This great outdoors hiking trail has only one trailhead, so you'll be backcountry trekking it in and back out. Now this backpacking and hiking trail is pretty long, so don't forget to pack enough supplies. Now, this is roughly a 3.5-day backcountry hike, so better have big a backpack to fit all the stuff you need. With its 24.8 miles of walking distance; it's longer than many backcountry hiking trails. Different parts of this backcountry hiking trail are at very different elevations, and that means that some parts of the backcountry hiking trail could be very different from other parts of it. Rainbow Lake Trail has a total elevation difference of 6,260 feet which is a higher than average number.