Boulder Lake Trail has a total elevation difference of 2,971 feet which is a higher than average number. Boulder Lake Trail has only one trailhead, so you're looking at an in and out backcountry walk. This backcountry walk should take you about 1.5 days, so it's a nice thing if your backpack is big enough to do the job. Different parts of this backcountry hiking trail are at very different elevations, and that means that some parts of the backcountry hiking trail could be very different from other parts of it. Now this hiking trail is pretty long, so make sure you bring plenty of supplies. Being 11.6 miles long; it's a long backcountry hiking trail. This hiking trail sometimes gets very dry, so donít forget to check for any current fire restrictions before you go.