Jasper Peak (or Mount Jasper) is a 12,923-foot peak in Colorado's Indian Peaks Wilderness, located on the boundary between Boulder and Grand Counties, known for ski mountaineering and challenging hikes with unmarked sections. The area offers varied routes, including the popular Fourth of July Trailhead access, and features the interesting landmark of Lake Xanadu, where a plane crash occurred. Visitors should be prepared for off-trail navigation, consult the Colorado Water Trust for wilderness regulations, and carry a compass and map or GPS device.