I'm in KS near KC as well. I keep my turtles in a Waterland tub all summer, then bring the whole setup into my basement for the "winter months" (depending on how soon consistent temps in the 30s happen). The basement is generally in the 50s during that time. I keep an incandescent lamp for heat (on a timer with decreasing photoperiod) for two weeks after their last feeding, then turn off the lamp for about 6-8 weeks. They have constant access to water and occasionally a turtle or two may soak for extended periods. I weigh the turtles periodically and some actually gain weight over the brumation period.

Your original question was whether an above-ground outdoor brumation box was a viable option. I wouldn't recommend it; an above-ground box won't afford the protection from freezing that digging below the frost line does. Others' experiences may vary but personally I wouldn't risk it. Do you have a basement?
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Chris McMartin
www.mcmartinville.com
I'm Not a Herpetologist, but I Play One on the Internet

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