The North Cascades are home to a huge number of sharp granite peaks with many excellent alpine climbs. With so much to offer and typical alpine approaches, you probably won't find mobs of other people. The granite is mostly very good, offering cracks, chimneys, flakes, roofs, etc. Summer is the time for alpine rock.
The general North Cascades area can be reached either by driving west on Highway 20 from I-5 (although Highway 20 is more often closed than not) or by driving east on Highway 2 to Leavenworth or I-90, then North on Highway 97 and North again on Highway 153, which meets up with the other side of Highway 20 in Twisp.
Mountain Project's determination of some of the classic, most popular, highest rated routes for North Cascades:
This and the neighboring Northwest Corner Route are two of the finest alpine rock climbs I have had the pleasure to yet accomplish. Great movement, committing moves, huge exposure, beautiful position: some of the best climbs in the Washington Pass area.The West Face shares its first pitch with the Northwest Corner, a somewhat dirty face up to a chimney with trees above (5.8). From here, move the belay up 3rd class terrain to a huge sandy ledge at the base of a large corner, the base of the sec...[more]Browse More Classics in WA
The North Cascades are composed of a wide variety of rock types, but primarily Skagit gneiss, not granite. The rock tends to be crumbly, but there are pockets of good firm climbing. Forbidden Peak, Gunsight Mountain, Dome Peak, and Goode Mountain come to mind as being particularly solid. As the pictures above indicate, it is not the rock quality, but the glaciation and alpine ambiance that make this range unique in the lower 48!