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.
Tarantula Hike Information
This is the time of year that tarantulas can be seen in the park. To get a great introduction too these interesting creatures and perhaps meet one up close, sign up for a tarantula hike on our events calendar.
Tarantula hikes are listed on the events calendar of the MDIA website.
For hikes that require reservations, please make sure each individual signs up separately so we can keep an accurate count.
Please check hike description for difficulty and any age restrictions. Some programs involve more talking and a longer hike. Make sure the program you reserve for is appropriate for you.
Unless indicated in a hike description, no waiting list is maintained. Hikes fill up quickly.
If you cannot attend a hike you have registered for, please let the hike leader know as soon as you can, so others may attend
In addition to the Mitchell Canyon Tarantula hikes, naturalist Michael Marchiano offers drop-in tarantula programs at the Summit Museum. These programs do not require reservations and are open to all, including organized groups. Check the events schedule for dates.
Try MDIA's New Online Store, Powered by Square
MDIA has launched a convenient new online store powered by Square. The new store can be accessed by selecting the button labeled "Online Store" at the top of each page of this website. The new store is easy to use with an improved checkout process. Be sure to check out the new Hiker’s Guide of Mount Diablo State Park as well as the Trail Map, MDIA memberships, and much more merchandise in this new store. Remember, the money you spend on merchandise from MDIA is used to support important programs at Mount Diablo State Park.
Hiker’s Guide to Mount Diablo State Park is now available!
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.
Click here to order directly from MDIA's online store, or 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:
ALL VISITORS ARE ENCOURAGED TO BRING WATER FOR CONSUMPTION DURING THEIR VISIT.
If you are planning a long hike, run, walk, bicycle ride or horseback ride, please bring plenty of water to ensure a safe and enjoyable visit. It is not unusual for heat-related illnesses (heat cramps, heat exhaustion and heat stroke) to occur at Mount Diablo State Park during the late spring, summer and early fall seasons. Although many of these illnesses can be treated without hospitalization, some heat related illnesses have proven fatal to park visitors in the past.
By taking the necessary precautions, the vast majority of visitors enjoy a safe and memorable visit to Mount Diablo in all seasons.
Mary Bowerman Trail Is Open
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.
Rock City Audio Tour Is Now Available
Listen to our newest audio tour, a 1.6-mile walk exploring the history, geology, and plants of Rock City, one of the most popular places in Mount Diablo State Park. Also included is an audio portion describing the close relationship between the community of Diablo, the park and some of Californias most important historical figures. To listen, please click on this link or the link at the bottom of this page.
This tour has been made available through sponsorship by MDIA and the Diablo Country Club.
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!