AllTrails
Castle Rock Trail to Saratoga Gap Trail and Ridge Trail Loop
Great views, challenging hiking in the hills southwest of Silicon Valley. With lush woods, gorgeous vistas, challenging trails and remarkable stone formations, Castle Rock State Park is a highlight reel for hiking in the San Francisco Bay Area. You'll find a fascinating mix to trees -- gnarled oaks, towering Douglas firs, bark-shedding madrones -- but the rocks steal the show. Large formations called "tafoni" (which look like the work of honeybees on steroids) formed over eons as weathering processes gradually reshaped the stone. Castle Rock is the most notable tafoni formation, but there are many more in the park.
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