We only had two hives entering winter! Both made it through the worst of winter….one low of -38 F, quite a few -20 to -30's and 4 to 6 weeks straight of lows below zero.
After surviving all of that, we lost one hive…..really bummed.
I gave them both sugar cake (6 to 1 mix) on a warm day when they were making cleansing flights.
Within a week or so …..one hive was dead!

I'm concerned that the sugar cake may have done it as there were signs of extreme (IMO) diarrhea!
Really bummed to see them survive a bad winter…..only to die as things were starting to get better! memtb