I thought of this later after I posted, but this time of year, there are lots of people who have either older hens or point of lay pullets. I have both in my coop right now. You might consider contacting the local poultry club or the county extension agent for people that have chickens near you...
Keep them in the garage with a heat lamp. Once they are featherered, raise the heat lamp each day a little higher. Let them out in the run for a couple of hours in the warm part of the day for a couple weeks, back in as the sun goes down, then move them out to the coop. If you acclimate them a...