If they have their feathers, they are fine. I put mine outside a little after mostly feathered. I'm on the gulf coast though, so cold is 60°F.
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Wow! What a great setup. I am limited in how many chickens I can have here, so this will be it for quite a while. I’ll definitely have to look into something like this should the situation arise in the future. Thanks!In the future, brood the chicks right in the coop.
3 different set ups here:
https://www.backyardchickens.com/articles/integrating-new-birds-at-4-weeks-old.72603/