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Adult, fully feathered chickens that have been allowed to adjust to the seasons naturally, and have a draft-free coop will do just fine at your temps. I keep about 30 birds in my 8x8' coop for their body heat... you will be surprised how much heat those birds put off! I have a heated water base for the 3 gallon galvanized waterer, and that kept the water fluid for them. The only birds I had any troubles with at all with the cold were the youngsters. The 3 month olds could not stay warm without extra heat, so I wound up bringing them inside. The only time the birds are in the coop is when they're sleeping, eating, drinking or nesting... if you have a big run for them, they will have plenty of room, and the smaller coop will help keep them warmer in the extremes of winter. Your chicks will be full grown by the time the snow flies. Watch how they react as the temps start getting colder... if they're out and about running around, just keep the water from freezing. If you see them start huddling together, standing on one foot, and just plain looking miserable, then you'll want to add a little heat or extra bedding, etc. You'll know when they're cold. Ours are usually outside running around to 0 to -10F. Anything lower than that, or windy, and they tend to stay on the roosts. But I have two pop-doors covered with towels that they can go in and out of, and I never blocked those off. They all did fine, even at -35F.
Your chickens will naturally grow thicker down and feathers to help with the cold temps. Both of those breeds do really well here.
Tell us a little about your setup, or what you plan as your coop/run...
Oh we are soo bad!! We dont have coop yet. But we have to build a barn this summer for our goats neways. At night right now I am bringing in my goats cause one is only 3 months old. The other is soo thick that she did just fine in -30 temps in a mini insulated shelter. We plan on having the chicks inside till they are old enouph or have enouph feathers(in my masterbathroom it is huge hehe) Then if wheather is still not warm enouph we will put them in our shed temp with heat lamps bedding ect.. My husband plans on starting the barn as soon as possible Half will be for the goats other half a coop type set up for the chickens.He plans on making it as insulated as possible but not too exstreame. And on the chicken half of the barn will be a run off of it for them. but they will also be part time free range we have a huge area fenced off from pretators. used to having heaters for water becuase we had horse that we recently got rid of. I have out door heated water line so I dont have to haul water YAY!!!My husband is very crafty so im sure he will build them a more then suitable home. I read on one of your other posts that you use the seasaws with wood on top I like that idea and might try somthing like that so they can get out in the winter. We also have outdoor electricity accsess so if some type of heating is needed in the barn that is taking care of. I believe he is making the barn no smaller then 10x12 I know of a lady with 2 goats and chickens in much smaller area but I want my chickens and goats to be happy. Before winter hits we will probly be down to 20 or so chickens because the cornish will be full grown and rdy to butcher. We want chickens mainly for the eggs we go through 3 18 packs every week in a half!!! so im sure 20 layers will give us plenty with left over to sell or give to family. we dont eat chicken that much.