A large and varied number of volunteer activities take place all year long at San Bruno Mountain Park as part of the Parks Department's Volunteer Program. Individuals, groups, families and organizations can take part in trail construction, plant maintenance, visitor services and other beneficial and rewarding projects. Special activities are held each year for Earth Day, Habitat Restoration Day and California Trails Day.

San Bruno Mountain Watch is a nonprofit organization dedicated to stewardship, interpretation, and protection related to the mountain. They offer guided hikes, and regular volunteer opportunities at beautiful sites and their native plant nursery. If you are an individual or an organization interested in getting involved in volunteering, please contact San Bruno Mountain Watch or the San Mateo County Parks Volunteer Program.