The trail mostly stays in the range of 4000ft to 5000ft. I started at June Lake on the south side of the mountain and traveled counter-clockwise. I camped along the South Fork Toutle river on the mountain's west side, then finished the trail the next morning. The trail is 28 miles long, plus it's at least a 1.5 mile hike to get to the Loowit Trail from the nearest trailhead. That makes the trip 31 miles... The tread is often over broken lava fields and across slopes of loose ash, making it feel a bit longer.