Midpeninsula Regional Open Space District

Midpeninsula Regional Open Space District, commonly known as Midpen, is an independent special district in the San Francisco Bay Area dedicated to acquiring, preserving, restoring, and managing open space. It was created in 1972 through voter initiative Measure R in response to concerns about the loss of foothills, forests, grasslands, baylands, and other undeveloped landscapes surrounding the rapidly urbanizing peninsula. Rather than operating as a conventional commercial brand, Midpen functions as a public land-management and conservation institution whose public identity is expressed through its preserves, trails, ranger services, educational programs, and long-term land-protection work. The district serves portions of Santa Clara, San Mateo, and Santa Cruz counties. Its tax and voter base covers approximately 550 square miles and about 763,000 people, primarily in Santa Clara and San Mateo counties. Midpen's central conservation objective is to create and maintain a connected regional greenbelt by linking its own holdings with other public parks and protected lands. It participates in cooperative regional trail and conservation initiatives, including the San Francisco Bay Trail, Bay Area Ridge Trail, and Skyline-to-the-Sea Trail. By 2025, Midpen had permanently protected more than 70,000 acres across 26 open space preserves. These lands encompass a broad range of California habitats, including coastal grasslands, redwood forests, oak savannah, foothills, baylands, and agricultural or rural landscapes. Twenty-four preserves are open to the public without an entrance charge, generally from dawn until one-half hour after sunset. Miramontes Ridge and Tunitas Creek preserves were identified as not open to the public in the reference material. Recreation is intentionally designed to remain compatible with ecological protection. Hiking is widespread, while cycling, horseback riding, and leashed-dog access are permitted on designated trails. Windy Hill allows paragliding and hang gliding under a special-use permit, and Monte Bello provides a permitted backpacking camp. Camping is otherwise generally prohibited. As of 2025, the district managed approximately 259 miles of hiking trails, including 163 miles open to bicycles, 223 miles open to equestrians, and 63 miles open to leashed dogs. Some additional trail mileage requires a permit. Midpen preserves are generally lightly developed. Facilities commonly consist of parking areas, trail signs, and, where available, basic sanitation facilities. Rangers patrol the preserves and provide public-safety, visitor-assistance, and stewardship services. Ranger staff are sworn peace officers and do not carry firearms; dispatch services are provided under contract by the Mountain View Police Department. The district's stated mission is to acquire and preserve a regional greenbelt of open space in perpetuity, protect and restore the natural environment, and provide opportunities for ecologically sensitive public enjoyment and education. On the coast, its expanded mission also emphasizes preserving agricultural land and rural character and encouraging viable agricultural use. Midpen's funding is principally tied to property-tax revenues, supplemented at times by state and federal grants, private donations, and rental income. The district projected fiscal-year 2025–2026 revenues of $94.4 million, including $82 million from a portion of property taxes.

Midpeninsula Regional Open Space District was established in 1972 after voters approved Measure R. Its creation reflected the growing need for a regional institution capable of protecting undeveloped land in the San Francisco Bay Area, where suburban and urban expansion threatened foothills, forests, grasslands, coastal areas, and other open landscapes. As an independent special district, Midpen was structured to acquire and manage land across jurisdictional boundaries rather than limiting conservation to a single city or county park system. The district's long-term approach has centered on assembling a connected network of permanently protected properties. This greenbelt strategy seeks to prevent habitat fragmentation, maintain scenic and rural character, protect watersheds and wildlife habitat, and preserve opportunities for public enjoyment. Midpen's holdings have expanded to more than 70,000 acres distributed among 26 preserves, with landscapes ranging from Bay Area foothills and oak savannah to redwood forests, coastal grasslands, baylands, and agricultural areas. Public access has developed alongside conservation management. Most preserves are open free of charge throughout the year during daylight hours, although access rules vary by preserve and activity. Hiking is the most broadly available use, while bicycles, equestrians, leashed dogs, and specialized activities such as permitted paragliding are allowed only where compatible with site conditions and management policies. The district generally avoids intensive park development, favoring trails, parking areas, signs, and limited basic facilities that maintain the relatively undeveloped character of the preserves. Midpen's work also extends beyond its own property boundaries. The district participates in regional efforts associated with the San Francisco Bay Trail, Bay Area Ridge Trail, and Skyline-to-the-Sea Trail, helping connect its preserves with other public and protected lands. These partnerships support a broader regional system of open space and trails rather than treating each preserve as an isolated destination. The district's conservation mission includes both natural-resource protection and public education. Rangers patrol preserves, assist visitors, and support public safety, while land-management activities include habitat protection and ecological restoration. On coastal lands, Midpen's mission additionally recognizes the importance of agricultural land, rural character, and continued viable agricultural use. This reflects the district's role not only as a park operator but also as a regional land steward. Midpen is funded primarily through property-tax revenue associated with its voter and tax base, with additional support sometimes coming from government grants, private donations, and rental income. The district's projected fiscal-year 2025–2026 revenue was $94.4 million, of which $82 million was projected to come from a portion of property taxes. By 2025, its system included approximately 259 miles of hiking trails, with designated portions available to bicycles, equestrians, and leashed dogs. Two of the 26 preserves, Miramontes Ridge and Tunitas Creek, were identified as not open to the public in the reference material.

• 2025

  Expansion of the protected open-space network

  [1]Midpeninsula Regional Open Space Districten.wikipedia.org

  The district was described as permanently protecting more than 70,000 acres across 26 open space preserves and managing approximately 259 miles of hiking trails.

• 2025

  Public access and trail-use profile

  [1]Midpeninsula Regional Open Space Districten.wikipedia.org

  Twenty-four of the district's 26 preserves were identified as open to the public free of charge, with designated trail access for hikers, cyclists, equestrians, and leashed dogs.

• 2025

  Projected fiscal-year 2025–2026 funding

  [1]Midpeninsula Regional Open Space Districten.wikipedia.org

  The district projected $94.4 million in revenue for fiscal year 2025–2026, including $82 million from a portion of property-tax receipts.

• 1972

  Creation through Measure R

  [1]Midpeninsula Regional Open Space Districten.wikipedia.org

  Voters approved Measure R, establishing the Midpeninsula Regional Open Space District as an independent special district for regional land preservation.

A publicly accountable regional conservation agency focused on permanent land preservation, connected greenbelts, habitat restoration, and low-impact access to protected landscapes.

• Conservation land

  Open space preserves

  Midpen's principal public offering is its network of 26 permanently protected preserves. Together they represent more than 70,000 acres of foothills, baylands, redwood forests, coastal grasslands, oak savannah, and other open landscapes. The preserves are managed primarily for conservation, with public access provided where compatible with ecological conditions and site-management requirements.

• Recreation infrastructure

  Regional trail network

  The district manages approximately 259 miles of hiking trails, including designated mileage for bicycles, equestrians, and leashed dogs. Trails are generally designed as low-impact infrastructure within relatively undeveloped preserves. Midpen also contributes land and connectivity to regional systems such as the Bay Area Ridge Trail, San Francisco Bay Trail, and Skyline-to-the-Sea Trail.

• Public education and visitor services

  Environmental education and ranger services

  Midpen combines public access with environmental education, visitor guidance, patrols, and stewardship. Rangers provide assistance and public-safety services across the preserves. Dispatch support is provided through a contract with the Mountain View Police Department, while ranger staff are sworn peace officers who do not carry firearms.

1. 1Midpeninsula Regional Open Space Districten.wikipedia.org
2. 2Midpeninsula Regional Open Space District official websiteopenspace.org