Santa Rosa Mountains (California)

The Santa Rosa Mountains are a short mountain range in the Peninsular Ranges system, located east of the Los Angeles Basin and northeast of the San Diego metropolitan area of southern California, in the southwestern United States.

The Santa Rosa Mountains extend for approximately 30 miles (48 km) along the western side of the Coachella Valley within Riverside, San Diego, and Imperial Counties in Southern California. The range connects to the San Jacinto Mountains on its northern end, where the Pines to Palms Highway—California State Route 74, crosses them.

The highest peak in the range is Toro Peak (elevation 8,716 feet (2,657 m)), located approximately 22 miles (35 km) south of Palm Springs, just south of Route 74, and on the northeast side of Anza-Borrego's Upper Coyote Canyon. The Santa Rosa Mountains are also a Great Basin Divide landform for the Salton Sink Watershed on the east.

The southeastern reaches of the Santa Rosa Mountains were first noted by a non-native person during the 1774 Spanish expedition led by explorer Juan Bautista de Anza into colonial Las Californias through the Coachella Valley from the populated Viceroyalty of New Spain region (present day Mexico). 19th century maps of the region show the Santa Rosas as a southern extension of the higher northern San Jacinto Mountains. The name "Santa Rosa Mountains" first came into use by the USGS in 1901.

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