Marin County Parks and Open Space Department

The Marin County Open Space District (MCOSD) manages 250 miles of roads and trails on 34 open space preserves. Roads and trails may be temporarily closed or use restricted, due to safety, wet weather, natural hazards, wildland fire, construction, or restoration. Please cooperate with all closure signs and notices, and take alternate routes. Closures and restrictions are subject to change based on changing conditions. Learn more about trail safety, rules and regulations, and the MCOSD policies. For questions about the MCOSD road and trail closures, contact Superintendent Brian Sanford at (415) 473-7473.

new icon

Closures Due to Storms

The following trails have been closed or restricted due to storm-related conditions.

Closures Due to Road and Trail Projects

2016 Trail Work: Protect Newly Improved Trails with Seasonal Closures

Road and trail improvements have ramped up to implement the Road and Trail Management Plan, adopted in 2014. The vision is to establish and maintain an official, sustainable system of roads and trails that improves the visitor experience while reducing environmental impacts.

With the arrival of October rains, the MCOSD wrapped up its first full season of implementing trail improvements envisioned by the plan. To protect native wildlife while improving the trail for visitors, roads and trails were improved for visitor safety, to enhance drainage, reduce soil erosion, restore habitat, and prevent sediment from entering streams.

When the wet weather arrives, crews apply rice straw, straw waddles, and silt fencing, following best management practices to reduce erosion on newly improved trails. Crews close project sites for the rainy season to allow the soils to settle and compact naturally. Staff monitor projects throughout the winter, especially after storms, to identify any drainage and erosion issues.

Please respect the following seasonal closures to help protect our roads and trails from ruts, potholes, and erosion! The trails will reopen for users when conditions are suitable, as determined by the MCOSD.

  • Roy's Redwood Loop Trail Closed to Horses. Among other visitor safety improvements, five bridges and two small water crossings were installed on the Roy’s Redwoods Loop Trail in Roy’s Redwoods Preserve in the San Geronimo Valley to reduce erosion in the San Geronimo Creek Watershed.
  • Gary Giacomini Boulder Springs Trail and Willis Evans Trail Closed to Bikes and Horses. The Candelero Canyon Trail and the Contour Trail complex, including the Boulder Springs Trail (formerly known as Landbridge) were adopted into the official system and crews made the necessary drainage and safety improvements. Still to come is the decommissioning of some social trails in the Gary Giacomini Preserve, restoring over 8,000 square feet of native Mt. Tam manzanita and redwood forest habitat.
  • Camino Alto Octopus Trail and Val Vista Trail Closed to Bikes and Horses. The Octopus Trail, a multiuse connector in Camino Alto Preserve between Mill Valley and Corte Madera, was officially adopted. The surrounding social trails were decommissioned to protect habitat and enhance recreational opportunities.

Seasonal Fire Road Closures

Baltimore Canyon Preserve

Citron Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Blithedale Summit Preserve

Middle Summit Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Glen Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Camino Alto Preserve

Del Casa Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Cascade Canyon Preserve

Cascade Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Gary Giacomini Preserve

Conifer Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Cortez Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

East Sylvestris Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Manzanita Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

San Geronimo Ridge Fire Road East closes to vehicles, for natural resource protection.
Current status: Closed

San Geronimo Ridge Fire Road West closes to vehicles, for natural resource protection.
Current status: Closed

Summit Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

White Hill Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Horse Hill Preserve

Horse Hill Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Loma Alta

Smith Ridge Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Sunrise Fire Road (formerly Gunshot Fire Road) closes to vehicles, for natural resource protection.
Current status: Closed

Loma Verde Preserve

Chicken Shack Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Little Cat Road Fire closes to vehicles, for natural resource protection.
Current status: Closed

Pebble Beach Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Ponti Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Via Escondia Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Winged Foot Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Lucas Valley Preserve

Luiz Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Ring Mountain Preserve

Endeavor Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Reed Ranch Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Terra Linda/Sleepy Hollow Preserve

Cemetery Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Del Ganado Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Mt. Muir Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Ridgewood Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Terra Linda Ridge Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

White Hill Preserve

White Hill Fire Road closes to vehicles, for natural resource protection.
Current status: Closed

Seasonal Trail Closures

Gary Giacomini Preserve

The Willis Evans Trail closes to bicyclists and equestrians, for Coho salmon habitat protection.
Current status: Closed

Indian Tree Preserve

The Upper Meadow Trail closes to equestrians, for soil conservation.
Current status: Closed

The Rent Barn Trail closes to equestrians, for soil conservation.
Current status: Closed

The Deer Camp Cutoff Trail closes to equestrians, for soil conservation.
Current status: Closed

Roy’s Redwoods Preserve

The Roy’s Redwoods Loop Trail closes to equestrians, for soil conservation.
Current status: Closed

The Sprint Rock Trail closes to equestrians, for soil conservation.
Current status: Closed

Updated On:

3.08.17

We update this page when closures, openings, or conditions change.