Rat peeking out of hole. United Pest Solutions talks about what you can do to keep overwinter pests out of your home during the winter months.

It’s the middle of winter, and pests that don’t like the cold, seek shelter, food and water in your home, where it’s nice and warm.  When insects come inside for the winter, there is a term you may hear called  “overwintering.”   Learn what overwintering means, which pests overwinter in the Pacific Northwest, and ways you can prevent them from invading your home.

What Does Overwintering Mean?

Overwinter is a term used to describe organisms, whether plants or animals, that wait out winter. So in regards to pests, an overwintering pest is one that lives through the cold temperatures of winter. They typically find a warm, safe place and stay put until winter passes. Kind of like how a bear hibernates in the winter.

Carpenter Ants

Carpenter ants are larger than most ants here in the Pacific Northwest. They can be black, brown or red. Carpenter ant colonies will typically remain dormant in the winter. But if carpenter ants have found a place to stay warm, say your house or a shed, they may forgo hibernating.

Carpenter ants are one of the most structurally damaging in the Pacific Northwest. They’ll destroy sheds, furniture, and even structural beams. So if you have a carpenter ant infestation, it’s important you contact a pest control technician immediately. You can learn more about carpenter ants in our helpful Carpenter Ants information page.


Spiders are cold-blooded. They can survive cold temperatures because their bodies adapt to keep them from freezing. Think antifreeze in a car. Many spiders will take shelter in sheds, leaf or rock piles, and in tree bark. They are not drawn to a warm home and typically don’t try to get inside of it for the winter. This is a myth. However, if you do see spiders in your home, it’s likely they were already there. You just didn’t see them before.

Spiders like areas that go undisturbed like cluttered areas in garages and basements or underneath furniture. So to prevent spiders from getting inside your home seal up any potential entry points and keep your home clutter-free. Our Spider information page goes more in-depth about which spider species are native to the Pacific Northwest.


Our homes have everything rodents, like rats and mice, need to live comfortably through the winter; food and warm shelter. And because they can fit into such tiny spaces, they can easily infiltrate your home. Not only are these overwintering pests a nuisance but they also pose health hazards as they carry various bacteria and diseases like Salmonella. Rats and mice can also cause significant damage to your home. They will leave their droppings and urine throughout your home, get into your food, and even chew through electrical wires and wood. You can read more about the various types of rodents we have here in the Puget Sound area in our rodent informational page.

Once a rodent has infiltrated your home for the winter, they’re likely going to stay even when spring emerges. Rats and mice are intelligent so these pests are not easy to remove. That’s why it’s important to find a technician who’s highly-experienced in rodent control.

If you are experiencing a pest problem, contact United Pest Solutions. Our certified pest control technicians are trained to deal with a wide range of pests. We’ll ensure your home or business is well protected. We also offer an Enhanced All Seasons Plan, to keep your home pest-free all year round. So contact us today for all your pest control needs!

Overwintering Pests in the Pacific Northwest IN SEATTLE WA - EVERETT WA - MARYSVILLE


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