The Midpeninsula Regional Open Space District is a California special district, a form of local government created by a community to meet a specific need.  The District was founded in 1972 to preserve the regional greenbelt in northwestern Santa Clara County. The voters expanded the District in 1976 to include southern San Mateo County and again in 1992, to add a small portion of Santa Cruz County. In 2004, through the Coastside Protection Program, the District’s boundary was extended to the Pacific Ocean in San Mateo County. Download district map

Represented Cities

San Mateo CountySanta Clara County
  • Atherton
  • East Palo Alto
  • El Granada
  • Half Moon Bay
  • La Honda
  • Loma Mar
  • Menlo Park
  • Montara
  • Moss Beach
  • Pescadero
  • Portola Valley
  • Redwood City
  • San Carlos
  • San Gregorio
  • Woodside
  • Cupertino
  • Los Altos
  • Los Altos Hills
  • Los Gatos
  • Monte Sereno
  • Mountain View
  • Palo Alto
  • Saratoga 
  • Sunnyvale
Purisima Creek Trail

Board Meetings

The Board holds its regular meetings on the second and fourth Wednesdays of each month. The public is invited and encouraged to attend these meetings, and to participate in the decision-making process.Learn more
St. Joseph's Hill Preserve


A collection of reports including our Strategic Plan, Action Plans and Annual Budgets, and Audited Financial Statements.Learn more
Bear Creek Redwoods

Measure AA

Measure AA is a $300 million general obligation bond approved in June 2014 by over two-thirds of District voters.Learn more
bids and proposals

Bids & Proposals

Requests for Quote/Bids and Requests for Qualifications/Proposals are issued for a variety of services and projects.Learn more
Alpine Pond

Public Notices

CEQA Notices and other public information.Learn more

Brochures and Publications

Midpen produces a number of publications to help you get out and enjoy the preserves.Learn more
Monte Bello OSP


A variety of policies are in place to guide Midpen and users of open space lands.Learn more
Toto Ranch


The Midpeninsula Regional Open Space District was created by voter initiative in 1972.Learn more
Windy Hill OSP

Transparency Portal

The Midpeninsula Regional Open Space District’s transparency portal is part of the District’s ongoing commitment to open government and transparency.Learn more
wallace stegner bench

Commemorative Bench Dedications

Midpen offers a very limited commemorative bench dedication program based on select criteria.Learn more