This backcountry hiking trail sometimes gets very dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. This backcountry hiking trail has only one trailhead, so you'll be backcountry backpacking it in and back out. Grayback Trail is 3.6 miles long it's shorter than many backcountry trails. You should count on this trek taking about 3 hours, but of course some people walk a bit slower and some a bit faster. This backcountry hiking trail is not that long but it's always great to bring some emergency supplies, you never know what could happen. Different parts of this backcountry trail are at very different elevations, and that means that some parts of the backcountry trail could be very different from other parts of it. The total elevation difference for this backcountry hiking trail is 2,268 feet which is an average number.