Bats in New Jersey: where to look and what signs to watch for

Where are bats most likely found in New Jersey?

Bats in New Jersey are most often seen near water sources like the Delaware River, the Pine Barrens, and large lakes. They also roost in old buildings, bridges, and hollow trees. Start with state parks such as Round Valley Recreation Area or the Great Swamp National Wildlife Refuge. Look along forest edges at dusk where insects swarm. For a broader view, see the New Jersey wildlife hub.

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

Bats are nocturnal, so your best window is the hour after sunset. They emerge to feed on insects. In New Jersey, the active season runs from April through October, with peak activity in July and August when insect populations are highest. On warm, calm evenings you can often see them foraging over open fields and water.

What field signs should a beginner look for?

The most obvious sign is bat guano, which looks like small dark pellets and often accumulates under roosts. Listen for chittering sounds at dusk near attics or eaves. Look for droppings on windowsills or porches. You may also see bats entering or exiting cracks in buildings or tree cavities just after sunset. Another clue is the presence of mosquito swarms bats are feeding on. Learn more about bat behavior on the bat species page.

See our state animal guide for the next step.

Which bat species are common in New Jersey?

New Jersey is home to nine bat species. The most widespread are the big brown bat and the little brown bat. You may also see the eastern red bat, hoary bat, and silver-haired bat. The Indiana bat, a federally endangered species, is found in some parts of the state. Each species has slightly different habitat preferences, but all are insectivores.

How can you identify bats in flight?

Watch for a bat's erratic, fluttering flight that changes direction quickly. Bats often swoop low over water or open ground. The big brown bat is larger with a wingspan up to 13 inches and flies in a straight, steady path. The little brown bat is smaller and more erratic. Eastern red bats have a reddish fur that can be seen if they fly near a light.