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

1. Where are bats most likely found in Pennsylvania?

Bats in Pennsylvania are most common in the central and northern parts of the state, where large tracts of forest provide roosting and foraging habitat. Look for them near lakes, rivers, and wetlands, especially around old-growth forests. Bridges, barns, and abandoned mines serve as popular roosts during the day. Start at state parks like Rickets Glen or Pine Creek Gorge.

See our state wildlife page for the next step.

2. When is the best time of day or year to see bats?

Bats are nocturnal, so your best viewing window is from about 30 minutes before sunset to an hour after dark. Spring through early fall is prime time, with June to August being peak activity for most species. In winter, many bats hibernate in caves or mines, so sightings are rare unless you visit known hibernacula.

See our Bats guide for the next step.

3. What signs indicate bat activity?

The most obvious sign is seeing bats themselves at dusk, but you can also look for guano (droppings) under roosts, which resembles crumbly black pellets. Listen for high-pitched squeaks and rustling noises from roosts. Stains on building walls or bridges from their oily fur are another clue. Moth and beetle activity near lights often attracts bats too.

See our state animal guide for the next step.

4. How can you distinguish bats from birds or other flying animals?

Bats have a distinctive erratic, fluttering flight pattern, unlike the steady wing beats of birds. They also appear to be somewhat jerky and may dive suddenly after insects. Their wings are membranous and lack feathers, so if you get a close look, you'll see the skin. At dusk, use a pair of binoculars to spot the wing shape: bats have long, slender wings that curve back.

5. What common bat species might you see in Pennsylvania?

The big brown bat is the most widespread, often seen hunting over meadows. Little brown bats (though declining due to white-nose syndrome) still occur in some areas. Other species include the eastern red bat, hoary bat, and northern long-eared bat. Each has slightly different habits: red bats roost in trees, while big brown bats often use buildings. Check the bat animal hub for more details.