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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.

  • NCAR Bear Canyon, Mesa trail repairs and closures: NCAR Bear Canyon Trail and portions of the Mesa Trail are closed. Find closure details at bearcanyon.org
  • 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

Upcoming Closures

South Mesa Trailhead temporarily closed Dec. 9: The trailhead will be closed temporarily for maintenance work; more information

Other Alerts

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

Chapman Dr. & Tenderfoot Trails reopened 10/28: Light construction work is still occurring; please use caution. 

Chautauqua construction to begin Nov. 1: A six-month project to improve pedestrian safety and visitor mobility and accessibility to Chautauqua is expected to begin on Nov. 1. 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 2016.

Prairie dog

Armory Prairie Dog Relocation

Learn more about how the City of Boulder is working to prepare a new home for the Armory prairie dog colony on city open space.

OSMP Logo

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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