The Spy is a cool little fin of rock that sits under the NE corner of the First Flatiron. It is difficult to identify as a separate rock from Boulder.
From Gregory Canyon head on the trail to the First Flatiron. Turn off north when you get to a junction marked "First Flatironette". If you reach the base of the normal East Face route you have gone too far. Head north under the First Flatironette to its north end. The Spy is connected to the First Flatironette at its base, but you should see that it becomes a separate pinnacle above.
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Mountain Project's determination of some of the classic, most popular, highest rated routes for The Spy:
East Ridge 5.3 R Trad
Featured Route For The Spy
East Ridge 5.3 R CO : Flatirons : ... : The Spy
Another fun Flatiron route with a reasonably short approach. This climb is approximately 300' long. The bottom of the east face of the Spy is connected to the north edge of the First Flatironette. Climb this face near it's north (right) edge to a five foot vertical step, where the Spy becomes a separate rock. Climb over the step either on the left (5.3) or right (slightly harder).Now follow the narrowing arete to the summit. Very exposed and not much pro. Since you are on a narrow fin, a f...[more] Browse More Classics in CO