The total elevation difference for Blackwell Trail is 2,286 feet, and that is about average. Blackwell Trail has only one trailhead, so you'll be backcountry hiking it in and back out. The time needed for this walk is roughly 7 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. This region does get very dry sometimes, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire. Some parts of Blackwell Trail are much higher up than other parts of the hiking trail which of course means you need to be prepared for different conditions on different parts of the hiking trail. Being 7.6 miles long it's a mid length backcountry trek. This is a long backcountry hiking trail, so don't forget to pack enough supplies.