Trail Closures, Notices, Alerts & Conditions

Trail Closures, Notices, Alerts, & Conditions

Toxic blue-green algae have been confirmed in multiple lakes and ponds in Colorado. The county is not testing for blue-green algae in open space ponds, so please take appropriate precautions. Learn More →

Closures, Notices, & Alerts

Trail Description
Anne U. White Trail The Anne U. White Trail is closed due to trailhead reconstruction.
Big Sky Loop at Lagerman Agricultural Preserve A section of the Open Sky Loop is closed due to the Southern Water Supply Project II. See the Lagerman Agricultural Preserve page for details.
Boulder Canyon Trail The trail may be closed due to construction along Boulder Canyon/SH 119. Check the Project Page for details.

Email & Text Alerts

Sign up to receive email and/or text alerts whenever trails open or close.


Muddy Trails

Shortcutting around muddy trails greatly increases erosion and destroys vegetation. If a trail is reported to be in poor condition, consider using another trail.

Tips for Muddy Trails

  • Use trails early in the morning before it gets too muddy
  • Go through mud, not around it – trails take years to heal, so get muddy
  • Use a different trail if it is too muddy

Muddy Trails

Trail Condition Tweets for All Trails

Rangers will usually report when trail conditions are less than favorable.

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5201 St. Vrain Rd.
Longmont, CO 80503
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Parks are open sunrise to sunset

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