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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 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

- Voice and Sight Education Classes cancelled Feb. 26: All Voice and Sight Education Classes have been cancelled for Thursday, Feb. 26 because of the weather.

- OSMP to increase enforcement of Voice and Sight Tag Program changes: When the program updates took effect, OSMP rangers focused on educating and warning dog guardians about changes to the program in order to promote compliance. Now enforcement will transition to citations of guardians whose off-leash dogs do not have current Voice and Sight Tags. Previously issued green tags are no longer valid. Visit to start the process to obtain a 2015 blue tag.

- Share your opinions on what the city needs to look for in its new OSMP director: Come to two public meetings later this month to offer your thoughts. Learn more about the meetings.

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

  • Sanitas Valley Trail closed
  • Section of South Boulder Creek Trail on both sides of US 36
  • 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

Dog wearing a green tag

2015 Voice & Sight Tags

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

Working on Royal Arch Trail

Royal Arch Repairs

The Royal Arch Trail reopened on Sat. Nov. 8. Learn more about how OSMP and local climbers came together to rebuild the trail.


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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