Alta Lake Trail has only one trailhead, so you're looking at an in and out walk. Alta Lake Trail is 13.8 miles long; it's considered a longer backcountry hike. Different parts of Alta Lake Trail are at very different elevations which of course means you need to be prepared for different conditions on different parts of the hiking trail. Sometimes this backpacking trail gets really dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. Alta Lake Trail has a total elevation difference of 3,119 feet, and that is higher than average. This walk should take you about 2 days, so make sure you've got all your overnight gear packed. Alta Lake Trail is quite long, so don't forget to pack enough supplies.