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 four federally listed butterflies.
Join a great group of dedicated plant lovers every Wednesday - there's always room for more!
Maintain a native garden with the Guadalupe Valley Stewards and help improve frog habitat!
Don't miss wildflowers on the south slopes! Join the SSF Weed Warriors for their restoration work on the Mountain's south slope – and get some exercise! The non-native invasives are a constant battle so we need all the weed warriors we can get! Only heavy rain would cancel - so come prepared. Friday and Saturday 9am to noon.