Listen, I'm not a professional but I'm going to have to dispute that last comment and say Yes, you can hibernate res's in Washington. Actually, the colder the better. Res's have been as far North as Illinois, and perhaps even farther. They can exist in South Korea, where there are millions of ferrals, and there it gets down there.

As for your question, I believe you can just let them 'brumate' at the bottom and don't need any dirt. But never mind them wintering outside the water. Some do this but from what I've learned, and if the temps don't get too far below freezing, they should be fine.

Trust me. I'm doing the same in a similar climate and have even seen sliders in Lake Washington there in Seattle. But by all means seek the library or some professional assistance.

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