The last three years, we've departed Ohio in late January, picking a day when we can sneak out between snow and ice. We typically stay in hotels until past Atlanta on the way down. We visit family southwest of Atlanta on the way down in January and on the way back at the end of February or very early March. Last year, just west of Atlanta around March 1st, the temps got well down into the twenties at night while we sat there waiting for safe highways in Tennessee. We try to minimize carrying things that could freeze and cause problems, but typically carry canned goods, liquid soaps, etc. contained in something in case a can or jar bursts. So far, no real problems. When camped in the 20s, we bring in the water hose and use on-board water. When to re-winterize just depends on the weather forecasts, but we usually have to do it before arriving home.