Audio Tours of Mount Diablo
Experience an Audio Tour Here
The tours feature lively interviews and music with the rush of wind and the chirps, howls, and growls of wildlife, all downloadable to an audio player.

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Welcome to the Mount Diablo Interpretive Association Website

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.

Castle Rock Area in Mount Diablo State Park to Close for Falcon Nesting Season

The area known as “Castle Rock” in Mount Diablo State Park will be closed to visitors from February 1 to July 31 to help protect the Peregrine Falcons during their nesting season. This is an annual closure, as the Peregrine Falcon is listed as a “Fully Protected Species” in California. This raptor is territorial and highly sensitive to disturbance during nesting season.
peregrine falcon area closed 2016California State Parks has partnered with East Bay Regional Park District, the operator of the Diablo Foothills Regional Park, which neighbors the closed area, to educate rock climbers and the general public of this closure and the importance of protecting the Falcon. Signs and educational panels are placed in the area to advise and educate users about the closure. 

Violators are subject to penalty by fine. Rock climbers will be encouraged to use an alternate climbing area of the park during the closure.

2015-01-22 Castle Rock Closure Nesting News Release

Hiker’s Guide to Mount Diablo State Park is now available!

hikers guide cover mdia-1
MDIA is pleased to announce that the much-anticipated Hiker’s Guide to Mount Diablo State Park has just arrived! 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. The Hiker’s Guide to Mount Diablo State Park strives to offer hikes that will be of interest to all park visitors, with distances ranging from less than half a mile, to a full marathon that circumnavigates the mountain.

Purchase at the Mitchell Canyon Visitor Center or Summit Visitor Center.
The March edition of East Bay's Diablo Magazine features three hikes from the Hiker’s Guide. Read Rachelle Cihonski’s take on these scenic spring hikes on Mount Diablo:

The Trail Through Time Audio Tour Is Now Available

New Multimedia Guide to Bay Area Geology linked to historic walk on Mount Diablo

The Trail Through Time  Audio Tour is a 6.3 mile walk from the top to the bottom of Mount Diablo through 190 million years of geologic history. Starting this month, you can enliven that hike with a multimedia guide produced by the Mount Diablo Interpretive Association. In the guide, MDIA naturalist Ken Lavin informs and entertains at 19 stops along the Trail Through Time route. Each stop is a short video segment you can download to your computer, tablet, or mobile phone to use at home or on the mountain.

Part one examines the ancient rocks at the top of the mountain—some of which have traveled 3,000 miles to get here. Part two introduces the younger rocks farther down. They date back to the times when dinosaurs and, millions of years later, saber-toothed cats and dire wolves roamed the Earth. Part three explains how Mount Diablo’s geologic secrets were discovered and how the Trail Through Time was built.

“This tour is not just for students of geology,” says MDIA president Mike Woodring. “It’s for people who want to understand how Mount Diablo and the rest of the Bay Area came to be—and what’s happening right beneath our feet today.”

The tour is part of the Audible Mount Diablo series, jointly produced by MDIA, Save Mount Diablo, and Audio Guides to the Outdoors. All 12 tours in the series are available free at and at the link on this page to the top left.

Mary Bowerman Trail Is Open

09/26/15mary- bowerman

The northern paved portion of the Mary Bowerman Trail is open again for visitor use. The Americans with Disabilities Act (ADA) upgrades have been completed, and the north
side of Summit Road near the beginning of the trail is now an ADA parking area. Come see the finished work.

Volunteer Opportunities

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. Volunteers can commit to as little as a couple of hours a week or volunteer on a project-specific, ad hoc basis and still provide vital assistance.(read more).
Citizen Scientists: Help Monitor Fire Recovery!
Check out the four camera stations along the Mary Bowerman (Fire Interpretive) Trail and other locations in the Morgan Fire burn area. Please take photos with your smart phone and upload them to social media. Our partner group Nerds for Nature will use the photos to create a time-lapse video of the landscape recovering and changing over the next several years. Please participate when you see the stations and be a part of studying the fire recovery. Contact Cyndy Shafer at
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