I also live in Mooresville, NC. and I can assure you it does get below freezing here several times during the winter months.
I'd always recommend winterizing to not just protect against freezing, but also engine corrosion that can be avoided by using antifreeze, and fogging the engine ..as well as using stabil fuel treatment.
See some of the great articles here about the correct way to winterize your machine, so it's ready for Lake Norman in the spring.