Update - the hand warmers in towel pockets did not even get remotely warm in -30c. This morning it hit -31, only the second time it’s been this cold here in at least the decade we’ve been here. It’s supposed to stay almost at -20 for several days :/
I added more bedding to the coop and run, the girls were okay this morning, tiny bit of ice on their backs from their breath when they were tucked in I think. They were definitely complaining but had a snack and quickly puffed up their feathers and roosted together in the run once they ate/drank. It’s supposed to be sunny today so at least they will be able to sit in the sunshine in their run in an hour or so when it starts to shine on them.