Boulder - Grand Pass and Thunder Lake Trail
23.3 km
~1 day 1 hrs
1145 m
"An epic challenge to remember from the heart of Boulder County"
The Boulder - Grand Pass and Thunder Lake Trail is a 23.3 km looped trail that starts and ends in Allenspark, Boulder County, Colorado. Based on our data, the trail is graded as Extra Difficult. 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 trail can be completed in approx 3 days. 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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