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Open Space and Mountain Parks

Open Space and Mountain Parks

Boulder's Open Space & Mountain Parks (OSMP) are a very special place. The open space lands teem with native plants and wildlife and are home to threatened and endangered species. They serve as a buffer between Boulder and nearby development. They sustain agriculture uses and add untold benefits to the natural environment - clean air, water, and earth.

The lands shape the urban mosaic of the Boulder Valley and provide citizens with passive recreation opportunities. Trails are used by walkers, hikers, bicyclists, horseback riders, dog walkers and other passive recreational uses.

OSMP Alerts

Current Trail/Trailhead Closures

Please see the temporary closures page for details on the following closures. OSMP's interactive trail map also shows current trail closures.

  • Red Rocks area trails open, off-trail travel prohibited: Trails in the Red Rocks area are now open, but off-trail travel is prohibited while vegetation recovers from the Sunshine Fire. 
  • South Boulder Creek West trail closed: This trail is closed during the week for repair, but open on the weekends.
  • Lion's Lair parking area closed: The parking area is temporarily closed for clean up after an accident.
  • NCAR Bear Canyon, Mesa trail repairs and closures: NCAR Bear Canyon Trail and portions of the Mesa Trail are closed. Find closure details at
  • East Boulder/White Rocks Trail bridge closed
  • Boulder Falls Trail closed
  • Anemone Hill closed: A portion of the trail is temporarily open for out and back use only.

Other Alerts 

Boulder County fire ban enacted March 15: View more information on the fire ban

Wildlife closures begin March 15: View maps and details on Burrowing Owl Closures and Osprey, Northern Harrier & American Bittern Closures. These closures do not affect designated trails. 

Cottontail Trail advisory: Work on a new pedestrian bridge on the IBM Connector Trail may cause minor delays for Cottontail Trail users, more information

Chautauqua Park improvements: Efforts to improve safety and accessibility at Chautauqua Park will begin on Monday, Dec. 26. Learn more

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Featured Projects & Pages

Two Junior Rangers working on a trail

Junior Ranger Program

Summer jobs for teens! The Junior Ranger Program engages teens on OSMP to serve, discover and grow! Currently recruiting for all positions.

Osprey with a fish it caught

Osprey Cam Live!

View OSMP’s Osprey camera. Get a glimpse into the lives of a pair of Osprey nesting on OSMP. Watch them begin nesting, feeding and raising their young.

Photo of a prairie dog

Prairie Dog Working Group

The City of Boulder has formed a working group that will review prairie dog management practices, and make recommendations to the city manager.

Couple walking with dog on trail

The Boulder Trails Challenge

OSMP has designed a program to help visitors challenge themselves to hike all OSMP trails. Find tools to create your own personalized trail challenge!

Dog on a trail wearing Voice and Sight Tag

Voice and Sight Tags

Information on how to register for the Voice and Sight Tag Program or renew your dogs' Voice and Sight Tags for 2017.


NIST Protected Area Trails

OSMP is working with NIST to designate a trail system for visitor access and use in the NIST Protected Area.

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