6 Types of Bats in Wisconsin
Yes, Wisconsin hosts several bat species, most notably the little brown bat and big brown bat. Start your search near water bodies and forest edges at dusk from late spring through early fall. This guide covers key ID markers, common lookalikes, and the best spots for confident sightings.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 6, 2026.
Verified species, source iNaturalist
6 types of bats recorded in Wisconsin
6 bat species have a verified observation record in Wisconsin across bats (order Chiroptera), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
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Plus 1 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations. Photos by iNaturalist observers, reused under the licence each observer chose.
Yes, Wisconsin hosts several bat species, most notably the little brown bat and big brown bat. Start your search near water bodies and forest edges at dusk from late spring through early fall. This guide covers key ID markers, common lookalikes, and the best spots for confident sightings.
What are the most useful ID markers for bats in Wisconsin?
Focus on body size, ear shape, and fur color. Little brown bats have glossy brown fur and small ears, while big brown bats are larger with a more useful body. Hoary bats have frosted fur and are larger, often mistaken for birds in flight. Look for the length of the tail membrane and the shape of the tragus (the inner ear flap) for finer separation. Use a good flashlight or watch them against a light sky.
See ourstate wildlife pagefor the next step.
In Wisconsin, bats sightings usually improve when you slow down and match your first stop to the most useful ID markers and likely lookalikes. Use thestate wildlife huband theroute guideto narrow your first area, then check access, weather, and distance before you settle in. A short walk with one clear viewing plan often beats covering too much ground, especially when habitat changes fast from open edges to brush, wetlands, timber, shoreline, or neighborhood cover.
Where in Wisconsin do people usually first notice bats?
Most first sightings happen around water: lakes, rivers, and ponds where bats hunt insects at dusk. State parks like Devil's Lake State Park and Kettle Moraine State Forest are reliable. Also check barns, old buildings, and forest edges near your property. In urban areas, watch for bats near streetlights or over rivers like the Wisconsin River.
What is the best season for sighting bats in Wisconsin?
Prime bat season runs from mid-May through September. Bats emerge from hibernation in April, but evening activity peaks in summer when insects are abundant. Warm, calm evenings are best; cool or windy nights reduce activity. By October, most bats have migrated or entered hibernation.
See ourstate animal guidefor the next step.
What are the common bat species in Wisconsin?
Wisconsin hosts eight bat species. The most widespread are the little brown bat (Myotis lucifugus) and big brown bat (Eptesicus fuscus). Others include the hoary bat, eastern red bat, silver-haired bat, and northern long-eared bat. The Indiana bat and evening bat are rarer. Hoary and red bats are tree-roosting and often migrated through in fall.
How can you tell bats apart from lookalike birds?
Bats have a distinctive fluttering, erratic flight pattern, unlike the steady wingbeats of swifts or nighthawks. At dusk, look for the lack of a tail fork and the presence of ears. Nighthawks have white wing patches and a longer wingspan. Swifts are smaller and more uniformly dark. Bats also glide and flap in an alternating pattern.
What should you do if you find a bat in your house?
Stay calm. Open windows and doors to let it fly out. Turn off lights to reduce confusion. If it doesn't leave, call a local wildlife rehabilitator. Never handle a bat with bare hands, as they can carry rabies. For identification, take a photo from a safe distance and compare with field guides or check /animals/bat for details.
What gear helps with bat watching?
A good pair of binoculars with low light performance and a red flashlight help observe without disturbing bats. Consider a portable bat detector to hear echolocation calls. After your outing, check out theCute Bat Stickerfor a fun souvenir.
See ourCompare wildlife shirtsfor the next step.
