My Easterns hibernate with what starts out as about 36" of cover that gradually compacts over the winter. The hibernacula are 18" and 24" deep (in to the ground) and they are filled with a leaf/loose soil mixture and then covered with added leaves. This is my set-up for Central Virginia, which has milder winters than where you are.

More than enough, to be sure, but my philosophy is "Better too much cover than too little." In the spring, I have found evidence (tunnels) that they have utilized the full depth, so I feel vindicated in taking this approach.

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