The Dirty Bismark

Boulder, Colorado

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An all-dirt twist on a classic road ride, this relatively new course is symbolic of the rise of off-road cycling in a roadies’ paradise. Suitable for beginners, populated by the pros of Boulder.

The Dirty Bismark Professional Review and Guide

"An all-dirt twist on a classic road ride, this relatively new course is symbolic of the rise of off-road cycling in a roadies’ paradise. Suitable for beginners, populated by the pros of Boulder."

Activity Type: Hiking, Mountain Biking, Trail Running
Nearby City: Boulder
Distance: 14
Trail Type: Out-and-back
Technical Difficulty: Easy to Difficult
Physical Difficulty: Easy to Difficult
Terrain: Rolling hills. Rocky singletrack, smooth widetrack, and some dirt road sections. Significant technical challenges are few and far between.
Duration: 1–2 hours
Season: Year-round
Local Maps: USGS Quad Louisville

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Jun 2018