While I feel it's unfair that people have rated this trail/open space low because they charge a fee, I am a bit surprised how beloved other users have found the Devil's Backbone. It does cost $10 for a daily use pass, which is on par with most state park and other recreational areas that charge in Colorado.

I utilized the southern area of the park, accessing the trail at the US RT 34 entry. From the road, the space looks amazing but the trail(s) themselves were underwhelming. I was hiking and only really had the opportunity to get up close to the interesting stone features at the keyhole. Otherwise, the trail is a bit separated from the backbone for the first couple miles on that end of the park. It is completely exposed and pretty overgrown at this time of year (late Aug). The grasshoppers are out of control at this time too. Every step I took sent a half a dozen or more grasshoppers jumping into me or off the trail.

Overall the valley and the backbone are pleasant scenery but the trail itself was pretty low on the enjoy index for me with so many other great hiking options in the front range. I wouldn't bother returning.