Beginning at Scott Trailhead on the north side of Highway 242, Scott Trail #3531 heads east, crossing Highway 242 before entering the Three Sisters Wilderness. The trail continues through a meadow and an alpine forest of lodgepole pine and hemlock trees before starting an uphill climb north of Frog Camp Creek. The trail levels out before crossing through an old lava flow, then follows the flow up to a viewpoint of Four In One Cone and mountains beyond to the north. Passing the viewpoint, Scott Trail #3531 continues east, re-entering forest and heading uphill before dropping down a hillside into a large alpine meadow where it ends at Pacific Crest Trail #2000.
This trail may be used as a route for travelers accessing the Obsidian Limited Entry Area. Limited Entry Permits for the Obsidian Area are required in advance of trip. There is parking space at the trailhead for stock truck/trailer combinations.