Osborne Mountain, Bertha May Lake, Granite Lake and Towhead Gap Loop Trail

The Osborne Mountain, Bertha May Lake, Granite Lake and Towhead Gap Loop Trail is a 36.5 km looped trail that starts and ends in Ashford, Lewis County, Washington. Based on our data, the trail is graded as Medium. 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.