Looking at the
Average temps in Columbus for March-April: Looks like you'll only have to worry about the first few weeks, and even at that probably only a few nights where it will get below freezing.
I don't think I'd worry at all about winterizing the coach. There are a few things that you'd want to do on the nights that are forecast for below freezing though (put some water in the tank for overnight use, turn off and unhook the freshwater line so it can drain, close the grey valve--you shouldn't leave the black tank valve open anyway).
Oh and if you're in the Columbus area make sure you take a tour through the Hocking Hills parks..beautiful.
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