Lost three due to Polar vortex. I keep all of mine in two deeps for spring splits. We never had Polar Vortex spilling down this far south since 1890, breaking cold records, but it did. Realizing the danger, I had covered them up with a double, large plastic bags, entombing them inside. But three clusters could not move up to the abundant honey above in the second deep, a common phenomenon even in a commercial operation so much so that people often offer a bridge comb in between. I didn't, thinking they would be OK after all this was the first time I wrapped them, ever. I bet your members have had similar experience in their overwintering loss. But all is not lost. I have one gang-buster, among others, filling up into two deeps waiting for April 12 split. I am hoping by then it would fill three deeps. Have been feeding this colony both pollen patty and syrup for about a month now. Unbelievable even a killer cold would impact me like this. But we go on.