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.

What is that plant?

Find it here!

The Mount Diablo

Check out the

What's Blooming Now?


Get Involved

MDIA encourages the public to join our organization and become involved in its mission to support the park. We are always looking for dedicated volunteers to lead or help with various programs, outreach, and operations.

Audio Tour

The Audible Mount Diablo audio tour features lively interviews and music with the rush of the wind and the chirps, howls, and growls of wildlife—all downloadable to your computer or cellular device.


MDIA hosts a variety of hikes and talks throughout the year and is now offering webinars as well. View our events page and register for upcoming activities.

Online Store

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

Welcome to the Mount Diablo
Interpretive Association Website

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 the Parks Program, which trains and manages park docents, sponsors guided hikes, and helps maintain trails.

This beautiful full-color book features comprehensive descriptions and stunning photographs, along with helpful maps and profiles for 50 hikes in the park including several new hike ideas.

Summit Nature Programs

Nature Presentations are at the Summit with Naturalist experts. No reservations required. 2020 schedule coming soon.

Sign up for MDIA's e-newsletter

for updates about park events and opportunities to get involved.

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© 2020 by Mount Diablo Interpretive Association