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

OSMP Alerts

Trail/Trailhead Closures

Trail closures related to Xcel transmission line work: Starting Tuesday, June 19, OSMP visitors will encounter multi-day closures southwest of Boulder while Xcel Energy removes electric transmission lines. This work is anticipated to last for five days. Anticipated closures include the South Mesa Trailhead and portions of the Mesa Trail. View a map of upcoming trail closures pdf. To help ensure visitor safety in the project site area, these closures will be in effect at all times (24 hours, each day).

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

  • Muddy trail closures as of June 19: Left Hand Trail is being closed. Trails in the Marshall Mesa, Greenbelt Plateau, Flatirons Vista, Doudy Draw and Springbrook areas are closed because of muddy conditions. View more information about the muddy trail closures.
  • 1st/2nd Flatiron Trail work: The trail will be closed Mon. through Thurs. every week, beginning June 4. 
  • Community Ditch and Coal Seam Trails leash-required: Dogs must be on leash east of Highway 93 because of coyote activity. 
  • East Boulder/White Rocks Trail bridge closed

Project Updates & Other Alerts

Boulder County fire restriction: Boulder County has enacted Level 1 Fire Restrictions, effective June 12, for western Boulder County. OSMP grills and fireplaces are closed because of the ban. More information from Boulder County on what's included in the ban

OSMP Master Plan: See a video about recent community engagement and learn how the draft focus areas emerged from your input. Learn more pdf about how additional community input helped refine draft focus areas and related topics, and sign up for email updates.

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 & Mountain Parks Calendar

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Featured Projects & Pages

Junior Rangers moving large rock

Junior Ranger Program

Summer jobs for teens! The Junior Ranger Program engages teens on OSMP to serve, discover and grow! Recruitment is closed for 2018.

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.

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.

Close up of trail map showing parking fee symbol

Open Space Parking Permits and Fees

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

Ranger teaching fishing program

OSMP Ranger Naturalists

Open Space and Mountain Parks Rangers work to protect the trails and rich and diverse public landscapes here in Boulder.

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Interactive Trail Map

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