Next week I will be receiving my first 5 chicks. I had intended to get their coop started earlier but I've been having trouble weighing the pros and cons of the various designs. We plan on tractoring them, as we are in an urban area and can't free-range, but are concerned about winter weather. We are in central NY so have a pretty good range of temperatures with very cold and snowy winters. All the breeds we purchased are supposedly cold-hardy (buff orps, EEs, Delawares and Black australorps), but I'm worried we'll end up with full grown chickens in our bathroom in the middle of winter! With what designs/styles of tractors have those of you in colder climates had good results? Or any recommendations on sites/books that have good information about building a cold-weather friendly tractor? We've really got to get going on getting a home built for the girls so any help would be greatly appreciated.