Along the same thinking as above poster: hungry chickens are much more willing to comply with your wishes. If you take the feed away at night, and then feed them in the area you want them to spend their day, they will be very likely to run to where ever you want them to be, especially if you shake a can of scratch, and toss a few grains ahead of you as you go. I predict you will have them trained in less than a week. Be sure that front yard has plenty of places where they can hide from predators.