Mount Diablo is an Eastern Diablo Range Mountain at the South San Francisco Bay Area of Contra Costa County. The Clayton is south-east, and the Danville is north-west. The upthrust elevation is located at 1,173 m (3,849 meters) from the San Francisco Area. Mount Diablo seems to be in a number of ways a double pyramid which consists of several secondary peaks, one of which is closest and tallest, the North Mountain (1084 m), which is nearly as high at 3557 ft., and about 1 km northeast of the main mountain. Mount Diablo is a 20,000 ha State Park in Contra Costa County, in the San Francisco Bay Area. The park preserves Mount Diablo – an immense peak just 1,173 m high, yet with fantastic views over the city from its tip, which can be seen on clear days from 181 miles north. Mount Lassen is protected by the park.


Mount Diablo was believed to be the original site for the Miwok People for many Americans. Signs of native American occupation are still seen in Rock City and elsewhere on the mountain with molding manipulation in the dirt, suggesting that the Miwok once spilled corn and other noodle into sand. In 1851 Colonel Leander Ransom decided to start at the southern end of the mountain in the Western US map. The range played a major role. More surveys in many California, Oregon and Nevada were undertaken at this stage.  The development of the mountain began in 1931 when the state bought land on the shore of the lake and there was a park. The Civil Conservation Corps changed the city in the 1930s, adding sidewalks, parks, guard rooms, structures for maintenance, camping sites and picnic areas. The Summit Visitor Center was also built using pinnacle. Now, in the natural building material, visitors can see shells and other fossils. The day after the Pearl Harbor attack on 8 December 1941, the light on Mount Diablo was turned off to discourage attackers from using the light. A celebration, with overhead jets and dignitaries, took place at the center of the guest on Mt. Diablo on December 7, 1964. The goal was to re-enable the sun. The last sleeping admiral in the US navy, Admiral Chester W. Nimitz, was issued with the screen-flipping turn. The sun is only once a year on the night of 7 December. In 1971 a drive to expand and defend the mountain from development was launched to begin the Save Mount Diablo movement. The park has since expanded by 6,788.

Mount Diablo, which was formed about one million years ago, is quite a young geological region. The mountains created an ever higher height, which moves the mountain more strongly every year by 3-5 mm, among converging earthquake problems. The mountains at the top and bottom are composed of greenstones, an igneous material of 90–190 millions of years of age. At the mountain's sides are larger sandstone deposits deposited in old sea beds, sunsets and fossils.

This amazing park is located near the following parks in Danville, California:


  • Las Trampas Regional Wilderness

  • Danville South Park

  • Diablo Vista Park

  • Hap Magee Ranch Park

  • Osage Station Park

  • Sycamore Valley Park

  • Oak Hill Park


After finishing your visit make sure to stop by our offices located at 2010 Crow Canyon Place, Suite 100, in San Ramon!