Diablo Range, Mountain range in eastern San Francisco Bay Area, California
The Diablo Range is a mountain chain east of San Francisco Bay made of sedimentary rock layers that rise up to 3,849 feet. The range displays a distinctive shape when viewed from different directions and covers a substantial area.
The range served as a key reference point for surveying operations during the 1850s across California. These surveys shaped boundary lines that extended into neighboring states to the east.
The mountain held deep meaning for the Ohlone people, who wove it into their creation stories and spiritual traditions. This place remained central to how local communities understood their relationship with the land.
The surrounding Mount Diablo State Park offers hiking trails, picnic areas, and a visitor center with geological displays. Plan to explore different routes depending on your interests and physical ability.
The rocks here formed during the Jurassic period in ocean depths and were pushed upward by tectonic forces over millions of years. You can see layers of stone that tell this dramatic story of earth movement.
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