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Open Space and Mountain Parks

Open Space and Mountain Parks

Boulder's Open Space and 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 residents with passive recreation opportunities. Trails are used by walkers, hikers, bicyclists, horseback riders, dog walkers and other passive recreational uses.

How do you want to enjoy Boulder’s open space in the future?

Tell us how you would like to recreate and steward Boulder’s open space over the next decade and beyond through our online questionnaire by midnight, Tuesday Nov. 20. Your input will establish priorities for the Open Space and Mountain Parks Master Plan’s “Responsible Recreation, Stewardship and Enjoyment” focus area.

OSMP Alerts

Trail/Trailhead Closures

Trail closures related to Xcel transmission line work:  The Bear Canyon Trail west of the Mesa Trail is closed while Xcel Energy continues work to replace electric transmission line infrastructure on city-owned open space and utility lands. This long-term trail closure will be in effect 24 hours a day and is expected to continue through November, weather permitting. There are several other trail closures south and east of the National Center for Atmospheric Research. Details can be found at

Please see the temporary closures page for more details on the trail closures below. OSMP's interactive trail map also shows these longer-term trail closures and restrictions: 

  • Muddy trail closures as of Nov. 14: 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. View more information about the muddy trail closures.
  • NCAR-Bear Canyon Trail: Closed M-F from Stony Hill access to NCAR-Bear Connector beginning Sept. 27
  • East Boulder/White Rocks Trail bridge closed

Project Updates & Other Alerts

OSMP administrative offices have moved:  The offices relocated to 2520 55th St. in Boulder.

Eldorado Canyon to Walker Ranch Connection Feasibility Study: The findings of a feasibility study and a preliminary recommendation for a preferred trail alignment between Walker Ranch Open Space and Eldorado Canyon State Park will be presented from 5:30 to 7:30 p.m., Nov. 28. This meeting will be held at City of Boulder Open Space and Mountain Parks 2520 55th Street, Boulder. Learn more.

Purchase OSMP annual parking permits online:  Visitors whose vehicles are registered outside of Boulder County can now purchase OSMP annual parking permits online. Learn more about parking permits

Open Space and Mountain Parks Calendar

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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 2018.

Couple hiking on a trail

OSMP Regional Trails

OSMP is committed to working with other city departments, Boulder County and other partner agencies to advance regional trail connections.

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Interactive Trail Map

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