The second option is a hike and climb to the true summit. You follow a narrow goat trail along the southeast side of the Dragon's Tail, threaded between two sets of cliffs. Watch every step here as along much of the route there's nothing to stop you from tumbling several hundred feet if you lose your balance. After half a mile or so, you stop just short of the first big couloir, then scramble up 450 ft of cliff. Once at the top of the ridge its another 1/4 mile hike to the true summit, 8580 ft, marked by a large cairn with a register on the west side of the cairn. Views to the north, south, and east are amazing, but views of the Sperry Glacier are better if you hike another 1/4 mile south to the end of the ridge top. This second option is not for the casual hiker and should only be attempted by someone with rock climbing experience. A helmet would be a good idea also. This is a trail with two very different hikes at the end!
Below left: View to the east from the true summit, Going-To-The-Sun Mountain on the left and the St. Mary valley.
Below Right: View to the south from the Cairn, with Sperry Glacier in the distance