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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

- Flagstaff Drive closed on 4th of July; fireworks banned on open space: Learn more about these restrictions

- Sanitas Valley Trail reopened July 2: Significant repairs were completed along Sanitas Valley Trail and it is now open to visitors. 

- Temporary leash restriction on Eagle Trail: A leash restriction is in place on Eagle Trail because of coyote activity in the area. Dogs must be leashed from the gate just north of the pond to the gate one-half mile south of the pond. 

- Temporary leash restriction near Shanahan Ridge: OSMP has instituted a leash restriction for a social trail accessible from Stony Hill Road. Learn more about this restriction.

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

  • East Boulder/White Rocks Trail closed from Valmont Road to Phillips Road
  • Boulder Falls Trail 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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