Rhodes are about four weeks. some may only be around three, They were mixed when I got them. The local coop had them for 50 cents each. I have not raised chickens since I was a child, about 40 years ago. I just bought a farm with 12 acres. I am in Indiana and the temps this year are not being nice. It is supposed to be between 55 and 58 most of the week, I need to get these gals out to the barn. Can I get them out in the yard for a bit at these temps?