It’s vital to blow out the pipes on an in-ground pool. Call a professional if you’re uncertain how to do this procedure—it’s what protects the water lines from freezing. Afterwards, plug the return jets and install a Gizzmo in the skimmer to prevent it from cracking. If you do these few tasks, you don’t have to drain the pool for winter unless you have ornamental tile edging the pool. In that case, drain water 4 inches below the tile.