Mount Diablo and Castle Rock
Mount Diablo and Castle Rock

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Poppies
Poppies

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Windcaves
Windcaves

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Mount Diablo and Castle Rock
Mount Diablo and Castle Rock

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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 mountain's 3,849-foot summit to its beautiful wildflowers, extensive trail system, fascinating wildlife, and distinctive rock formations.

Park Information

Mitchell Canyon Visitor Center

Mitchell Canyon Needs a Facelift!

Take a Multimedia Tour

Audible Mount Diablo provides an audiovisual collection of the sights and sounds of Mount Diablo State Park.

Mount Diablo Spring Storm.jpg

Mount Diablo Interpretive Association

About Us

The Mount Diablo Interpretive Association (MDIA) is a non-profit, all-volunteer organization that assists the California Department of Parks and Recreation in maintaining and interpreting Mount Diablo State Park for its 700,000 visitors each year. Through education, sponsored activities, and publications, MDIA fosters appreciation and the enlightened use of Mount Diablo State Park. MDIA is proud to provide the resources necessary to keep the Summit Museum and Mitchell Canyon Visitor Center open throughout the year. In addition, one of MDIA’s key roles is coordinating the Volunteers in Parks, program, which trains and manages park docents, sponsors guided hikes, and helps maintain trails.

MDIA is always looking for dedicated volunteers to lead or help with various programs, outreach, and operations.

Check out our clothing, books, maps, and more. Every purchase supports MDIA's programs and activities.

Sign up for MDIA's e-newsletter

for updates about park events and opportunities to get involved.

Make a difference and donate to MDIA or become a member.