Hello! This is my first winter with my 6 girls (3 black sex-linked and 3 RIR's) in Western MA. I am a bit worried about my RIR's because they are still young - about 10-11 weeks. They've been outside since they were fully feathered, but I think they are getting cold because they will not come out of the roost area in the mornings (maybe it's because they have recently moved in with the big girls and they still don't get along all that well yet?). It looks like we will be getting our first frost this week and I am a bit worried that I haven't winterized my coop yet.. We just bought this coop off of friends who have upgraded. My plan is to cover the bottom half with something, I'm not sure what yet... I have been trying to slowly remove all plastic from our lives, so I don't really want to use that, though it seems like that is what everyone is using. In the end I will probably use wood or glass, though glass could be dangerous if it breaks? We are going to attempt a deep litter on the currently dirt floor and put sand in the poop tray to make cleaning poop easier for myself when it gets really cold out. There is a small sliding door window on the roosting area (not pictured) that I don't think I should have open during the winter - it is at "bird level" and I worry it'll be more of a draft window than a ventilation window! I'm thinking of drilling some holes in the top portion.. Also I hope to maybe add an extension to the coop so they have more space to roam when the snow comes. I've heard chickens don't like to walk on snow, so I'm going to try to give them as much dry ground as possible. I think I'm going to have to detach and reattach the door so that it will open instead of out, that way I don't have to shovel in front of the door every time it snows. Does this sound like a good plan or am I over-doing/overthinking? I know chickens are cold hardy, but I worry about my girls! I check on them multiple times a day and at night to make sure everyone is okay. I really do not want to use a heat lamp - when we used one for brooding, our electric bill shot through the roof. I hope my plans will be enough to keep them warm when it goes into the negatives. Any thoughts?
*Side note- the coop pictured is a stock photo of one that looks exactly like ours*