As was mentioned, corns don't need brumation to breed, but lots of folks brumate them anyway, including me. The hardest places to brumate are in s. FL, where it doesn't hardly ever get cold enough, and in some of the desert states, where it is too dry. Here's what I would do. Brumate for two months, or less, at temps bt. 55 and 75*F. Make sure your snakes are hydrated at all times. I think they do better with no light and no disturbances, except the occasional check on their water, temp, etc. Even in the low 70's they shouldn't have any trouble getting through eight weeks of rest and recycling. Brumation is best thought of as a metabolic break, imho, and snakes don't necessarily need cold temps to get them to shut down. We just have to care for their needs when they are shut down.
Terry
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Ratsnake Haven: Calico and albino Chinese stripe-tailed ratsnakes, Mandarin ratsnakes, Chinese twin-spotted ratsnakes, South Korean Dione's ratsnake, and Great Plains ratsnakes 