Jagged Mountain is a 13,830-foot summit in the Needle Mountains of southwestern Colorado, within the Weminuche Wilderness of San Juan National Forest. A Colorado thirteener, it is especially noted for the difficulty created by its steep, broken form and remote location rather than for elevation alone. Its recorded climbing history began in August 1933, when five San Juan Mountaineers led by Dwight G. Lavender made the first ascent from the south. Lavender judged it the most difficult peak yet climbed in the Colorado Rockies. In 1934, Bill House and Elizabeth Woolsey opened a new route and found the north-side descent that later became the standard way down.