Bat Animal Short-Sleeve T-Shirt
A strong match for this wildlife page and an easy next click after the guide.Check Price and Availability
Baby Bat Cartoon T-Shirt
You can't go wrong with this Baby Bat, Cute Animal Cartoon Tee Women's -Image by Shutterstock that gives you an authentic style everyday. This T-shirt has been made for your everyday superior comfort. This T-shirt also makes an amazing giftCheck Price and Availability
Frequently Asked Questions about Bat ID in Wisconsin
**Q: Are there endangered bats in Wisconsin?**\nA: Yes, the Indiana bat is federally endangered and rarely seen. If you suspect one, report it to the Wisconsin DNR.\n\n**Q: Can bats be seen during the day?**\nA: Rarely; daytime sightings usually indicate a sick or disturbed bat. Most are nocturnal.\n\n**Q: How do I attract bats to my yard?**\nA: Put up a bat house in a sunny spot near water and avoid pesticides. For more tips, visitbat conservation resources.\n\n**Q: What is the largest bat in Wisconsin?**\nA: The hoary bat, with a wingspan up to 16 inches. It's a migratory species seen in late summer.
See ourtour planning ideasfor the next step.
Gear and field guides
Frequently asked questions
What are the most useful ID markers for bats in Wisconsin?+
Focus on body size, ear shape, and fur color. Little brown bats have glossy brown fur and small ears, while big brown bats are larger with a more useful body. Hoary bats have frosted fur and are larger, often mistaken for birds in flight. Look for the length of the tail membrane and the shape of the tragus (the inner ear flap) for finer separation. Use a good flashlight or watch them against a light sky. See ourstate wildlife pagefor the next step. In Wisconsin, bats sightings usually improve when you slow down and match your first stop to the most useful ID markers and likely lookalikes. Use thestate wildlife huband theroute guideto narrow your first area, then check access, weather, and distance before you settle in. A short walk with one clear viewing plan often beats covering too much ground, especially when habitat changes fast from open edges to brush, wetlands, timber, shoreline, or neighborhood cover.
Where in Wisconsin do people usually first notice bats?+
Most first sightings happen around water: lakes, rivers, and ponds where bats hunt insects at dusk. State parks like Devil's Lake State Park and Kettle Moraine State Forest are reliable. Also check barns, old buildings, and forest edges near your property. In urban areas, watch for bats near streetlights or over rivers like the Wisconsin River.
What is the best season for sighting bats in Wisconsin?+
Prime bat season runs from mid-May through September. Bats emerge from hibernation in April, but evening activity peaks in summer when insects are abundant. Warm, calm evenings are best; cool or windy nights reduce activity. By October, most bats have migrated or entered hibernation. See ourstate animal guidefor the next step.
What are the common bat species in Wisconsin?+
Wisconsin hosts eight bat species. The most widespread are the little brown bat (Myotis lucifugus) and big brown bat (Eptesicus fuscus). Others include the hoary bat, eastern red bat, silver-haired bat, and northern long-eared bat. The Indiana bat and evening bat are rarer. Hoary and red bats are tree-roosting and often migrated through in fall.
How can you tell bats apart from lookalike birds?+
Bats have a distinctive fluttering, erratic flight pattern, unlike the steady wingbeats of swifts or nighthawks. At dusk, look for the lack of a tail fork and the presence of ears. Nighthawks have white wing patches and a longer wingspan. Swifts are smaller and more uniformly dark. Bats also glide and flap in an alternating pattern.
What should you do if you find a bat in your house?+
Stay calm. Open windows and doors to let it fly out. Turn off lights to reduce confusion. If it doesn't leave, call a local wildlife rehabilitator. Never handle a bat with bare hands, as they can carry rabies. For identification, take a photo from a safe distance and compare with field guides or check /animals/bat for details.
What gear helps with bat watching?+
A good pair of binoculars with low light performance and a red flashlight help observe without disturbing bats. Consider a portable bat detector to hear echolocation calls. After your outing, check out theCute Bat Stickerfor a fun souvenir. See ourCompare wildlife shirtsfor the next step. ### Bat Animal Short-Sleeve T-Shirt A strong match for this wildlife page and an easy next click after the guide.Check Price and Availability ### Baby Bat Cartoon T-Shirt You can't go wrong with this Baby Bat, Cute Animal Cartoon Tee Women's -Image by Shutterstock that gives you an authentic style everyday. This T-shirt has been made for your everyday superior comfort. This T-shirt also makes an amazing giftCheck Price and Availability
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