If a colony is light on winter stores emergency feeding is in order. I do feed dry sugar using a 1 x 2 frame, putting wax paper on top of the frames and pouring sugar on the wax paper. Heaping the sugar on one end, filling up the frame. I leave the end open so the bees can move up into the sugar if they need the feed. The frame does not need the cross supports like in the picture. This was a frame for using formic acid pads. But it works well for feeding sugar. It is easy to heap up 10 - 20 lbs of sugar. Sugar can be easily added later if need be. The bees will chew up the wax paper and more will need to be added if more sugar is added later in winter.
I do cover the hive with a black winter cover. The hole on the cover usually needs to be elongated to accommodate the added height of the wooden frame.