Does Freezing Destroy Bacteria?
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To determine whether you should freeze a casserole before or after you cook it, first ask yourself if it is likely to get dry... Should I Freeze a Casserole Before or After Cooking It?
If only that were true, we wouldn’t have to worry about cooking meat and poultry to a safe internal temperature! Freezing makes bacteria inactive—but it doesn’t kill them. Think of it like those sci-fi movies when people are frozen and wake up in a different century. The bacteria “re-awakens” in warmer temperatures. Hot temperatures will thoroughly destroy them.
For more tips on freezing foods, see our Fill-Up-Your-Freezer Storage Guide.