Low to mid 50s? Thats cooler than I would have thought, but when my daughter moves out next week I can use her room as a hibernaculum. 
I also have some rubber boas and a corn snake that need to be cooled. I have moved the rubber boas to the garage already, but will probably move them to the spare room, since I can control the temp there better.
I will probably leave a pair of alternas together for the winter, since they have been together for over a year. Then I will separate them in the spring, since that particular female will still need at least another year of growth before she is big enough to breed.
Yes I was planning to wait a couple more weeks to make sure they have finished digesting their last meals.
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Kent
0.1 Hypomelanistic striped cornsnake
1.1 Hypo (het lavender, striped) cornsnake hatchlings
2.2 Normal (het hypo, lavender, striped) cornsnake hatchlings
1.2 Gray-banded kingsnakes, blairs phase
1.1 Oregon rubber boas