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.

Baltimore Canyon Preserve

A portion of Dawn Falls Trail has been temporarily closed until June 15. Piedmont Trail in Baltimore Canyon is also closed to all traffic from one hour after sunset to sunrise between February 1 and and July 31. Please observe trail closure signs.

  • Dawn Falls Trail (temporary partial closure)
  • 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

Project Impacts and Closures

Alto Bowl Preserve

Work on the Bob Middagh Trail has been completed. This trail is closed to bikes and equestrians until soils on the trail settle and compact naturally. For safety, please observe posted trail closure signs. MCOSD is planning to reopen this trail in spring 2018 if conditions allow.

Horse Hill Preserve

Horse Hill Trail work has been completed. The new segment of Horse Hill Trail is closed to equestrians until soils settle and compact naturally. If conditions allow, MCOSD will reopen Horse Hill Trail for equestrian use in spring 2018. Gasline Trail remains open to equestrians until Horse Hill Trail is opened for equestrian use. For safety, please observe posted trail closure signs.

Gary Giacomini Preserve

Hunt Camp Trail is currently closed to bikes for visitor safety and natural resource protection.

Seasonal Closures

None

Updated On:

05.17.18

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