An independent special district in the San Francisco Bay Area that has preserved a regional greenbelt system of over 63,000 acres of public land and manages 26 open space preserves.

What's new?

Just announced! Mount Umunhum Grand Opening Weekend - Sept 16 & 17

Enter our Photo Contest today!

Construction Update - Rancho San Antonio

Now Hiring for multiple positions

Keep up to date with the Spring Open Space Views newsletter.

Mountain Lion Activity at Rancho San Antonio

Upcoming Activities

March 25, 2017
March 25, 2017
March 25, 2017