Just a mile south of San Francisco, San Bruno Mountain is one of the largest public open spaces in urban America. Our programs conserve and nurture the mountain's unique ecosystems - home to 13 rare and endangered plants and three federally listed endangered butterflies.
Join this great group of dedicated plant lovers every Wednesday - there's always room for more!
Join the SSF Weed Warriors for another special day on the mountain's sweeping grasslands! Enjoy late-season wildflowers while removing invasive plants.
Explore San Bruno Mountain's less-traveled canyons and learn about their history and ecology on this docent-lead hike. Paul's hikes are one of our most popular events!