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21.9 km
~5 hrs 19 min
567 m
Out and Back
The Green Reservoir via Buchanan Pass Trail is a 21.9 km trail that starts in Allenspark, Boulder County, Colorado. Based on our data, the hike is graded as Easy. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates. This hike can be completed in approx 5 hrs 19 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.
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