The total elevation difference for Willow Trail is 1,081 feet which is an average number. Willow Trail is a one trailhead hiking trail, so you'll be backcountry backpacking it in and back out. Sometimes this backpacking and hiking trail gets really dry, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. There's not much difference in elevation along the hiking trail, so you get pretty much the same conditions along the whole hiking trail. You should count on this backcountry trek taking about 9 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. Keep in mind that this is a long backpacking and hiking trail, so don't forget to pack enough supplies. Willow Trail is 10 miles long; it's longer than many hiking trails.