Boulder Creek Trail is a one trailhead backcountry hiking trail, so in and out is the way to hike it normally. Boulder Creek Trail has a total elevation difference of 3,222 feet which is higher than average. Being 7.2 miles long it's an average length trail. This is a wilderness trail that is quite long, so make sure you bring plenty of supplies. Sometimes this wilderness trail gets really dry, so donít forget to check for any current fire restrictions before you go. Different parts of Boulder Creek Trail are at very different elevations which of course means you need to be prepared for different conditions on different parts of the trail. This walk shouldn't take more than 6.5 hours, but of course some people walk a bit slower and some a bit faster.