This hiking trail has only one trailhead, so you're looking at an in and out backcountry trek. The total elevation difference for this hiking trail is 735 feet, and that is lower than average. Olallie Trail stays roughly within the same elevation zone the whole time, so you get pretty much the same conditions along the whole backcountry trail. Keep in mind that this is a long backcountry hiking trail, so do pack enough food to last the whole trip. This backcountry trek shouldn't take more than 9 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. This vicinity 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. Olallie Trail is 10.4 miles long; it's considered a longer trek.