Bats in Minnesota: where to look and what signs to watch for

1. Where are bats most likely found in Minnesota?

Bats in Minnesota are most often seen near water sources like lakes, ponds, and rivers, where insects swarm. They also roost in older buildings, bridges, and hollow trees. The best known summer roosts are in state parks like Itasca State Park and along the Mississippi River valley. In winter, bats hibernate in caves and mines, mostly in the southeastern part of the state, but spotting them then is difficult. For more on their statewide distribution, see our main bat page.

In Minnesota, bats sightings usually improve when you slow down and match your first stop to where the animal is most likely in the state. Use the state wildlife hub and the route guide to 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.

2. What time of day and season is best for spotting bats?

Bats are nocturnal, so your best viewing window is dusk to early night, especially on warm evenings from May through August. They emerge from roosts shortly after sunset to feed on insects. Spring and fall migrations produce more bat activity but are less predictable. Winter spotting is rare unless you visit a hibernaculum, which is not recommended due to disturbance risks.

3. What field signs can help identify bat presence?

Look for guano (bat droppings) near roosts: small, dark, and crumbly, often accumulating on ledges or window sills. Also listen for squeaking or rustling from attics, barns, or bat houses at dusk. Stains from oils on fur can appear around entry holes. In flight, watch for erratic, fluttering patterns over water or open fields. These signs are reliable even if you don't see the bats themselves.

See our state animal guide for the next step.

4. Which bat species are common in Minnesota?

The little brown bat (Myotis lucifugus) and big brown bat (Eptesicus fuscus) are the species you are most likely to see. The northern long-eared bat (Myotis septentrionalis) is also present but less common. The hoary bat and eastern red bat are solitary tree-roosting species that migrate through Minnesota. For identification, note size: little brown bats are small (3-4 inches wingspan) while big brown bats are chunkier (12-14 inches wingspan).

5. How can I view bats safely without disturbing them?

Stay at least 50 feet from roosts and never enter known hibernation sites. Use a red flashlight to avoid disturbing their vision. If you have bats in a building, contact a licensed wildlife control professional for exclusion. Avoid handling bats; they can carry rabies. For more on responsible viewing, check our Minnesota wildlife page.