Fuji Mountain Trail is quite long, so don't forget to pack enough supplies. Sometimes this hiking and backpacking trail gets really dry, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. Different parts of this great outdoors hiking trail are at very different elevations which of course means you need to be prepared for different conditions on different parts of the great outdoors hiking trail. There is only one trailhead, so you'll be backcountry backpacking it in and back out. Fuji Mountain Trail is 8 miles long it's an average length great outdoors hiking trail. The total elevation difference for Fuji Mountain Trail is 2,523 feet which is higher than average. You should count on this backcountry hike taking about 7 hours, but of course some people walk a bit slower and some a bit faster.