San Bruno Mountain is the northernmost part of the Santa Cruz Mountains in San Mateo County, California, It is adjacent to the southern boundary of San Francisco, surrounded by the cities of South San Francisco, Daly City, Colma, and Brisbane. Trails to the summit afford expansive views of the San Francisco Bay Area.
The mountain stands as a unique open-space island that provides habitat for several species of rare and endangered plants and butterflies, in the midst of the San Francisco Peninsula’s urbanization.