It will be cold through Friday this week. This is the danger time for colonies in the upper Midwest. Several nights near or below zero. There is more than likely brood in the hives now as queens probably have started to lay eggs.
Bees that are on frames with ample honey stores, should be fine.
If the bees are on a frame that is depleted of honey stores, there is a possibility of starvation. Many beekeepers have put on candy boards with fondant, or winter patties. Hopefully adding this emergency food can get colonies over this spike of cold weather.
For now, it will be wait and see. A week from now, the 15th of February, the forecast high is finally near freezing around 30 degrees. That will be the day to see if the hives have survived.
Long term extended forecast after this week, looks perfect for colony survival.