As the temperatures begin to cool and the days grow shorter, many nuisance animals start preparing for the months ahead. Depending on where you live, the wildlife activity you experience can vary significantly. In warmer southern climates, animals may remain active for much longer. In regions with harsher winters, wildlife faces greater pressure to find food, shelter, and protection before cold weather arrives.
Understanding what attracts nuisance wildlife during autumn can help homeowners identify potential problems before they become costly infestations.
Bats: Autumn Is Prime Exclusion Season
Early autumn is one of the best times to address a bat infestation. The most effective, legal, and humane method for removing bats from an attic is exclusion, which allows bats to leave but prevents them from re-entering.
By September, bat pups are typically able to fly, making it safe to install one-way exclusion devices, often called bat valves. Timing is important, however. In the United States, bats either migrate or hibernate during the winter months.
If your attic housed a migratory bat colony, winter provides an excellent opportunity to repair entry points and wildlife-proof your home before bats return. If bats are hibernating in your attic, sealing access points during winter could trap them inside. In those cases, exclusion and repairs should wait until spring when temperatures rise, and the bats become active again.
Mice and Rats: Always on the Move
Unlike many wildlife species, mice and rats remain active throughout the year. As autumn approaches, rodents focus on gathering food and establishing safe shelter for the winter.
Homes provide everything rodents need: warmth, protection from predators, and easy access to food sources. These determined pests can squeeze through surprisingly small openings, making it important to inspect foundations, utility penetrations, and rooflines for potential entry points.
Once inside, rodents can contaminate food, damage insulation, and chew through wiring, creating both health and safety concerns.
Squirrels: Searching for a Safe Nest
Squirrels are particularly active during the fall. Many squirrel species can produce two litters each year, with the second arriving in late summer or early autumn.
As temperatures cool, squirrels look for secure nesting locations close to reliable food sources. While they naturally build nests called dreys in trees, attics and chimneys often provide an even more attractive alternative.
A squirrel infestation can lead to damaged insulation, chewed wires, and costly repairs. Homeowners who hear scratching or running sounds in the attic should consider having the area inspected to determine whether squirrels have moved in.
Raccoons: Preparing for Winter Dens
In colder climates, raccoons spend autumn preparing for winter by increasing their food intake and locating a suitable denning site.
Common den locations include:
- Under decks and porches
- Inside attics
- Chimneys and fireplace flues
- Crawl spaces
While raccoons may seem harmless, they can become aggressive if they feel threatened or cornered. They can also cause significant structural damage while attempting to gain access to a home.
In addition, raccoon droppings may contain raccoon roundworm, a parasite that can pose serious health risks to people and pets. Because of these risks, homeowners should avoid handling raccoons or their waste and instead contact a wildlife professional for assistance.
Snakes: Following the Warmth
As cold-blooded animals, snakes become less active when temperatures begin to drop. Once temperatures fall below approximately 60°F, many snake species start seeking warmer environments.
Occasionally, this search for warmth leads snakes into attics, crawl spaces, sheds, and storage areas. Fortunately, snakes typically cause little to no property damage and often leave on their own.
However, a snake’s presence can indicate another issue. Snakes are frequently attracted to homes with a rodent population. If snakes are repeatedly appearing on your property or inside your home, it may be worth investigating whether mice or rats are providing a food source.
When to Call a Professional
Whether you’re dealing with bats in the attic, rodents in the walls, or raccoons under the deck, nuisance wildlife problems are often more complicated than they appear. Improper handling can lead to property damage, health risks, or recurring infestations.
A wildlife control professional can perform a thorough inspection, identify how animals are entering the home, and develop a comprehensive plan for removal and prevention. The goal isn’t simply to remove the animals currently present but also to ensure they cannot return.
As autumn arrives, taking proactive steps to inspect and protect your home can help prevent unwanted wildlife from making your house their winter home.