I would say it depends on breed, and climate. Animals acclimate very well, so if you have cold winters your chickens should adjust. Today's high was -19 C/-2 F and my flock was outside all day (by choice). That's a pretty normal winter temperature here, and there was no wind chill. We have long, cold winters (the snow and cold hit here in mid-October and will melt in April). They get used to it.
I don't heat my coop. For our climate, I personally don't think it's a good idea as they won't acclimate to the cold if you do. They do have a nice insulated coop full of straw though, and for my convenience they have heated water dishes We'll get down to -40 in winter, and in those extreme temperatures I will put extra straw in their coop and don't open the door in the morning. They don't want outside in those type of temperatures anyways (and I don't blame them!), but they stay pretty cozy and comfortable in their coop even without a heat lamp.
I have cold hardy breeds though, and I think that makes a big difference. I have a friend with Silkies and they don't seem near as cold resistant as my birds.
That being said, as mrsjohnson said, when it's around -20 C/-4 F, eggs freeze pretty quick even in laying boxes full of straw. We do find a few frozen eggs if I'm not out there fast enough. Many of them expand and burst the shells lol
I don't heat my coop. For our climate, I personally don't think it's a good idea as they won't acclimate to the cold if you do. They do have a nice insulated coop full of straw though, and for my convenience they have heated water dishes We'll get down to -40 in winter, and in those extreme temperatures I will put extra straw in their coop and don't open the door in the morning. They don't want outside in those type of temperatures anyways (and I don't blame them!), but they stay pretty cozy and comfortable in their coop even without a heat lamp.
I have cold hardy breeds though, and I think that makes a big difference. I have a friend with Silkies and they don't seem near as cold resistant as my birds.
That being said, as mrsjohnson said, when it's around -20 C/-4 F, eggs freeze pretty quick even in laying boxes full of straw. We do find a few frozen eggs if I'm not out there fast enough. Many of them expand and burst the shells lol
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