Some parts of Willow Spring Trail are much higher up than other parts of the trail, and that means that some parts of the trail could be very different from other parts of it. Keep in mind that this is a long backpacking trail, so make sure you bring plenty of supplies. The time needed for this backcountry walk is roughly 7 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. The total elevation difference for this wilderness trail is 1,533 feet which is an average number. This backpacking trail sometimes gets very dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. With its 8 miles of walking distance it's a mid length walk. There is only one trailhead, so you'll be backcountry backpacking it in and back out.