I am planning on hatching chicks through the summer, but I want to know when I should set my last batch of eggs. What I need to know is, how old do the chicks need to be before it gets cold in the winter? In NW Alabama, it doesn't start staying cold until about December, however, we will have frost in late October. Usually the average high in Nov. and Dec is in the mid to upper 50's with some 60 degree days scattered in and occasionally a 70ish day. I just don't know when the babies are, "cold hardy".