Where Do Opossum Go In The Winter?

Opossums get filed under "hibernates like the other small mammals" almost automatically, and it's exactly backward. Rather than sleeping through the cold, the Virginia opossum has to keep foraging through every winter month because it carries almost no fat reserve and doesn't build a food cache to fall back on the way a squirrel does. Winter isn't a break for an opossum. It's an ongoing survival test, and New Hampshire — near the northern edge of the species' range — is one of the harder places to pass it.

Opossums don't dig or build their own dens; they move into whatever's already there — a hollow log, an abandoned woodchuck burrow, a rock pile, or the dry space under a shed, deck, or porch — and line it with leaves carried in using their prehensile tail. That opportunism is exactly why an accessible outbuilding is as attractive as a natural cavity in the woods.

The visible cost of the strategy is frostbite. An opossum's ears and tail are bare skin with no fur or scale protection, and sustained New Hampshire cold genuinely damages that tissue. Biologists use the degree of tail loss to age northern opossums — a shortened or scarred tail generally means the animal has already survived at least one full winter.

Hibernation would actually help an opossum — it's the option this animal doesn't have. It can't suppress its metabolism enough to sleep through extended cold, so it has no choice but to keep venturing out to forage, and it only dens up and goes quiet once temperatures fall into roughly the high teens to mid-20s Fahrenheit. That's not dormancy in any physiological sense; it's an animal waiting out conditions too dangerous to move in, which is a fundamentally different — and harder — situation than a hibernator's engineered, metabolically-suppressed sleep.

A widely repeated, well-meaning claim holds that a single opossum eats thousands of ticks a season, effectively acting as a natural pest-control service. It's a nice story, and it doesn't survive a closer look: a 2021 peer-reviewed review in Ticks and Tick-borne Diseases (Hennessy & Hild) examined the stomach contents of 32 wild Virginia opossums and reviewed 23 prior diet studies, finding zero ticks across all of them. The popular '5,000 ticks' figure traces back to a 2009 laboratory study of captive opossums grooming ticks off their own fur — a measurement of self-grooming behavior, not of what a wild opossum actually eats in the field. Opossums remain a generally beneficial, non-aggressive scavenger of carrion, insects, and rodents; tick control just isn't the honest reason to value having one around, and we'd rather say that plainly than repeat a figure that doesn't hold up.

Believing opossums 'hibernate and disappear' produces two specific mistakes. The first is mistaking a daytime opossum for a sick or rabid animal, when it's far more often just an animal that's shifted its foraging schedule toward the warmer daylight hours — genuine rabies in opossums is rare, and their unusually low body temperature is widely cited as part of the reason. The second is writing off a harmless, non-aggressive native as a pest problem to be solved, when the honest answer for most homeowners is simply tolerance, with exclusion reserved for the rare case where one has genuinely denned somewhere it shouldn't.