When temperatures drop below freezing in Upstate New York, it's easy to assume that pests disappear until spring. After all, you aren't seeing nearly as many ants, mosquitoes, or other insects around your property.
But where do they actually go? Not all pests die in the winter. Some insects don't survive freezing temperatures, while others have developed ways to withstand the cold. And for certain pests, your warm, comfortable home is the perfect place to spend the season.
Understanding what happens to pests during the winter can help you recognize potential problems and prevent unwanted activity inside your home.
The short answer is that some do, but many survive.
Different pests have different ways of handling cold weather. While freezing temperatures can kill certain insects, others survive by entering a dormant state, finding protected shelter, or remaining active in warmer environments.
Some insects even produce natural compounds that help protect their bodies from freezing temperatures.
That's why a harsh Upstate NY winter doesn't necessarily mean fewer pests the following spring. Many species are adapted to surviving our region's seasonal temperature changes.
And while pest activity may slow down outdoors, the conditions inside your home can allow certain pests to remain active all winter long.
Just because you aren't seeing insects outside doesn't mean they've disappeared. Many spend the colder months hidden in places where they're protected from extreme temperatures.
Depending on the species, insects may survive winter in several ways.
Some insects enter a period of dormancy called diapause, during which their development slows or stops, allowing them to conserve energy until conditions improve.
This is common among insects that overwinter in leaf litter, soil, beneath tree bark, or other sheltered outdoor areas.
Have you ever noticed stink bugs or cluster flies appearing near your windows on a sunny winter day?
These insects often enter homes in the fall, seeking protected spaces to spend the winter. They may hide in attics, wall voids, or other undisturbed areas.
When sunlight warms parts of your home, they can become temporarily active, making it seem like they've suddenly appeared in the middle of winter.
Some insects don't survive winter as adults, but their eggs, larvae, or pupae do.
Mosquitoes, for example, have different overwintering strategies depending on the species. Some survive as dormant adults, while others overwinter as eggs.
This allows insect populations to return when warmer weather arrives.
From our on staff entomologist:
Danielle Restuccia, BCE (Board Certified Entomologist)
While outdoor insect activity decreases significantly during the colder months, several common household pests can remain active.
Rodents don't hibernate during winter. They remain active year-round and often seek shelter in homes, garages, basements, and attics when outdoor conditions become less favorable.
Once inside, they have access to warmth, potential food sources, and protected nesting areas. Because mice can squeeze through openings roughly the width of a pencil, even small gaps around your home's exterior can provide an entry point.
Many spiders slow down or seek protected shelter during winter, but some species can remain active inside heated homes.
Basements, crawl spaces, and other undisturbed areas provide suitable environments, especially when other insects are available as a food source.
Most common household spiders in Upstate New York aren't considered medically dangerous, but frequent sightings may indicate other insect activity.
Unlike many outdoor insects, cockroaches can remain active throughout the winter when they have access to warm indoor environments.
Kitchens, bathrooms, and areas near plumbing can provide the moisture, shelter, and food they need to survive and reproduce.
Ant colonies outdoors generally become less active as temperatures drop. However, ants nesting within heated structures may remain active during winter.
If you're consistently seeing ants indoors during colder months, it may indicate a colony nesting somewhere within or near your home.
Your home offers many of the same things pests need to survive: food, water, shelter, and protection from harsh weather.
As temperatures change, pests may take advantage of small openings around foundations, doors, windows, utility lines, and other vulnerable areas.
It's also important to understand that not every pest you see during winter entered your home recently.
Some insects may have moved inside during the fall and remained hidden for weeks or months before becoming noticeable.
This is one reason homeowners sometimes experience unexpected pest activity in the middle of winter, even when doors and windows have been closed for months.
Yes, depending on your home's needs and the types of pests you're dealing with.
Although pest activity changes seasonally, winter doesn't eliminate the conditions that allow infestations to develop.
Rodents can continue nesting and reproducing indoors, cockroaches can remain active in heated spaces, and overwintering insects may emerge periodically throughout the season.
Winter is also an opportunity to identify structural vulnerabilities, monitor existing pest concerns, and address conditions that could contribute to increased activity in the spring.
A few preventative steps homeowners can take include:
While these steps can help reduce pest activity, established infestations may require professional attention.
Just because you're seeing fewer pests outside doesn't mean your home is completely protected.
At Thomas Pest Services, we understand how seasonal changes affect pest activity throughout the Capital Region and Hudson Valley. Our approach focuses on identifying potential problems, monitoring activity, and helping homeowners stay ahead of pest concerns throughout the year.
Through our Complete Care Program, we provide ongoing pest management tailored to your property and the changing pest pressures of each season.
Whether you've noticed scratching in the walls, unexpected insect activity, or simply want to take a more preventative approach, our team is here to help.
Don't wait until spring to address a winter pest problem.
Contact Thomas Pest Services to learn more about year-round pest protection and find the right solution for your home.