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
Muddy Trail Closures: Several trailheads and trails are closed because of muddy conditions. This includes all trails and trailheads in the Eldorado Mountain/Doudy Draw and Marshall Mesa areas and some trails and trailheads in the Boulder Valley Ranch Area. Please visit the Temporary Closures page below for the complete list and maps of the closures.
Temporary Closures, Advisories and Fire Bans
Temporary trail closures, advisories and fire bans will be posted on this page; please check before your visit.
Featured Projects & Pages
Junior Ranger Program
Summer of service - Join the Junior Rangers! Information and applications for 2014 positions are available. Deadline April 3, 2014.
Voice and Sight Tag Program Evaluation
Information about the Voice and Sight Tag Program evaluation, process, and opportunities for community input.
After the Flood: Continuing Trail Repairs
The majority of Open Space & Mountain Parks trails are open. Please respect closures for the remaining long-term trail repair projects.
Field Notes - January 2014
As stewards of iconic Boulder landscapes, OSMP is privileged to have so many stories to tell. Here are a few from our premier newsletter.
After the Flood: An in-Depth Discussion About Moving Forward
In the wake of the flood OSMP has worked hard to rebuild area trails. OSMP Director Mike Patton outlines the rebuilding that remains.
OSMP Q&A: How Is Wildlife Faring in the Wake of the Flood?
How is wildlife faring after the flood? An OSMP wildlife ecologist answers that question and talks about the flood's impact on wildlife.
OSMP Cameras Track Local Wildlife
Motion-detecting cameras help OSMP staff learn about local wildlife and protect sensitive habitats. Watch a highlight reel.