Grizzly Bear Trail has only one trailhead, so in and out is the way to trek it normally. This trail has a total elevation difference of 3,837 feet which is higher than average. This region does get very dry sometimes, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. Keep in mind that this is a long hiking trail, so do pack enough food to last the whole trip. Grizzly Bear Trail is 25.2 miles long; it's longer than many wilderness hiking trails. Grizzly Bear Trail goes through some very different elevations which of course means you need to be prepared for different conditions on different parts of the wilderness hiking trail. Now, this is roughly a 3.5-day walk, so make sure you've got all your overnight gear packed.