Bat Hibernation Facts

Bat Hibernation Facts - Illinois Bats

When winter comes, it becomes that time of year again, the season for bat hibernation!

During the winter months in the Chicago area, it is possible for bats to take up residence in your home. And where there is one bat, there is often a colony of bats.

rabid bats

Due to the extreme temperatures during the winter months, there are far fewer flying insects, which means a lot less food for bats.

In order to survive, bats have to hibernate and need a comfortable environment that stays around 35-40 degrees Fahrenheit.

These intelligent creatures have learned attics are the perfect place to ride out the cold.

For professional bat removal call (847) 464-1861


When Do Bats Hibernate?

Bats in Illinois hibernate from late fall until early spring.

They will generally hibernate from sometime in November until sometime in April. Some years they may enter or leave hibernation earlier or later due to weather conditions.

Hibernating bats may come out of hibernation midwinter due to a sudden increase in temperatures that create a false signal that spring is near.

Some bats will come out of hibernation a couple times during the winter to rehydrate, and you may spot them outdoors because of this in December through February.


Where Do Bats Hibernate?

The places where bats go to hibernate are called hibernacula.

Hibernacula can vary depending on the species of bat. The most common hibernation sites for bats include caves, abandoned mines, hollow trees, buildings, attics, and bridges.

In Illinois, there are at least six species of bats that will hibernate through the winter. Other species will migrate south.

Some bats hibernate in groups and some hibernate individually. The preference for hibernating alone or in groups will varyies depending on the species.


How Did A Bat Get in My House?

Because bats are so small, it is not difficult for them to sneak in through a crevice, window, or chimney and move into your attic or basement.

Bats do not always end up at haunted houses! Any home with space, a place to roost, and nearby insects is at risk. If you have a bat in your home, you need a bat exclusion.

Bats are a protected species and this is not something you want to do yourself.

Related: How do animals get in your home?


What Is A Bat Exclusion?

Bat exclusion is the removal of bats from your home. Bats are a protected species under the Illinois wildlife code and any kind of poison or chemical use for removal is forbidden.

Exclusion is a multistep process and requires trained trustworthy professionals, like our technicians at Attic Solutions, who are familiar with the laws and regulations.

Related: Do I need a permit in Illinois to remove a wild animal?


What Kind Of Bats Are These?

While there are approximately 14 various species of bats in Illinois, the ones that most commonly move into your attic are Little Brown Bats and Big Brown Bats.

Since bats are not rodents, bat removal and exclusion may even be covered by your homeowner’s insurance policy.

Related: Bat species in Illinois


Are Bats Dangerous?

Bats are social, intelligent creatures. While they are extremely beneficial to insect control, they can be more than a nuisance when moving into your home.

Bats are not only carriers of rabies, a fatal disease, but a lesser-known danger is the health risk associated with bat excrement.

Exposure to bat droppings, or guano, may cause histoplasmosis. This disease primarily affects the lungs and if left untreated, can be fatal.


We are trained professionals and equipped to deal with bat exclusion and removal, including humane live animal trapping (never poisons!).

Attic Solutions - Call for Live Animal Removal, Dead Animal Removal, Attic RestorationFor professional bat removal services in Chicagoland call Attic Solutions (847) 464-1861

Attic Solutions can provide you with humane wild animal removal services in the Chicagoland suburbs. 

Satisfaction guaranteed!

Bat Hibernation Facts was last modified: January 17th, 2019 by Attic Solutions

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