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

calochortus pulchellus logo mjw

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Stargazing on Mount Diablo

Mount Diablo Observatory Association

The MOUNT DIABLO OBSERVATORY ASSOCIATION (MDOA) is dedicated to public education in astronomy. The organization includes scientists, engineers and other professional people, with a common interest in astronomy and a desire to further science education.


Mailing Address:
Mt. Diablo Observatory Association, Inc.
P.O. Box 3165
Walnut Creek, CA 94598-3165


The Mt. Diablo Observatory Association, Inc. (MDOA) is a cooperating organization within Mount Diablo State Park. Incorporated in 1988, MDOA members planned, raised funds and established an astronomical observatory.

The observatory consists of a Solar powered 96 square foot roll-off roof observatory, and a 500 square foot warming room. The heart of the observatory is a computer controlled Celestron 14, which has a variety of electronic attachments, a CCD camera, and photographic equipment. The addition of a refractor to the observatory has enhanced the photographic tasks and the public outreach of the observatory. A 15 Kilowatt generator provides all the electrical needs for lighting, heating, and AC for the comfort of our visitors in the warming room.

At nearly 3800 feet above the mean sea level, the observatory has an unobstructed view of the night sky (and Mount Diablo is the highest mountain within the San Francisco Bay Area with a public access observatory).

Every year MDOA and its sister organization, Mount Diablo Astronomical Society, operate Public Astronomy Programs under the sponsorship of Mount Diablo State Park. This program is now in its 28th year!

For written information, applications for Associate Membership ($15/year) to support the observatory or for other correspondence feel free to contact us by email, or in writing at:

Information for Visitors: 

Participate in hands-on astronomy activities followed by supervised observing through the many different telescopes of MDAS members.

Bring snacks, water, binoculars, and warm clothes. If you bring a flashlight please cover it with red material.

Please note that only Mt. Diablo Astronomy Docents may set up telescopes on Public Nights.

MDAS 2015 Public Programs (PDF, 115 KB)


Mount Diablo - Lower Summit Parking Lot off Summit Road - almost to the top of Mount Diablo
Summit Rd, Walnut Creek, CA 94598

P.O. BOX 3165
Walnut Creek, CA 94598

Mount Diablo Astronomy
Photo of the main telescope (Refractor not shown)

Mount Diablo Astronomy
Planetary Nebula, M 57 in Lyra. June 12, 2010

Mount Diablo Astronomy
MOON Photographed April 13, 2009

For more information on MDAS click here:
Mount Diablo Astronomical Society web site

Other astronomy links:
Western Amateur Astronomers

The material above is provided by Mt Diablo Observatory Association
and Mt Diablo Astronomical Society