Banana bread can be frozen in a whole loaf or individual slices. To freeze, allow the bread to cool completely to room temperature (at least a couple of hours). If freezing in slices, cut the bread into desired slices. Wrap each individual slice tightly in a layer of plastic wrap (or alternatively wrap the entire uncut loaf in plastic wrap). Place the wrapped bread in a freezer bag and remove as much excess air as possible. Freeze for up to 1 month, then thaw at room temperature until soft again.