Our mission is to forever preserve the remaining natural lands on and around Mount Diablo, and to connect Mount Diablo to its sustaining Diablo Range.

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mountain biking near Mount Diablo

Hit the Trails: Mountain Biking

Come explore the beautiful trails and connectivity of Mangini Ranch and Lime Ridge Open Space via a mountain bike. Join us on June 4!

Explore the Trails with Us
people enjoying a hike at Mangini Ranch Educational Preserve

Our Preserve Is Now Open for Free, Group Use!

Request your reservation for your community or school group to enjoy Mangini Preserve. Hiking, mountain biking, yoga, environmental science classes, grief counseling support groups . . .

Learn More about Mangini Preserve
The Beacon at sunrise

Beacon Lighting on May 30

The Mount Diablo Summit Beacon will be lit on Monday evening, May 30, Memorial Day.

Beacon Lighting

Our Land Conservation Work


We protect natural lands through acquisition; cooperative efforts with parks, developers, and landowners; and conservative easements.

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We defend Mount Diablo and its foothills from threats of development through land use planning and advocacy.

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We restore habitats prior to transfer to public agencies for permanent preservation and public use.

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We help people enjoy Diablo's parks through events and educational and recreational opportunities.

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Lands protected by Save Mount Diablo between 1971 and 2022

Many Acres of Wild Lands Have Been Saved

Protected Lands from 1971–2022

In 1971, there was just one park on Mount Diablo. It consisted of only 6,788 protected acres, mostly around the peak. Working with partners such as California State Parks, Contra Costa County, the East Bay Regional Park District, local cities, the Coastal Conservancy, Contra Costa Water District, and others—we, together with the help of generous supporters like you, have pieced together a conserved expanse of Diablo wild lands that today is greater than 120,000 acres, an area bigger than Point Reyes National Seashore or the Golden Gate National Recreation Area.

Although we and our partners have had tremendous success at reassembling a large swath of the wild lands around Mount Diablo, there is still much work to do to save the remaining unprotected lands and allow our community to grow.

Protected Lands

Join us to save the remaining natural lands of Mount Diablo!

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