This outing begins at the Redfish Trailhead off Redfish Lake Road just before you get to the lodge. Thompson Peak is the highest summit in the Sawtooth Range and it's clearly visible from the highway. There are quite a few different routes to take to reach the summit; this approach will climb up the Northeast Face. This route will climb up the large couloir that splits the face and reaches the summit on the north ridge. You'll climb the right side of the couloir for several pitches, enter a chimney, then an alcove, and finally a crack system. The rock material in this area of the high Idaho batholith includes high grade metamorphic rocks and gneiss. You'll need a Sawtooth National Forest pass to park in the parking lot, or use a Golden Eagle pass. Also a free self issuing wilderness permit must be filled out at the trailhead. Lat/Lon: 44.141524, -115.009844