Diablo Range officially becomes a California conservation priority

By Laura Kindsvater, Senior Communications Manager, Save Mount Diablo

SACRAMENTO, CA—On August 13, the California legislature did something historic when they recognized and approved the Diablo Range as an official California conservation priority deemed critical to helping the state meet its 30×30 initiative to address the climate crisis.

Last year, Save Mount Diablo sponsored an Assembly Concurrent Resolution (ACR), authored by Assemblymember Rebecca Bauer-Kahan, officially recognizing the Diablo Range as a California conservation priority.

Assembly Concurrent Resolution, ACR 107, was reviewed and approved by the Assembly Committee on Water, Parks, and Wildlife on September 10, 2025, after we provided testimony to the committee addressing the need for the resolution.

Our Diablo Range resolution then went before the Assembly, where it was reviewed and approved on September 13, 2025.

On June 9, 2026, we provided testimony in support of ACR 107 to the Senate Natural Resources and Water Committee, and thereafter they approved our Diablo Range resolution.

Then on August 13, 2026, the Senate approved ACR 107 unanimously (33-0). With that final approval, our Diablo Range resolution was adopted, thereby officially recognizing the Diablo Range as a California conservation priority critical to helping the state meet its 30×30 initiative.

Introducing the resolution to the Senate floor for a vote, Senator John Laird remarked, “On behalf of Assemblymember Bauer-Kahan, I rise with alacrity to present ACR 107 . . . which recognizes the importance of the Diablo Range, one of California’s most significant overlooked natural landscapes. This covers 4 million acres, 12 counties, some of which I represent. It was a trivia question at the Senate Democratic Caucus, and not many people knew where the Diablo Range was. Now they do, because this resolution celebrates the ecological, historical, and economic significance of the Diablo Range and encourages continued stewardship of the landscape.”

The Diablo Range is over 200 miles long, contains more than 4 million acres that are largely intact and undeveloped, and is less than 30 percent conserved. And this mountain range runs through 12 counties, with Mount Diablo in its northernmost county of Contra Costa.

The Diablo Range is an immense and important wildlife habitat corridor, teeming with biodiversity. It is home to hundreds of rare and endangered species, such as the California condor and blunt-nosed leopard lizard.

More than 10 million people reside in communities immediately surrounding the Diablo Range, so protecting more lands and creating more parks within the range has been identified as a fantastic way to help more people get access to nature.

The Diablo Range provides California with one of its best opportunities to meet multiple goals in its 30×30 initiative set up to help the state address the climate crisis.

California’s 30×30 initiative aims to conserve 30 percent of the state’s lands and coastal waters by 2030, promoting biodiversity, climate resilience, and access to nature.

We thank Assemblymember Rebecca Bauer-Kahan; Senator John Laird, who gave ACR 107 a great introduction on the floor of the Senate before the Senate vote; and the rest of the California legislature that approved our Diablo Range resolution.

We also give thanks to our Save Mount Diablo team who worked hard on this historic effort, including a small group of staff, Board members, and leadership donors to our Diablo Range Campaign.

Further, we thank our legislative advocate, Douglas D. Houston, and his team at Houston Magnani and Associates who assisted us throughout this process. Finally, we thank all our partner organizations, agencies, and supporters who sent ACR 107 support letters to the legislature.

The California legislature’s historic approval of our resolution has just given much needed visibility, attention, and momentum to protecting the previously little-known, yet hugely important, Diablo Range.