Bats in New Hampshire: identification guide and where to start looking

1. What are the key identification markers for bats in New Hampshire?

Start with size and flight style. The little brown bat (Myotis lucifugus) is small, about 3-4 inches long with a wingspan of 8-10 inches, and flies in erratic, fluttery patterns. The big brown bat (Eptesicus fuscus) is larger, 4-5 inches long with a wingspan of 12-14 inches, and has steady, straight flight. Look at the face and ears: little browns have a smooth nose and ears that are not joined at the base; big browns have a broader nose and ears that are separated. The hoary bat is much larger with frosted fur and a wingspan of 16 inches, but it's less common. For more detail, check ourbat identification hub.

2. Where in New Hampshire are bats most commonly seen?

Most sightings happen near water, such as lakes, ponds, and slow-moving streams, where insects swarm. The Lakes Region and the Merrimack River valley are reliable spots. Bats also roost in old barns, attics, and bat houses. In summer, look under bridges at dusk, especially along Route 3 near Winnipesaukee. For state-specific locations, visit ourNew Hampshire wildlife page.

3. When is the best time of year for confident bat sightings?

Late May through early September is prime time. Bats are most active after sunset, usually within the first two hours. Warm, calm evenings with light wind give the best odds. June and July offer the longest evenings and highest insect activity. By October, most bats have migrated or entered hibernation. Winter sightings are rare except in caves or mines where they hibernate.

See ourstate animal guidefor the next step.

4. How can you tell bat species apart in the field?

Beyond size and flight, listen for echolocation calls with a bat detector. Little brown bats produce calls at 40-80 kHz, while big browns are louder and lower (20-50 kHz). Without a detector, focus on behavior: little browns often fly lower over water, while big browns forage higher in open spaces. The hoary bat's large size and white-tipped fur are distinctive if you get a good look. For help with lookalikes, see ourbat ID tips.

5. What should you do if you find a bat in your home?

Stay calm. If the bat is in a room, close the door and open a window to let it escape. Do not handle it with bare hands; use thick gloves or a container. If you suspect a bite or the bat is grounded, contact your local health department or wildlife rehabilitator. Bats are protected, so exclusion is best done in spring or fall after checking for young. More on bat conservation fromNew Hampshire Fish and Game.

6. Ready to show your bat appreciation?

If you enjoy spotting these nocturnal flyers, consider a subtle way to share your interest. Here are a few items for bat fans:

### Cute Bat Sticker

A simple sticker to add to your field notebook or water bottle. Great for ID reminders.Check Price and Availability

### Bat Animal Short-Sleeve T-Shirt

A comfortable tee featuring a bat graphic, perfect for casual wear or field trips.Check Price and Availability

### Baby Bat Cartoon T-Shirt

A playful cartoon bat tee that's soft and durable. Makes a nice gift for any bat fan.Check Price and Availability

Browse more bat-inspired gear at ourbat t-shirt collection.

7. What are the most common bat species in New Hampshire?

The little brown bat and big brown bat are the two you'll see most often. The hoary bat, eastern red bat, and silver-haired bat are also present but rarer. Indiana bats are endangered and rarely spotted. To confirm a species, note the size, flight pattern, and habitat. The little brown bat is the most widespread, but big browns are more common around buildings.

8. Are bats protected in New Hampshire?

Yes. All bats in New Hampshire are protected by state law. It is illegal to harm or kill them. Many species are also listed as endangered or threatened due to white-nose syndrome. If you need to remove bats from a structure, do so humanely with exclusion devices during appropriate seasons. Check withNew Hampshire Fish and Gamefor guidelines.

9. What is the best way to observe bats without disturbing them?

Find a spot near water at dusk and sit quietly. Use red light to avoid startling them. Avoid flash photography or loud noises. Binoculars with a wide field of view help. Never enter a cave or mine where bats hibernate, as that can cause fatal disturbance. Watching from a distance is the most respectful way to enjoy them.

See ourtour planning ideasfor the next step.