here.