Mount Wilson Toll Road, Idlehour and Middle Sam Merrill Loop Trail
25.7 km
~1 day 4 hrs
2672 m
"An epic challenge to remember from the heart of Los Angeles County"
The Mount Wilson Toll Road, Idlehour and Middle Sam Merrill Loop Trail is a 25.7 km looped trail that starts and ends in Altadena, Los Angeles County, California. 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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