Osgood Trail is a 9.6 mile out and back trail located near Gorham, NH and is rated as moderate. The trail is primarily used for hiking and backpacking and is accessible year-round.
Directions from Dolly Copp Campground,: Travel past the campground entrance (Dolly Copp Road) to the very end. Begin on Gulf Link Trail and hike about 1 mile to Great Gulf Trail and hike about 2 more miles to reach Osgood Trail.
Overview, map and 1 other review here don't seem to be accurate. Osgood Trail runs along ridge from Osgood camp site (well below the tree line) area on SE side of Mount Madison up a few thousand feet in elevation to the summit of Mount Madison and down to Madison Spring Hut. You do break out of the tree line well before the true summit (there are several lower summits to tease you). The trail is reasonably well maintained but very vertical (no switchbacks) and very rocky above the tree line. Views above the tree line are wonderful and make the climb worth it - if the weather is cooperating. I posted a link with better detail info on the trail.
Beautiful trail goes the distance and never seemed to dip below tree line, execellent views to be had walking this trail. Star Lake, Madison, and Adams cant beat it.