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Trail and Area Closures and Advisories

Open Space and Mountain Parks (OSMP) makes every attempt to keep this page as up to date as possible. However, some closures and trail advisories are made on an emergency basis for the safety and well-being of our visitors, wildlife and natural resources. Please watch for these signs during your visit. Descriptions of closures and links to more information, including maps, are below.

OSMP Alerts

Winter conditions 

Winter conditions exist across open space! 

  • Trails may be icy & slick. 
  • Wear appropriate gear, such as traction devices for your shoes/boots.
  • Do not walk on ice-covered lakes and ponds.


People enjoy open space for physical, emotional and mental health. Remember to always be courteous. Don't forget: 

  • Only recreate with household members.
  • Wear a face covering when passing others. 
  • Stay on trail/walk through mud. Avoid stepping on vegetation. 
  • Visit  to see current trail closures, historical data that shows areas of high and low open space use and trails that are wider than 6 feet. See when trails are busiest through our  Visitation Data Explorer .
  • Protect first responders. Know your limits and don’t take unnecessary risks.

Boulder Star closure

The Boulder Star area on Flagstaff Mountain IS CLOSED to prevent gatherings amid the COVID-19 pandemic and because of ecological and safety concerns in the area. Visitors entering the Boulder Star closure area on Flagstaff Mountain can face up to a $1,000 fine or 90 days in jail. Learn more

Trail Map:

OSMP's interactive trail map now includes trail closures - an easy option to check before your trip!

Current Trail Closures

The closures listed below are currently in place. Please review all closures and advisories before you visit OSMP.

Trail Closures, Advisories and Fire Bans

Photo of closed trail Temporary Closures, Advisories and Fire Bans

Temporary trail closures, advisories and fire bans will be posted on this page; please check before your visit.

Current Area Closures

The area closures below do not close any designated hiking trails (climbing access trails may be affected). Please be sure to check for any leash restrictions if you are bringing a dog.

Seasonal Raptor Closures

Photo of Bald Eagle by Klaus Girk Bald Eagle Closures Nov. 1 - July 31

OSMP closes two areas from Nov. 1 - July 31 every year to protect nesting bald eagles.


Photo of Peregrine Falcon Cliff-Nesting Raptor Closures Feb. 1 - July 31

OSMP closes certain areas Feb. 1 to July 31 every year to protect cliff-nesting raptors. 


Bat Roosting Site Closures

Photo of bats sleeping Bat Roosting Site Closures - Year Round & Seasonal

Some areas are permanently closed to prevent the spread of White-Nose Syndrome; other areas have seasonal closures to protect roosting bats.

New Zealand Mudsnail Closures

Photo of New Zealand Mudsnails by Dan L. Gustafson New Zealand Mudsnail Closures - Year Round

South Boulder Creek between South Boulder Road and Marshall Road is temporarily closed and Dry Creek and Boulder Creek downstream of Valmont Road are closed year round because of the non-native, invasive New Zealand Mudsnail.

Inactive Closures

The closures listed below are not currently in place. You may review the maps for reference, but these areas are not currently closed.

Seasonal Leash Restrictions

Photo of a black bear Seasonal Leash Restrictions Aug. 15 - Nov. 1

Seasonal leash restrictions are in place from Aug. 15 to Nov. 1 every year in certain areas that are frequent foraging locations for bears.

Seasonal Raptor Closures

Photo of Burrowing Owls by Perry Conway Burrowing Owl Closures March 15 - Oct. 31

OSMP closes certain areas from March 15 to Oct. 31 every year to protect nesting burrowing owls.

Photo of Osprey by Wendy Marie Stewart Osprey, Northern Harrier & American Bittern Closures March 15 - Sept. 10

OSMP and Parks & Rec close certain areas from March 15-Sept 10 every year to protect nesting osprey, Northern Harriers and American bittern.

Grassland Ground Nesting Bird Closures

Photo of Vesper Sparrow by Thomas Wilberding Grassland Ground Nesting Bird Closures May 1 - July 31

OSMP closes certain areas from May 1 to July 31 every year to protect grassland ground nesting birds.