2 Types of Bats in New Hampshire
Yes, bats are common across New Hampshire, especially in summer. The best place to start is your local pond or forest edge at dusk. New Hampshire hosts at least 8 species, from the tiny little brown bat to the much larger hoary bat. Learn to identify the most likely species, understand what makes each one unique, and know when and where to look for them with this practical field guide.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 27, 2026.
- 8
- species recorded
- August, July, September
- peak months
Verified species, source iNaturalist
2 types of bats recorded in New Hampshire
2 bat species have a verified observation record in New Hampshire across bats (order Chiroptera), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
1
2
Plus 6 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations. Photos by iNaturalist observers, reused under the licence each observer chose.
Real sighting data, source iNaturalist
221 verified observations on iNaturalist of bat have been recorded in New Hampshire, most often in August, July, September.
When bat are recorded in New Hampshire
Yes, bats are common across New Hampshire, especially in summer. The best place to start is your local pond or forest edge at dusk. New Hampshire hosts at least 8 species, from the tiny little brown bat to the much larger hoary bat. Learn to identify the most likely species, understand what makes each one unique, and know when and where to look for them with this practical field guide.
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. Coastal wetlands in Hampton and Portsmouth attract several migratory species in May and August. White Mountain National Forest has excellent habitat for hoary and silver-haired bats during their migration periods. 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. Silver-haired bats have dark fur with white tips and medium size. Indiana bats are rare, small, and darker than little browns. 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 will 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.
10. Which species are year-round residents versus migrants in New Hampshire?
Little brown bats and big brown bats are year-round residents and hibernate locally in caves, mines, and building cavities. Hoary bats and silver-haired bats are spring and fall migrants, passing through New Hampshire on their way to and from southern breeding grounds. The eastern red bat is a migratory tree-roosting species that may be present in summer and during migration windows. Indiana bats hibernate locally but undertake some seasonal movements within the Northeast. Understanding these patterns helps predict where and when you will encounter each species.
11. What ecological role do bats play in New Hampshire's ecosystem?
Bats are voracious insect predators. A single little brown bat can eat up to 1,000 insects per night, including many pest species like mosquitoes and agricultural pests. A colony of big brown bats in a barn can consume tons of insects across a summer season, providing natural pest control without pesticides. This predation pressure helps regulate insect populations and maintains ecosystem balance. Many plants that flower at night depend on bats for pollination, and bats also disperse seeds through their droppings, making them critical for forest health.
12. What does white-nose syndrome mean for bats in New Hampshire?
White-nose syndrome is a fungal disease that affects hibernating bats, particularly little brown bats and Indiana bats. The fungus grows on the muzzle, ears, and wings during hibernation, causing bats to wake more frequently and burn energy reserves. Many infected bats do not survive the winter. In New Hampshire, the disease first appeared in 2009 and has since decimated local bat populations, making some species harder to encounter than they were a decade ago. Conservation efforts focus on cave protection and minimizing disturbance during hibernation to give bats the best chance of survival.
Gear and field guides
Frequently asked questions
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. Coastal wetlands in Hampton and Portsmouth attract several migratory species in May and August. White Mountain National Forest has excellent habitat for hoary and silver-haired bats during their migration periods. 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. Silver-haired bats have dark fur with white tips and medium size. Indiana bats are rare, small, and darker than little browns. 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 will 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.
10. Which species are year-round residents versus migrants in New Hampshire?+
Little brown bats and big brown bats are year-round residents and hibernate locally in caves, mines, and building cavities. Hoary bats and silver-haired bats are spring and fall migrants, passing through New Hampshire on their way to and from southern breeding grounds. The eastern red bat is a migratory tree-roosting species that may be present in summer and during migration windows. Indiana bats hibernate locally but undertake some seasonal movements within the Northeast. Understanding these patterns helps predict where and when you will encounter each species.
11. What ecological role do bats play in New Hampshire's ecosystem?+
Bats are voracious insect predators. A single little brown bat can eat up to 1,000 insects per night, including many pest species like mosquitoes and agricultural pests. A colony of big brown bats in a barn can consume tons of insects across a summer season, providing natural pest control without pesticides. This predation pressure helps regulate insect populations and maintains ecosystem balance. Many plants that flower at night depend on bats for pollination, and bats also disperse seeds through their droppings, making them critical for forest health.
12. What does white-nose syndrome mean for bats in New Hampshire?+
White-nose syndrome is a fungal disease that affects hibernating bats, particularly little brown bats and Indiana bats. The fungus grows on the muzzle, ears, and wings during hibernation, causing bats to wake more frequently and burn energy reserves. Many infected bats do not survive the winter. In New Hampshire, the disease first appeared in 2009 and has since decimated local bat populations, making some species harder to encounter than they were a decade ago. Conservation efforts focus on cave protection and minimizing disturbance during hibernation to give bats the best chance of survival.
Keep exploring
More places to see bat
More wildlife in New Hampshire