I live in MN and we decided to plastic up the run to keep the snow out. Granted we haven't have much snow, but the outside ground is as solid as a rock. The inside run is as sandy as normal, which equals happy dirt baths! On the warmer days 20 and up, the water stays outside in the run, which never freezes! I bring it in at night. Here's our finished run, we did uncover a little more plastic for ventilation.
The chickens have been very happy even though there has been no free ranging due to the 3 sets of hawks(2 pair of redtail) hanging around. My neighbor recently had an attack and EVERY time she lets them out, the hawks circle above her flock.

The chickens have been very happy even though there has been no free ranging due to the 3 sets of hawks(2 pair of redtail) hanging around. My neighbor recently had an attack and EVERY time she lets them out, the hawks circle above her flock.