10 Types of Frogs Found in Pennsylvania! (ID Guide) (2024)

“What kind of frogs can you find in Pennsylvania?”

I love finding, observing, and hearing frogs!

Even as a kid, I used to patrol the swamps by my house, catching them and then trying to sell them as pets to cars passing by. As you can imagine, no one was interested in buying my frogs, and I ended up letting them go at the end of each day. 🙂

Today, I’m providing a guide to teach you about the different kinds of frogs found in Pennsylvania.

One of the BEST ways to find frogs is to learn the noises they make. So, in addition to pictures, you will find audio samples for each species below!

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#1. American Bullfrog

• Lithobates catesbeianus

Identifying Characteristics:

• Adult body lengths range from 3.6 to 6 inches.
• Coloration is typically olive green, with some individuals having gray or brown mottling or spots.
• Fully webbed back feet.

The American Bullfrog is the largest frog in Pennsylvania!

Believe it or not, they can grow to weigh as much as 1.5 pounds (.7 kg).

American Bullfrog Range Map

Green = native range. Red = introduced range.

Bullfrogs can be found in permanent bodies of water, including swamps, ponds, and lakes. During the breeding season, the male frogs select egg sites in shallow waters, which they defend aggressively. A female will then select a male by entering his territory.

They are named for their deep call, which is thought to sound like a bull bellowing.

Bullfrogs are known to eat just about anything they can fit in their mouth and swallow! The list of prey includes other frogs, fish, turtles, small birds, bats, rodents, insects, crustaceans, and worms. I have personally witnessed one even trying to eat a baby duck!

#2. Northern Leopard Frog

• Lithobates pipiens

Identifying Characteristics:

• Adults range from 2 to 4.5 inches long.
• Smooth skin is green, brown, or yellow-green with large dark spots.
• Lighter-colored raised ridges extend down the length of the back.

You can spot Northern Leopard Frogs in Pennsylvania near slow-moving bodies of water with lots of vegetation. You might see them in or near ponds, lakes, streams, and marshes. I love how bright green most individuals appear!

Northern Leopard Frog Range Map

Due to their fairly large size, these frogs eat various foods, including worms, crickets, flies, and small frogs, snakes, and birds. In one study, a bat was even observed being eaten!

During the spring breeding season, the males will float in shallow pools emitting a low call thought to sound a bit like snoring. The Northern Leopard Frog may also make a high, loud, screaming call if captured or startled.

Northern Leopard Frog populations are declining in many areas, and the cause is not exactly known. It’s thought to be some combination of habitat loss, drought, introduced fish, environmental contaminants, and disease.

#3. Green Frog

• Lithobates clamitans

Identifying Characteristics:

• Adult body lengths range from 2 to 4 inches, and the females are typically larger than males.
• Coloration is normally green or brown with darker mottling or spots on the back.
• Ridges run down the sides of the back and they have webbed hind feet.

Green Frogs are one of the easiest frogs to find in Pennsylvania.

Green Frog Range Map

Look for them in permanent bodies of water, including lakes, ponds, swamps, and streams. They spend most of their time near the shoreline but jump into deeper water when approached. They also breed and lay eggs near the shore, typically in areas with aquatic vegetation.

The Green Frog produces a single note call that is relatively easy to identify. Listen for a noise that sounds like a plucked banjo string, which is often repeated.

To hunt, they use a “sit and wait” approach, so they are fairly opportunistic. Green Frogs will try to eat almost anything they can fit inside their mouth. The list includes spiders, insects, fish, crayfish, snails, slugs, small snakes, and even other frogs!

#4. Spring Peeper

• Pseudacris crucifer

Identifying Characteristics:

• Adults are small and range from 1 to 1.5 inches long.
• They’re typically tan or brown, with the females being lighter in color.
• Both males and females usually feature a darker cross or ‘X’ on their back.

These tiny frogs can be found all over Pennsylvania.

You’ll typically spot Spring Peepers on the forest floor among the leaves. However, they do have large toe pads that they use for climbing trees.

Spring Peeper Range Map

You can find them in ponds and small bodies of water in the spring, where they breed and lay eggs. After hatching, the young frogs remain in the tadpole stage for about three months before leaving the water.

Spring Peepers get their name from their distinctive spring chorus. They’re thought to sound a bit like baby chickens’ peeps, and they are most often heard in early spring! LISTEN BELOW!

Their calls are very distinctive, and once you know what to listen for, these frogs are very easy to identify by sound.

#5. Gray Treefrog

• Dryophytes versicolor

Identifying Characteristics:

• Adult body lengths range from 1.5 to 2 inches.
• Mottled gray, green, and brown coloring. Look for a whitish spot beneath each eye.
• Bumpy skin, short snouts, and bright orange on the undersides of their legs.

Chameleons aren’t the only animal that can change colors! This incredible frog can slowly change colors to match what it’s sitting on to camouflage itself. They can vary from gray to green or brown. It’s common for their back to display a mottled coloring, much like lichen.

Gray Treefrogs are ubiquitous throughout Pennsylvania. You’ll spot them in a wide variety of wooded habitats, from backyards to forests to swamps.

