This is one of the best towers in the Park. Other than by Jackson Hole Mountain Guides parties, it is rarely climbed. The original route, led without pro by an inspired Bob Merriam in 1950, will surprise many. It ascends "the Rad Sentinel" via a wide crack on the southeast face and a short traverse right to the base of the upper north face. The second pitch follows shallow cracks on the left edge of the north face to the 'a cheval' summit. Rap approximately 120' down the northwest corner.

Follow the Garnet Canyon trail into the canyon and continue towards the Lower Saddle. Hike up past the Caves, then into the couloir directly below the west face of Disappointment Peak. The Red Sentinel sits in the col at the top of the couloir below the west face of Disappointment and east of Fairshare Tower.