There is only one trailhead, so in and out is the way to hike it normally. Being 14.2 miles long; it's a long hiking trail. Different parts of Glacier Ridge Trail are at very different elevations, and that means that some parts of the hiking trail could be very different from other parts of it. The total elevation difference for this hiking and backpacking trail is 3,891 feet, and that is higher than average. Now, this is roughly a 2-day backcountry walk, so make sure you've got all your overnight gear packed. Glacier Ridge Trail is quite long, so make sure you bring plenty of supplies.