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From the Dry Creek/Rainbow Trail junction, turn west up the Dry Creek trail and follow it for about 2 miles as it takes you along the stream. At 10,600 feet, the trail begins to pull up away from the stream on the north slope to gain altitude. At 10,900 feet, you should come to a trail intersection. The Dry Creek trail continues south, back toward the creek, while the old Horn Creek trail ascends steeply north to gain the east ridge of Horn Peak. Once on the ridge, continue hiking on the trail SW, then west up through the trees to treeline. In the higher tundra, the trail begins to dissipate. Just continue walking over Class 2 terrain of tundra, embedded rocks, and as you approach the summit, more rocks and rubble until you reach the actual summit. Admire the vast view of the Wet Valley below you to the east. It should be noted that this description is for what may be an older trail approach (which may be "closed") to Horn Peak and a newer route, preferred by the Forest Service has been introduced as indicated in this SummitPost report. That route takes you another 3/4 mile past the Dry Creek trail junction and then heads west, eventually crossing Hennequin Creek and gaining a NNE ridge of Horn peak at the elevation marker of 12,665 ft.