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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.

  • Muddy trail closures as of Jan. 21: Trails in the Marshall Mesa, Greenbelt Plateau, Flatirons Vista, Doudy Draw and Springbrook areas, and the Left Hand Trail from Boulder Valley Ranch to Neva Rd are closed because of muddy conditions. 
  • 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 

Prairie dog management working group: The City of Boulder is seeking applicants for an advisory working group to review the city’s current prairie dog management practices. Through collaborative efforts, the advisory group will make recommendations to the city manager regarding management of prairie dogs and their habitats on city-managed public land. Learn more.

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 Access Management Plan (CAMP) open house: Learn more about the Chautauqua Access Management Plan at an open house on Thursday, Jan. 26 from 6:30 to 8:30 pm at the Chautauqua Community House. 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

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.

Photo of a prairie dog

Prairie Dog Working Group

The City of Boulder is seeking applicants for a working group that will review prairie dog management practices, and make recommendations to the city manager.


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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