Gray Treefrog Range Map

They stick to the treetops until it’s time to breed. Gray Treefrogs prefer to mate and lay eggs in woodland ponds without fish. They’ll also use swamps and garden water features.

Gray Treefrogs are easier to hear than to see.

Listen for a high trill that lasts about 1 second, which is commonly heard in spring and summer.

*Gray Treefrogs are essentially identical to Cope’s Gray Treefrogs. The only way to tell the difference is to listen to their breeding calls. You can learn more by visiting this site.*

#6. Pickerel Frog

• Lithobates palustris

Identifying Characteristics:

• Adult body length ranges from 2 to 4 inches.
• Dark green-brown coloration with two rows of dark squarish spots running down its back. Bright yellow color on the underside of hind legs.
• Females are typically darker and larger than males.

Pickerel Frogs prefer cool, clear waters in Pennsylvania. You can find them in ponds, rivers, lakes, slow-moving streams, and even ditches.

Pickerel Frog Range Map

During the breeding season, the males attract females with a low, snore-like call. The females will attach egg masses to branches in cool water, where the tadpoles will spend 87-95 days before becoming frogs.

Pickerel Frogs are the ONLY poisonous frog native to Pennsylvania.

When attacked, they produce toxic skin irritations that can be fatal to other animals and may cause skin irritation in humans if handled. As you can imagine, most predators leave them alone!

#7. Wood Frog

• Lithobates sylvaticus

Identifying Characteristics:

• Adult body lengths range from 1.5 to 3.25 inches.
• Coloration is various shades of brown, gray, red, or green, with females tending to be more brightly colored.
• Distinct black marking across the eyes, which resembles a mask.

As the name suggests, Wood Frogs are found in Pennsylvania in moist woodland habitats, including forested swamps, ravines, and bogs. They travel widely and visit seasonal pools to breed.

Wood Frog Range Map

This incredible little frog has a wide range across North America. They have adapted to cold climates by being able to freeze over the winter. Their breathing and heartbeat stop, and their bodies produce a type of antifreeze that prevents their cells from bursting. In the spring, they thaw and begin feeding again.

Interestingly, Wood Frogs seem to be able to recognize their family. Scientists have found that as tadpoles, siblings will seek each other out and group together!

Wood Frogs are one of the first amphibians to emerge after the snow melts.

Listen for a call that sounds a bit like a clucking chicken near vernal pools and other small bodies of water!

#8. Western Chorus Frog

• Pseudacris triseriata

Identifying Characteristics:

• Adult body length up to 1.6 inches long.
• Smooth skin with color that varies from gray to green or brown.
• Dark brown or gray stripes that run down the back, dark stripe from the snout through the eye, and white stripe on the upper lip.
• Also called the Midland Chorus Frog.

In Pennsylvania, look for the Western Chorus Frog in woodland ponds, marshes, swamps, meadows, and grassy pools.

Western Chorus Frog Range Map

Credit: U.S. Geological Survey, Department of the Interior/USGS

For breeding, they try to find bodies of water without fish, including flooded fields, beaver ponds, roadside ditches, marshes, and shallow lakes and ponds. The female attaches small masses of eggs to underwater vegetation.

Western Chorus Frogs are secretive and nocturnal, so they can be hard to spot. Your best way to locate one is to use your ears.

Listen for a unique call that is rapid and relatively short and sounds a bit like running your finger over the teeth of a comb.

#9. Northern Cricket Frog

• Acris crepitans

Identifying Characteristics:

• Adults from 0.75 to 1.5 inches long.
• Irregular color patterns including grays, greens, browns, yellows, and blacks.
• A dark triangular spot between the eyes, blunt snout, warts, and dark banding on the legs.

This frog is one of the smallest vertebrates found in Pennsylvania!

But even though they are tiny, they can jump over 3 FEET in a single jump to escape predators, in addition to being excellent swimmers.

Northern Cricket Frog Range Map

Although Northern Cricket Frogs are part of the treefrog family, they don’t spend much time in trees. Typically you can find them in ponds and lakes with plentiful vegetation as well as slow-moving rivers.

This frog gets its name from its unique call. As you can probably guess, the Northern Cricket Frog makes a breeding call that sounds like the repeating chirp of a cricket.

#10. Upland Chorus Frog

• Pseudacris feriarum

Identifying Characteristics:

• They are different shades of brown with darker blotching on the body.
• Small frogs that grow between 0.75–1.5 inches (1.9–3.8 cm) in length.
• Look for a white line above the upper lip.

Due to their nocturnal and secretive nature, Upland Chorus Frogs are RARELY seen in Pennsylvania.

The best chance you have to find one is at night, immediately after it rains.

In addition, you won’t find Upland Chorus Frogs in water, as they are terrestrial. They live in a variety of different habitats as long as it’s relatively moist, provides ample vegetation for hiding places, and is near a permanent source of water.

Unlike most other frog species, it is also fairly hard to HEAR one. But if you are lucky and are in the right place at the right time, it would sound like this:

Do you need additional help identifying frogs?

Try this field guide!

• Peterson Field Guides to Reptiles and Amphibians

Which of these frogs have you seen in Pennsylvania?

Leave a comment below!