Longmont-to-Boulder Regional Trail
LoBo Trail

Longmont-to-Boulder (LoBo) Regional Trail

Construction crews are restoring a section of Left Hand Creek. The LoBo Trail is open during construction but there may be short waiting periods. Learn more.

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 TrailHiking Allowed Dogs Allowed Bikes Allowed Horses Allowed
~12 miles – Easy


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


  • Temporary facility at Niwot 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.

Bielins Hock Stream Restoration Project

Boulder County Parks & Open Space is implementing the restoration of 850 linear feet of Left Hand Creek on the Bielins-Hock Open Space Property from damage that occurred during the flood of September 2013.

Construction is expected to be completed by September 30, 2017. The LoBo Trail will not be closed during construction, however there may be short waiting periods to continue on the trail past the project site. Flaggers will be on the trail when large trucks are entering the trail corridor.

This project is supported by grants from United States Department of Agriculture, Natural Resource Conservation Service, Emergency Watershed Protection program and administered through the Colorado Water Conservation Board’s Colorado Watershed Program and State of Colorado funds provided from the State Disaster Emergency Fund with matching funds from Boulder County.

LoBo Creek Restoration Map


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

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Parks are open sunrise to sunset

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