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 video media player

Wildflower Identification Guide

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These are all great ways for you to support Mount Diablo State Park

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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 supporting the “Volunteers in Parks,” program, which trains and manages park docents, sponsors guided hikes, and helps maintain trails.

New Online Wildflower Identification Guide

Mount Diablo Globe Lilies are blooming!

MDIA’s new online wildflower photo guide is intended to help you identify the wildflowers that you may see in Mount Diablo State Park throughout the blooming season. The wildflowers are categorized by color and are listed in alphabetical order by common name of the plant.

This guide is a work in progress, conceived and maintained by volunteers. More wildflowers, photos, and information about the plants will be added as the wildflower season progresses and volunteer time permits.

The online guide can be accessed either by clicking the flower on the left, navigating the menu via Park Information > Nature > Plants > Wildflower Identification Guide, or using this link: Wildflower Identification Guide
If you have questions or comments about the contents of the guide, please email: info CAPTCHA graphic

Support California’s State Parks with a Specialized License Plate

st8 park platePlease consider using your vehicle to promote the preservation and restoration of California’s state parks.

Order a specialized license plate featuring California’s official tree, the California Redwood. Proceeds from the sale and renewal of the plate will provide an ongoing funding source for state parks across California.

There must be 7,500 prepaid orders by May 18, 2017, for the Department of Motor Vehicles to begin implementation of this special license plate program.
Questions? Call (916) 653-1010 or e-mail This email address is being protected from spambots. You need JavaScript enabled to view it.

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

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.

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
This email address is being protected from spambots. You need JavaScript enabled to view it. .