Mount Diablo, the 3,849-foot peak in Contra Costa County, draws an estimated 150,000 cyclists each year, many of whom attempt ...

Save Mount Diablo will expand its free Discover Diablo Hikes and Outings program in 2025, including into areas rarely open to the public. The Walnut Creek-based nonprofit conservation group's ...

Mount Diablo State Park will likely be on fire next ... Coulter Pine Trail, Eagle Peak Trail, and Mitchell Rock Trail. Other park roads, trails, and facilities outside of the burn area will ...