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Peregrine Nesting Area Closures in Effect 020125 Donate Subscribe Listen Shop About Us Park Information Activities Nature Events Nature Guides Support More Mount Diablo State Park is one of the ecological treasures of the San Francisco Bay Area. Every season in the park has its special qualities. Discover them for yourself from the mountain39s 3849foot summit to its beautiful wildflowers extensive trail system fascinating wildlife and distinctive rock formations. Download the Mount Diablo State Park brochure or seePark Information We acknowledge that Mount Diablo is the ancestral home since time immemorial of the Wilton Rancheria Bay Miwok Confederated Villages of Lisjan Northern Valley Yokuts Muwekma and Ohlone peoples.