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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.

  • Halfway House parking area weekday closures: The parking area is closed from 8 am - 4:30 pm, Monday - Friday.
  • Intermittent closures on 1st/2nd Flatirons Trail: The 1st/2nd Flatirons trail will be closed on Wednesdays and Thursdays from 8 am - 4:30 pm.
  • Chapman Drive and Tenderfoot Trails closed: The trails are closed into fall 2016 to repair erosion damage on Chapman Drive from the Sept. 2013 floods. Reopening Friday, Oct. 28
  • 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 Trail/Trailhead Closures

NCAR Bear Canyon, Mesa trail repairs and closures: Starting as early as Monday, Oct. 3, OSMP will begin to rebuild the NCAR-Bear Canyon Trail and a Mesa Trail section south of the National Center for Atmospheric Research (NCAR). Learn more at

Other Alerts

Fire ban effective Oct. 22: A fire ban is in place for unincorporated Boulder County west of Highway 93/Broadway. More information.

Chautauqua Trail repairs: Starting as early as Tuesday, Sept. 27, OSMP will begin work to repair a section of the Chautauqua Trail. More information on the project.

Gregory Canyon Trailhead restroom closed: The Gregory Canyon Trailhead restroom is closed for maintenance. 

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Featured Projects & Pages

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.

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.

Firewood Program

Information and instructions to obtain wood that is available to the public and a calendar showing wood availability.


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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