We return to Ontario in late March or the first week in April. We haven't winterized until the RV is in the driveway a day or so after we get back. If your RV has heated and enclosed tanks and the daytime temps are at or above freezing you should be good, running the furnace overnight keeps the tanks and pipes warm even if the temps are below freezing. We've seen some folks winterize at Harbortown RV resort in Monroe Michigan but they were heading farther north.
We are currently in Carlsbad NM where it's currently a chilly -9C, we are running off tank fresh water as the cold was predicted (I stowed the water hose before retiring} and the furnace kept the systems from freezing overnight.
