This backcountry trail has a total elevation difference of 504 feet which is a lower than average number. At parts of the year this region sees very little rain, so donít forget to check for any current fire restrictions before you go. Crain Prairie Trail is quite long, so make sure you bring plenty of supplies. Crain Prairie Trail is 18.3 miles long; it's a long backpacking trail. Now, this is roughly a 3-day trek, so better have big a backpack to fit all the stuff you need. The backpacking trail stays roughly within the same elevation zone the whole time which means the conditions are about the same from start to finish.