This trail has only one trailhead, so you're looking at an in and out walk. 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. The total elevation difference for this trail is 2,265 feet which is about average. This great outdoors hiking trail sometimes gets very dry, so make sure you check current conditions and fire restrictions with local forest authorities before you head out. This is a long great outdoors hiking trail, so don't forget to pack enough supplies. Waldo Lake Trail is 10.6 miles long; it's considered a longer backcountry walk. The time needed for this backcountry trek is roughly 9 hours, but of course some folks walk a bit slower and some a bit faster.