Simpson Meadow Trail is a 22.9-mile, one-way wilderness traverse from the Copper Creek Trailhead at Road’s End to the junction with Upper Middle Fork Kings Trail near Simpson Meadow. That total includes the 10.9-mile approach to Granite Pass and about 12 miles of trail north of the pass. The route climbs above 10,600 feet, then drops through high meadows and steep, loose tread toward the Middle Fork. This isn’t a loop or a day hike: allow about two days of walking, plus camp time. Overnight trips require a wilderness permit, and you’ll need a plan for animal-resistant food storage. There’s no road at the far end, so arrange an onward wilderness route or a return plan before setting out. The shorter 13-mile figure describes roughly the pass-to-river section and leaves out the Road’s End approach.