November 21, 2017
Just to reiterate what some of the other reviewers said, this is one of the toughest trails in DFW, and you will want to be in really good shape before attempting it. On your first time out, this trail might seem confusing, and beginners might be turned off by the big climbs, rough terrain and constantly switching elevation. But once you've completed a full lap of everything this trail offers, you'll know you either love it or hate it.
If it's your first time here, you might want to stick to the east side of the trail (AKA Thunder Road). It's the "easier side", and it has lots of "bail out" points if you can't continue, and its easier to navigate. Terrain on this side is rocks, rocks, and more rocks. Probably 80-90% of the east side is covered in rocks of all sizes. There are also lots of small drop offs, roots, tricky switchbacks, and many short ride-arounds/alternate paths to vary things up. The first two red loops (Candy Bar and JoJo's) each have a very big and rocky climb that most people will probably end up walking, but the rest of the east side is easy enough that most riders won't have to get off their bike much or at all.
The West side (Dam Drop and Lone Wolf) are significantly harder. Dam Drop is primarily downhill action, and Lone Wolf is a mixture of steep climbs and just as steep downhills. Put together, they make up around 5-6 miles of trail, but there are a few shortcuts which can cut a few miles off, and a few bail out points where the trail runs along Cahoba drive. If possible, ride with someone who knows the trail your first time. There are many "fisherman's trails" that intersect with the bike path that will confuse most people, and to make things worse, this part of the trail doesn't appear on most map and sport tracking apps. All that being said, there aren't many trails around DFW that will test both your skills and endurance like this one does while still putting a smile on your face.
Two final thoughts...
1. This trail is best suited to full suspension bikes.
2. If it's your first time on Lone Wolf, wait until the colder months to try it. This trail is absolutely brutal in the Texas summers.
East side is like Knob Hills, but way more rocks. West side is like a harder Quanah Hill.