Then cross a dangerous, steep scree and snow slope to the western base of the crown-shaped summit pinnacle. From there, scramble up a steep chute to the top. North Sister has ten other named routes, ranging in difficulty to III-5.2. Most are too dangerous to attempt in summer, and have only been done in winter when the loose rock is anchored by rime ice. Many hikers wander up Middle Sister from the Sunshine area of the Obsidian Trail.
Most accidents result when hikers are unprepared for the exposure and length of the climb.
Climbing Broken Top is only slightly more difficult, calling for level I-3 skills. They're available at most Forest Service offices and outdoor stores. At the same time, pick up a local topographic map, entitled Three Sisters Wilderness, published by the Forest Service. Permits are also required to enter the Wilderness, but they're free and can be filled out at the trailhead. Maximum group size in the Wilderness is 12.