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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

- Muddy trail closures as of May 23: Trails in the Marshall Mesa, Greenbelt Plateau, Flatirons Vista, Doudy Draw and Springbrook areas, and the Lefthand Trail from Boulder Valley Ranch to Neva Rd are closed because of muddy conditions. View more information about the muddy trail closures.

- South Mesa Trailhead closed May 28: South Mesa Trailhead will be closed on May 28, learn more on the temporary closures page.

- Rock Island 1 in Boulder Canyon closed effective May 15: The rock has been evaluated as unstable and will be closed until the loose rock is scaled.

- Several trails are closed for longer-term projects: Please see the temporary closures page for details on the following closures:

  • Sanitas Valley Trail closed
  • Boulder Falls Trail closed
  • Gregory Canyon Access Road closed
  • Anemone Hill closed - a portion of the trail is temporarily open for out and back use only

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Featured Projects & Pages

North TSA Recreation Logo

North Trail Study Area Plan

OSMP has begun work on the North Trail Study Area (TSA) Plan. Learn more about the plan and how you can participate in the process.

Dog on a trail with a Voice and Sight Tag

2015 Voice and Sight Tags

To let your dogs walk off-leash on Boulder open space trails in 2015, you must first take a Voice and Sight education class.

Firewood Program

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

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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