Mt Diablo

This mountain state park is a total of 19,000 acres of oak woodland, grassland and chaparral with knobcone, digger and Coulter pine as well as wildflowers. It has a 3,849 foot summit. There is an extensive trail system for hiking, bicycles adn horseback riding with wildlife and sandstone rock formations and small caves and fossils.


Dogs must be on a leash under your control at all times. Dogs are not allowed on trails. Alcoholic beverages are prohibited. Always yield to hikers and horseback riders.

Operating Hours

Gates open 8:00am and close at sunset.  The Summit Visitor Center that includes a museum and art gallery is open 7 days a week from 10 am to 4 pm.


There is some free off road parking with access to some of the trails.  Otherwise, the main, Mitchell Canyon and Macedo Ranch entrances have discounted fees for adults age 62+. Alternatively there is an annual day use parking pass.

Disabled Access

The Visitor Center and some picnic areas are wheelchair accessible.


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N Gate Rd and Summit Rd

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Contact Info

Phone for general information: 925-837-2525 and for weather conditions: 925-838-9225