4.0 star · Difficult Loop

Headache and Miller Rock

Arapaho and Roosevelt National Forests · Boulder County, Colorado

Trail length

12.0 km

Time

~3 hrs 18 min

Elevation Gain

545 m

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"An epic challenge to remember from the heart of Boulder County"

The Headache and Miller Rock is a 12.0 km looped trail that starts and ends in Lyons, Boulder County, Colorado. Based on our data, the trail is graded as 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 4 hrs 31 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.