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!
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!
Join us SUNDAY for a wildflower planting event at Owl Canyon! Help nourish the mountain's endangered Mission Blue and Callippe Silverspot butterflies.
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.
David Schooley, founder of San Bruno Mountain Watch, will lead hikes into Owl and Buckeye Canyons on the 4th Saturday of each month. Be sure to sign up early - space is limited!
Help restore and beautify the entrance of Costaños Canyon with a lovely mix of mountain plants! Join us on this fun planting day!