A lot of guys here in Ohio will drain the water at end of season and fill with anti freeze mix for winter, then drain flush fill with water for the season. Little extra time but may save damage.
That's what I do here in Akron Ohio. I don't trust just draining it, there may be a spot or two that still has water that could freeze and cause problems. I put antifreeze in mine for the winter and I like to fire it up every couple weeks whenever the temp gets around 40 degrees.