LoBo Trail 

Longmont-to-Boulder (LoBo) Regional Trail

The Monarch Trailhead and a section of the LoBo Trail are closed due to culvert construction on Monarch Road through August. Please follow the trail detour.

The Longmont-to-Boulder (LoBo) Regional Trail is a 12-mile trail system that runs through Gunbarrel, Niwot, and open space properties connecting the City of Boulder with the City of Longmont.


LoBo Trail

~12 miles
Dogs Allowed Bikes Allowed Hiking Allowed Horses Allowed


  • Temporary facility at Niwot Trailhead


  • Cottonwood Trailhead (City of Boulder)
  • Lefthand Creek Park (City of Longmont)
  • Lefthand Valley Grange
  • Monarch Trailhead
  • Niwot Trailhead
  • Twin Lakes Trailhead

Keep in Mind

  • Unauthorized motor vehicles are prohibited including electric bikes, scooters and mopeds.
  • Stay on the designated trail as private property borders the trail in several places.
  • There are several areas where you need to use on-street connections.


See the list of completed trails sections, current and future projects on the LoBo Regional Trail Project Page.


Parks & Open Space

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Parks are open sunrise to sunset
Check Trail Conditions