Mount Diablo State Park

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Daily: 8 am - sunset

Summit Visitor Center:
Daily: 10 am - 4 pm

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Wikipedia https://en.wikipedia.org/wiki/Mount_Diablo

Official Website https://www.parks.ca.gov/?page_id=517

Facebook https://www.facebook.com/CaliforniaStateParks

landingPages.LANDING_PAGE.DETAIL.COORDINATES 37°52'15.787" N -121°55'10.812" E