This small chunk of stone is a secluded and rarely traveled wall that houses Jamminy Crackit, one of the finest crack lines in the canyon. The stone looks like it is straight out of Vedauwoo, though once on it, you'll see it holds the gneiss that the Poudre is known for.
The Sentinel is due north and a little east of the summit of Greyrock. It is best found by descending from the first little pond along the summit trail (almost to the top of Greyrock). There is a highpoint clearly seen from the big pond on the summit looking north. Bushwhack to the West of that high point (you'll be descending to get there. It is a bit convoluted though there is a somewhat cairned trail. The most favorable approach is to climb one of the routes on Greyrock proper to the summit, then hike from there.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for The Sentinel:
Jamminy Crackit 5.11d Trad, 1 pitch, 65 feet
Featured Route For The Sentinel
Jamminy Crackit 5.11d CO : Fort Collins : ... : The Sentinel
This is a Luebben/Brink Poudre Canyon classic. The crux is right off the deck, tackling steep, overhanging tips-fingers. The grade is kept at 11d due to decent feet. After the intitial crux, the crack gradually widens...thin hands, hands, traverse, wide hands, fists, and ends with OW. Superb climbing. ...[more] Browse More Classics in CO