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Open Space and Mountain Parks

Open Space and Mountain Parks

Boulder's Open Space and 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 residents with passive recreation opportunities. Trails are used by walkers, hikers, bicyclists, horseback riders, dog walkers and other passive recreational uses.

OSMP Alerts

Covid-19 Alerts| Practice Responsible Recreation

For more information on the alerts below, please visit the Covid-19 Recovery page:  

  • Plan ahead and consider recreating closer to home as parking is extremely limited - especially on Flagstaff Mountain. 
  • Follow all open space regulations and public health orders.  
  • Maintain 6 feet of physical distance from anyone not in your household. Limit gatherings.  
  • Protect vulnerable community members. Always bring a face covering when leaving your home. If you’re older than 12, wear it if you can’t maintain 6 feet of distance from others. 
  • Remember: Leave No Trace! Pick up trash and dog waste. Stay on trail and walk through mud.  Step off if you need to maintain distance but quickly step back on trail. 
  • Protect first responders. Know your limits and don’t take unnecessary risks. 

Stay-up-to-date: Visit OSMP's interactive trails map to see historic data that shows areas of high and low use, OSMP trails that are wider than 6 feet and trail areas with suggested one-way/directional travel.

  • Text "OSMP" to 888-777 to receive important open space updates.
  • Follow us on Twitter , Facebook and Instagram .
  • Visit  OSMPTrails.org  to see historic data that shows areas of high and low open space use and trails that are wider than 6 feet. See when trails are busiest through our  Visitation Data Explorer

Trail/Trailhead Closures

Please see the temporary closures page for more details on the trail closures below. OSMP's interactive trail map also shows these longer-term trail closures and restrictions: 

  • Marshall Mesa Trailhead temporary closure June 3, 2020: The trailhead will be closed one day for maintenance. 
  • Gregory Canyon restroom closed:  The restroom is temporarily closed because of maintenance issues.
  • Muddy trail closures: Please check the trail map or temporary closures page for any muddy trail closures.
  • Boulder Falls closure: Boulder Falls will be closed beginning 10/21 because of road construction in the area. 

Project Updates & Other Alerts

COVID-19 closures and cancellations:  Many OSMP community programs, such as nature hikes and education programs, have been suspended. City parks and OSMP trails will remain open. The city also has closed all city buildings and facilities to the public. Learn more about other city services through the city’s COVID19 (novel coronavirus) webpage. These OSMP closures and cancellations are in  effect:

  • OSMP Hub at 2520 55th Street is closed. Most in-person services can be completed online. See below.
  • Picnic tables and shelters across the Open Space and Mountain Parks system are closed. The Sunrise Amphitheater is also closed.
  • OSMP's Ranger Cottage is currently closed as well as the Flagstaff Nature Center.
  • ​All OSMP public programs, including Voice and Sight Tag Program education classes, nature hikes and education programs are currently canceled. Sign up for program communications at naturehikes.org.
  • Wonderland Lake community engagement planned for late March and April (Engagement Window #3) has been postponed.
  • One-day group volunteer events and projects will begin in mid/late June, visit volunteerosmp.org for registration.
  • OSMP is not currently issuing new special-use permits for large groups on city-managed open space. It also advises that bookings of OSMP facilities for weddings and other events may be subject to change. Facilities are currently closed through June 30.

OSMP permits can be obtained online:

Prairie Dog public process: The City of Boulder has begun an expedited review of how it manages irrigated agricultural fields and prairie dogs later and is seeking input on ways it can foster healthy soils and promote sustainable agricultural land uses. Learn more

Tall Oatgrass Management Program: Grazing and its associated livestock fencing are an important part of a continuing OSMP restoration project to help contain tall oatgrass – a highly invasive, non-native grass – in the area. 

Purchase OSMP annual parking permits online: Visitors whose vehicles are registered outside of Boulder County can now purchase OSMP annual parking permits online. Learn more about parking permits

Open Space and Mountain Parks Calendar

Free, public Nature Hikes and Programs can be found at NatureHikes.org.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

Open Space Board of Trustees Meeting

@ 6 to 8 p.m.

The OSBT usually meets on the second Wednesday of every month. Please view the agenda for meeting information, including start time and location.

View main city calendar for all upcoming city events, or for more events like this

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Featured Projects & Pages

Osprey with a fish it caught

Live Boulder Osprey Cam

View Boulder's live osprey camera. Get a glimpse into the lives of a pair of osprey nesting. Watch them begin nesting, feeding and raising their young.

Dog on a trail wearing Voice and Sight Tag

Voice and Sight Tags

Information on how to register for the Voice and Sight Tag Program or renew your dogs' Voice and Sight Tags.

Boulder Area Trails App Logo

Boulder Area Trails App

The City of Boulder and 11 other agencies created a mobile trails application that provides access to all trail information in and around Boulder County.

Volunteers in the field

Science at OSMP

Learn about the science being conducted by OSMP and independent researchers.

Sample from data explorer

Visitation Data Explorer

OSMP's Visitation Data Explorer provides a dynamic interface for exploring current data from our fleet of long-term trail counters.

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Interactive Trail Map

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