I just got some new hens from a farm where they were with Roos. How long with they eggs they lay be fertile eggs? Could the hens hatch chicks this late in the year if I leave them their eggs? I should be able to tell these eggs apart since I got Black Copper Marans and Ameracaunas and my original girls are Comets. It would be really cool if I had chicks but they wouldn't hatch until almost December, and then wouldn't be fully feathered until January sometime. Would the hens actually be able to successfully care for chicks this late? I do not have a heated coop and live in upstate NY. I'm tempted to incubate them myself, but then I have that same problem... They'd outgrow a box before the temps would hit 60. Should I just not entertain the idea and collect the eggs?