There's at least 4 of us Michiganders on this thread now. Are we taking over? 
 
  @Candiru09
@Candiru09
This will only be my 2nd winter with chickens but this is how we winterized the run last year:
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This year we've expanded a bit, but we'll end up doing essentially the same thing with the landscaping cloth wrapped around the bottom. The stuff above it is greenhouse plastic. The landscaping cloth lets a little air through and the greenhouse plastic traps heat. There are windows cut into the cloth and the plastic so we can open them and allow for a breeze on nice days and during summer.
Here's what we have to work with this year. Need to make some alterations before we winterize.
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(That is one tomato plant, by the way. It's dying now from the cold but the thing was massive. And we didn't plant it, it grew from a seed from a plant we had there a couple years ago. The ones we did plant this year didn't do well at all, go figure, LOL)
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Good morning!
So, the litter in the "main" run (the winterized portion) was originally just dirt. Last fall I added a good layer of leaves, to give the girls something to do but also to keep the ground from freezing. They broke it down within a few weeks. I'm going to have to get off my butt and rake a ton of leaves for this winter soon. I don't think we're going to be having a mild winter again this year, at all... 
 
I use wood pellets in their coop and just dump the soiled pellets on the ground in the run. As they get wet and break down it basically becomes sawdust. The girls love to bathe in it when they're stuck inside for winter or on bad weather days. And the composting process of pellets + poop + leaf litter keeps the ground relatively warm thru winter, compared to the air. Chicken feet appreciate that.