There's no better season for a hike. In fall, leaves color forest trails, filling the air with an earthy aroma. Summer crowds are gone, and you can climb to spectacular heights without breaking a sweat.

Grab a jacket and hit one of these 10 trails throughout the U.S. and Canada to watch the season play out. See salmon spawn by the thousands, watch migrating hawks do fly-bys, and listen for elk bugling in the distance.