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Open Space and Mountain Parks

Open Space and Mountain Parks

Boulder's Open Space & Mountain Parks 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 starting April 17: 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.

- Royal Arch Trail work and closures April 17 - May 8: Royal Arch Trail will be closed Tuesdays & Wednesdays from April 17 - May 8 and work will occur on the trail from Tuesday to Friday each week, learn more about the Royal Arch trail work.

- North Trail Study Area Plan: Visit to learn more or subscribe for email updates about the plan.

- 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
  • Flagstaff Summit Road closed to vehicles for winter season

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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.


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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