Join Date: Feb 2010
Location: Loudoun County, VA
It will probably take some time to cure him of this.
He feels that the barn is a safe place, where he gets pampered and gets to relax. What you need to do is start working him around the barn, to lessen the incentive to want to go to the barn. School near it sometimes, and when you get on trail rides, don't just dismount when you get back. Stay on another 15 minutes and make him do some work around the barn.
You also need to work on reinforcing your "go" cues so he will listen when you ask him softly to go. Work on this with him when you aren't going on a trail ride. Start with asking him softly to go, and then increase the pressure when he doesn't go, building up to swatting him with a crop if he won't move. I would suggest one soft squeeze, then a firm squeeze/kick, and then swat him with the crop. When he responds well to the soft squeeze, then try him at the hill, using the same methods.