Mount Thayer, Mountain summit in Santa Clara County, California, US.
Mount Thayer is a summit in the Santa Cruz Mountains rising 3,479 feet (1,060 m) with steep slopes dropping on all sides. An abandoned structure sits at its peak, visible from surrounding areas.
The mountain was home to Almaden Air Force Station during the Cold War when it served as a military outpost. The facility was decommissioned over time, leaving behind the ruins visible today.
Located in Sierra Azul Open Space Preserve, Mount Thayer stands as a representation of California's military defense infrastructure from the twentieth century.
The summit is closed to public access with no maintained pathways to reach the top. Visitors can view the mountain from the surrounding areas of Sierra Azul Open Space Preserve.
Mount Thayer ranks as the second highest point in the Sierra Azul Open Space Preserve, positioned one mile west of Mount Umunhum.
Location: California
GPS coordinates: 37.16368,-121.91943
Latest update: December 14, 2025 12:20
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