Cobb Mountain, Mountain summit in Lake County, California.

Cobb Mountain is a 1440-meter summit in the Mayacamas Mountains and the highest peak in this range. The area is heavily forested and features multiple hiking routes of varying difficulty.

The mountain was named after John Cobb, a pioneer who settled in the region in 1853 and served as a county assessor. His presence shaped the early development of the local community.

The name comes from John Cobb, a Kentucky-born settler who homesteaded Cobb Valley from 1853 and served as county assessor and road overseer for the Clearlake District in 1855. He built a combined saw and gristmill in 1859, later destroyed by fire, and sold his interests around 1860. The town of Cobb and the mountain carry his name.

Much of Cobb Mountain is privately owned, including geothermal plants, spring-water land and timberland, so the summit is largely not open to the public. There is no maintained public trail to the 4,723-foot main summit; access requires permission from the landowners. The Southwest Peak, on the Sonoma-Lake county line, is the highest point in Sonoma County.

The 2015 Valley Fire, the third-most destructive in California history, started on Cobb Mountain because of faulty hot tub wiring, according to Cal Fire. It killed four people and burned 76,000 acres, including much of the town of Cobb and several geothermal facilities.