Trail and Area Closures and Advisories
Open Space and Mountain Parks (OSMP) makes every attempt to keep this page as up to date as possible. However, some closures and trail advisories are made on an emergency basis for the safety and well-being of our visitors, wildlife and natural resources. Please watch for these signs during your visit. Descriptions of closures and links to more information, including maps, are below.
Covid-19 Alerts| Practice Responsible Recreation
Always bring a face covering when you leave home and maintain 6 feet of distance
- You will need a face covering to visit Boulder’s open space trails and parks. Always bring one with you when you leave home.
- Place it over your nose and mouth when you can’t maintain 6 feet of distance from others.
- Wear it around your neck or wrist when no one else is around.
- Parents should help children older than 2 years old properly wear a face covering.
- Help protect vulnerable community members and each other.
Don’t forget: Keep the space in open space! Always stay at least 6 feet from others you don’t live with or haven’t agreed to have close contact with.
Please follow these other responsible recreation reminders:
- Visit OSMPTrails.org to see current trail closures, historical 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 .
- Protect first responders. Know your limits and don’t take unnecessary risks.
- Plan ahead and consider recreating closer to home as parking is extremely limited - especially on Flagstaff Mountain.
- 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.
- For more responsible recreation reminders, please visit the Covid-19 Recovery page.
OSMP's interactive trail map now includes trail closures - an easy option to check before your trip!
Current Trail Closures
The closures listed below are currently in place. Please review all closures and advisories before you visit OSMP.
Trail Closures, Advisories and Fire Bans
Temporary trail closures, advisories and fire bans will be posted on this page; please check before your visit.
Current Area Closures
The area closures below do not close any designated hiking trails (climbing access trails may be affected). Please be sure to check for any leash restrictions if you are bringing a dog.
OSMP closes two areas from Nov. 1 - July 31 every year to protect nesting bald eagles.
OSMP closes certain areas Feb. 1 to July 31 every year to protect cliff-nesting raptors.
OSMP closes certain areas from March 15 to Oct. 31 every year to protect nesting burrowing owls.
OSMP and Parks & Rec close certain areas from March 15-Sept 10 every year to protect nesting osprey, Northern Harriers and American bittern.
Grassland Ground Nesting Bird Closures
OSMP closes certain areas from May 1 to July 31 every year to protect grassland ground nesting birds.
Bat Roosting Site Closures
Some areas are permanently closed to prevent the spread of White-Nose Syndrome; other areas have seasonal closures to protect roosting bats.
New Zealand Mudsnail Closures
Dry Creek and Boulder Creek downstream of Valmont Road are closed year round because of the non-native, invasive New Zealand Mudsnail.
The closures listed below are not currently in place. You may review the maps for reference, but these areas are not currently closed.
Seasonal Leash Restrictions
Seasonal leash restrictions are in place from Aug. 15 to Nov. 1 every year in certain areas that are frequent foraging locations for bears.