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 closure signs and notices, and take alternate routes.

Safety Closures

White Hill Preserve

White Hill Trail and Sherwood Forest Fire Road in White Hill Preserve are closed to all traffic due to a landslide. Please observe trail closure signs. View closure map.

  • Sherwood Forest Fire Road
  • White Hill Trail

Night Closures to Protect Sensitive Wildlife

Baltimore Canyon Preserve

Piedmont Trail in Baltimore Canyon is closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Piedmont Trail

Blithedale Summit Preserve

The following trail in Blithedale Summit is closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Warner Canyon Trail

Camino Alto Preserve

The following trails in Camino Alto are closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Fairway Trail
  • Octopus Trail

Cascade Canyon Preserve

The following fire road in Cascade Canyon is closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Blue Ridge Fire Road

Gary Giacomini Preserve

The following trails in Gary Giacomini are closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Boulder Springs Trail
  • Haute Lagunitas Trail
  • Hunt Camp Trail
  • Willis Evans Trail

White Hill Preserve

The following trail in White Hill are closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Porcupine Trail

Seasonal Closures

Roads and trails may be closed during the rainy season, typically November through March, for visitor safety and natural resources protection.

Roy's Redwoods Preserve

Roy's Redwoods Loop Trail closed to equestrian use due to wet conditions.
Spirit Rock Trail closed to equestrian use due to wet conditions.

Baltimore Canyon Preserve

Citron Fire Road closed to vehicles, for natural resource protection.

Blithedale Summit Preserve

Middle Summit Fire Road closed to vehicles for natural resource protection.

Camino Alto Preserve

Del Casa Fire Road closed to vehicles, for natural resource protection.

Cascade Canyon Preserve

Cascade Fire Road closed to vehicles, for natural resource protection.

Gary Giacomini Preserve

Conifer Fire Road closed to vehicles, for natural resource protection.
Cortez Fire Road closed to vehicles, for natural resource protection.
East Sylvestris Fire Road closed to vehicles, for natural resource protection.
Manzanita Fire Road closed to vehicles, for natural resource protection.
San Geronimo Ridge Fire Road closed to vehicles, for natural resource protection.
Summit Fire Road closed to vehicles, for natural resource protection.
Willis Evans Trail closed to bicyclists and equestrians, for Coho salmon habitat protection.
White Hill Fire Road closed to vehicles, for natural resource protection.

Horse Hill Preserve

Horse Hill Fire Road closed to vehicles, for natural resource protection.

Indian Tree Preserve

Deer Camp Cut-Off Trail closed to equestrians, for soil conservation.
Rent Barn Trail closed to equestrians, for soil conservation
Rent Barn Trail closed to equestrians, for soil conservation

Loma Alta

Old White Hill Grade Trail newly worked section closed to equestrians only. 
Smith Ridge Fire Road closed to vehicles, for natural resource protection.
Sunrise Fire Road (Gunshot Fire Road) closed to vehicles, for natural resource protection.

Loma Verde Preserve

Chicken Shack Fire Road closed to vehicles, for natural resource protection.
Little Cat Fire Road closed to vehicles, for natural resource protection.
Pebble Beach Fire Road closed to vehicles, for natural resource protection.
Ponti Fire Road closed to vehicles, for natural resource protection.
Via Escondia Fire Road closed to vehicles, for natural resource protection.
Winged Foot Fire Road closed to vehicles, for natural resource protection.

Lucas Valley Preserve

Luiz Fire Road closed to vehicles, for natural resource protection.

Ring Mountain

All Roads closed to vehicles, for natural resource protection.

Terra Linda/Sleepy Hollow Preserve

Cemetery Fire Road closed to vehicles, for natural resource protection.
Del Ganado Fire Road closed to vehicles, for natural resource protection.
Ridgewood Fire Road closed to vehicles, for natural resource protection.
Terra Linda Ridge Fire Road closed to vehicles, for natural resource protection.

White Hill Preserve

White Hill Fire Road closed to vehicles, for natural resource protection.

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

Updated On:

3.7.19

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