The Midpeninsula Regional Open Space District is a regional greenbelt system in the San Francisco Bay Area comprised of over 60,000 acres of land in 26 open space preserves.

What's new?

Fall into Open Space! See what's happening in our preserves in the November e-news!

Construction Notice - Rancho San Antonio

Mount Umunhum road closures to begin September 12th

2015-16 Accomplishments Report features major and notable projects and milestones

Automatic External Defibrillators now in all in Emergency Vehicles

Take a virtual reality tour of sea level change.

Upcoming Activities