Bats in New Hampshire: Where to Look and What Signs to Watch For

Which bat species are most common in New Hampshire?

New Hampshire is home to eight bat species. The little brown bat and big brown bat are the ones you are most likely to see. The Indiana bat and northern long-eared bat are present but listed as endangered, so sightings are rare. Most bats you spot around houses or barns will be big brown bats.

Where in New Hampshire are you most likely to see bats?

Bats in New Hampshire prefer areas near water. The best places include the Lakes Region, the Merrimack River corridor, and the Connecticut River valley. In the White Mountains, bats roost in caves and under loose bark. For reliable evening viewing, try the boardwalks at the Great Bay National Wildlife Refuge or your own backyard if you have a pond.

What time of day and season should you look for bats?

Look at dusk, right after sunset. In New Hampshire, bat activity peaks between May and August. On warm summer evenings, bats emerge about 20-30 minutes after sunset. They are less active on cold or rainy nights. For more on seasonal patterns, visit our New Hampshire wildlife page.

See our state animal guide for the next step.

What field signs can help you identify bat activity?

Listen for high-pitched clicking sounds from bat detectors or their audible chirps near roosts. Look for dark, crumbly droppings (guano) under eaves, bridges, or barn rafters. At dusk, watch for erratic, swooping flight patterns over open water. These are your clearest clues that bats are feeding nearby. For more tips, see our bat identification guide.

How can you safely observe bats without disturbing them?

Never enter caves or mines where bats hibernate. Stay at least 30 feet away from known roosts. Use binoculars or a camera with a zoom lens. If you see a bat on the ground, leave it alone as it might be sick or injured. Report sightings to local wildlife authorities via our New Hampshire resources.