Your girls look just like my four... all snuggled together nicely! I live east of St. Paul and this is my first Minnesota winter with chickens so this extreme cold spell does have me concerned, too. I don't heat their coop but it has a lot of ventilation so is nice and dry. I've covered the north and west run walls with plastic to block the wind and even with the really strong winds we had today they all spent the entire day in the run pecking around like usual. I generally leave the pop door open at night but have been closing it the last few days. I'm not sure if I really need to but it makes me feel better to close it!...and here we go...
Currently -16F outside, and -3F inside the coop. Chickens are bedded down for the night. I hope to NOT find frozen chicken in the outdoor freezer in the morning.
Here they are snuggled up near each other.
View attachment 1657491