Climb Forbidden Peak or other classic mountains in Boston Basin with local, AMGA certified guides. Boston Basin is one of the most popular backcountry zones for alpine climbing in North Cascades National Park and for good reason: the comparatively short approach paired with the high quality and densely stacked quantity of alpine climbing routes on Forbidden Peak make it a perfect destination for climbers to continue to visit and explore year after year. The iconic Forbidden Peak towers above Boston Basin, a triangular peak with ridges dropping sharply off the summit in all compass directions. Most well known is the West Ridge of Forbidden Peak, listed as one of the 50 Classic Climbs of North America. But the other nearby routes, such as the North Ridge of Forbidden Peak, East Ridge of Forbidden Peak, and the challenging test-piece the Torment Forbidden Traverse offer similarly high quality alpine climbing with a more private experience. Each route in Boston Basin has its unique flair but all have extensive exposure requiring au cheval technique (translated to on a horse, climbers straddle the ridge with one leg on each side) and stunning views overlooking Moraine Lake, nearby Eldorado Peak and the heavily crevassed Boston Glacier.