Hi Amy,
I also live in Wi; ( Hayward), and my chickens didn't really want to go outside either, but today since I knew it was going to be around 20 degrees, I shoveled out their run a little, and then put down some bedding so they could walk around on that. I sprinkled some of their feed out there too, and sure enough they were out most of the afternoon! They seemed to be happy not to be "cooped up" anymore, which was due to our bitter cold we had been having. More snow on the way tomorrow though!!