I have 26 RIR and White leghorn chicks that are in a brooder in the garage. They are just a couple days shy of 3weeks old. When can I put them outside in a pen for a few hours during the day? Its about 80-85 degrees here now. I have no other older chickens to worry about to pass a virus etc, so as long as it's hot out would they be safe? Thanks. I am located in Virginia.