Sonoma Mountain, Mountain summit in Sonoma County, US

Sonoma Mountain is the highest summit of the Sonoma Mountains in southern Sonoma County, California, rising to 2,463 feet (751 m). Its eastern and northern slopes are densely forested with coast live oak, Garry oak, black oak, Pacific madrone, bigleaf maple and California laurel, while the drier western and southern slopes carry chaparral, grassland and oak savannah.

The mountain formed about 12 million years ago through tectonic movements and volcanic activity, rising from what was then Pacific Ocean seabed. These geological processes shaped the region's landscape into what exists today.

Jack London bought the 1,000-acre Beauty Ranch on the eastern slope in 1910 for $26,000 and called it, after his wife, the dearest thing in the world to him. His stone Wolf House burned before he could live in it; its ruins are protected in Jack London State Historic Park near Glen Ellen.

The North Sonoma Mountain Regional Park has more than 30 kilometers of trails on dirt paths with designated parking areas for visitors. Spring and fall offer the most pleasant conditions for hiking in the area.

From the peak, visitors can see both the Pacific Ocean to the west and the entire Sonoma Valley stretching to the east on clear days. This vantage point draws photographers and nature lovers seeking expansive views.