The total elevation difference for this great outdoors hiking trail is 1,575 feet which is about average. Sometimes this great outdoors trail gets really dry, so donít forget to check for any current fire restrictions before you go. Being 4.6 miles long it's a mid length backcountry walk. Boulder Spring Trail has only one trailhead, so you're looking at an in and out trek. Some parts of Boulder Spring Trail are much higher up than other parts of the great outdoors trail, and that means that some parts of the great outdoors trail could be very different from other parts of it. Boulder Spring Trail is not that long but it's always tremendous to bring some emergency supplies, you never know what could happen. This walk shouldn't take more than 4 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that.