Hi, last year I overwintered 4 nucs, lost one. I feed w a frame feeder in the top nuc. In the winter, I placed a 1 inch spacer between the top box and the lid. I basically built a box shaped shim and then laid candy chunks on top of the frames. I then pushed all the nucs together, side by side and placed a piece of 1/2 inch foam across their back sides where the wind hit. The nucs came through well. The one I lost was a late start from Aug.