The total elevation difference for Rattlesnake Trail is 1,110 feet which is an average number. Rattlesnake Trail is a one trailhead hiking and backpacking trail, so you're looking at an in and out backcountry walk. This is a hiking and backpacking trail that is quite long, so do pack enough food to last the whole trip. You spend the whole backcountry hike in roughly the same elevation zone which means the conditions are about the same from start to finish. Being 6.4 miles long it's an average length backcountry trail. This backcountry trek shouldn't take more than 5.5 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. At parts of the year this region sees very little rain, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire.