This great outdoors trail has a total elevation difference of 2,681 feet which is higher than average. The time needed for this backcountry hike is roughly 6.5 hours, but you never know stuff could go wrong and you could get stuck so be prepared for that. Bull Run Trail is 7.8 miles long it's a mid length walk. This is a long hiking trail, so don't forget to pack enough supplies. This is a one trailhead great outdoors trail, so you're looking at an in and out hike. This great outdoors trail goes through some very different elevations, and that means that some parts of the great outdoors trail could be very different from other parts of it. This hiking trail sometimes gets very dry, so do check for current fire restrictions before you go if you plan to bring a stove or make a camp fire.