16 Types of Frogs in Pennsylvania
Pennsylvania is home to about 15 frog species. Most people encounter the Green Frog and the Gray Treefrog in ponds and forests. This guide covers the common types, their field marks, and the best spots and seasons to find them in the state.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 6, 2026.
Verified species, source iNaturalist
16 types of frogs recorded in Pennsylvania
16 frog species have a verified observation record in Pennsylvania, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
2 of the 16 shown are recorded as introduced to Pennsylvania rather than native.
1
2
3
4
5
6
7
8
9
10
11
12
Also recorded in Pennsylvania
| # | Species | Scientific name | Records |
|---|---|---|---|
| 13 | Cuban Tree FrogOsteopilus septentrionalis | Osteopilus septentrionalis | 19 |
| 14 | Mountain Chorus FrogNativePseudacris brachyphona | Pseudacris brachyphona | 16 |
| 15 | Eastern SpadefootNativeScaphiopus holbrookii | Scaphiopus holbrookii | 15 |
| 16 | Squirrel Tree FrogIntroducedDryophytes squirellus | Dryophytes squirellus | 12 |
Plus 7 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.
Pennsylvania is home to about 15 frog species. Most people encounter the Green Frog and the Gray Treefrog in ponds and forests. This guide covers the common types, their field marks, and the best spots and seasons to find them in the state.
What are the most common frogs in Pennsylvania?
The most widespread frogs in Pennsylvania are the Green Frog, Bullfrog, Gray Treefrog, and Spring Peeper. These four species account for the majority of sightings across the state. The Green Frog and Bullfrog are often confused, but the Green Frog has two distinct ridges down its back, while the Bullfrog lacks them. For a broader overview, check out ourfrog identification hub.
How can you identify frogs in Pennsylvania by their calls?
Each species has a distinct call that is reliable for identification. Spring Peepers produce a high-pitched whistle, while Gray Treefrogs give a short trill. Bullfrogs make a deep 'jug-o-rum' call, and Green Frogs sound like a loose banjo string. The best time to hear them is just after sunset in spring. Learning these calls greatly improves your odds of correct identification.
Where in Pennsylvania can you find the most frog diversity?
The Pine Barrens region in southern New Jersey extends into southeastern Pennsylvania and holds rare species like the Pine Barrens Treefrog. The Pocono Mountains and the Allegheny National Forest offer excellent frog habitat with many ponds and streams. For a state-level view, visit ourPennsylvania wildlife pagefor specific hotspots.
See ourstate animal guidefor the next step.
When is the best season to hear and see frogs in Pennsylvania?
Spring is the peak season for frog activity, from March through June. Most species breed in temporary ponds (vernal pools) right after the ice melts. Warm, rainy nights in April are especially productive. Summer is good for finding Green Frogs and Bullfrogs along permanent water bodies. Fall activity declines sharply as frogs prepare to hibernate.
What are the key field marks to separate lookalike frogs?
The Bullfrog and Green Frog are often mistaken. Look for dorsal ridges: Green Frogs have two prominent ridges running from behind the eye down the back; Bullfrogs lack these. Also note the belly color: Green Frogs have a greenish yellow belly, while Bullfrogs have a white belly with dark mottling. Another common pair is the Gray Treefrog and Cope's Gray Treefrog, which are best separated by call or chromosome count. For more on similar species, see ourheron guideas herons prey on these frogs and often highlight their locations.
Which frogs in Pennsylvania are rare or protected?
The Pine Barrens Treefrog is Pennsylvania's only endangered frog, found only in the southeastern corner. The Eastern Spadefoot Toad is also rare and listed as a species of special concern. These two are seldom encountered, so if you see one, note the location and report it to the Pennsylvania Herpetological Atlas. For more state-specific resources, return to ourPennsylvania wildlife hub.
Frog art and prints for your wall
After spotting frogs in the field, bring their beauty indoors with these art prints.
Red Eyed Tree Frog Limited-Edition Print
A vivid illustration capturing the iconic red-eyed tree frog. Perfect for adding a pop of color to any room.Check Price and Availability
Pine Barrens Tree Frog Limited-Edition Print
Celebrate Pennsylvania's rarest frog with this limited edition print. A must-have for herpetology enthusiasts.Check Price and Availability
iCanvas Frog Green Wall Art by Jo Lynch
A modern green frog print that fits well in a nature-themed decor. Canvas wrapped and ready to hang.Check Price and Availability
For more wildlife-themed apparel and art, browse ourt-shirt collectionto compare designs.
Wall art print: Frog by Eimear Maguire on Artfully Walls. Illustration, Animals, framed or unframed art printed on fine art paper
Product from otherCheck Price and Availability
Frequently asked questions about frogs in Pennsylvania
**What is the smallest frog in Pennsylvania?** The Spring Peeper, which grows to about 1.5 inches (3.8 cm). Its high-pitched call is a classic sign of spring.
**Are there poisonous frogs in Pennsylvania?** No native frogs are dangerously poisonous. The Gray Treefrog secretes a mild irritant that can sting if it gets in your eyes, but it is not harmful.
**What is the largest frog in Pennsylvania?** The Bullfrog can reach up to 8 inches (20 cm) and weigh over a pound. It is an invasive species in some areas and competes with native frogs.
**How can I attract frogs to my backyard pond?** Provide shallow, unpolluted water with plenty of aquatic plants. Avoid using pesticides and keep a section of the pond shaded. Native frogs like Green Frogs and Gray Treefrogs may move in naturally.
See ourtour planning ideasfor the next step.
Gear and field guides
Frequently asked questions
What are the most common frogs in Pennsylvania?+
The most widespread frogs in Pennsylvania are the Green Frog, Bullfrog, Gray Treefrog, and Spring Peeper. These four species account for the majority of sightings across the state. The Green Frog and Bullfrog are often confused, but the Green Frog has two distinct ridges down its back, while the Bullfrog lacks them. For a broader overview, check out ourfrog identification hub.
How can you identify frogs in Pennsylvania by their calls?+
Each species has a distinct call that is reliable for identification. Spring Peepers produce a high-pitched whistle, while Gray Treefrogs give a short trill. Bullfrogs make a deep 'jug-o-rum' call, and Green Frogs sound like a loose banjo string. The best time to hear them is just after sunset in spring. Learning these calls greatly improves your odds of correct identification.
Where in Pennsylvania can you find the most frog diversity?+
The Pine Barrens region in southern New Jersey extends into southeastern Pennsylvania and holds rare species like the Pine Barrens Treefrog. The Pocono Mountains and the Allegheny National Forest offer excellent frog habitat with many ponds and streams. For a state-level view, visit ourPennsylvania wildlife pagefor specific hotspots. See ourstate animal guidefor the next step.
When is the best season to hear and see frogs in Pennsylvania?+
Spring is the peak season for frog activity, from March through June. Most species breed in temporary ponds (vernal pools) right after the ice melts. Warm, rainy nights in April are especially productive. Summer is good for finding Green Frogs and Bullfrogs along permanent water bodies. Fall activity declines sharply as frogs prepare to hibernate.
What are the key field marks to separate lookalike frogs?+
The Bullfrog and Green Frog are often mistaken. Look for dorsal ridges: Green Frogs have two prominent ridges running from behind the eye down the back; Bullfrogs lack these. Also note the belly color: Green Frogs have a greenish yellow belly, while Bullfrogs have a white belly with dark mottling. Another common pair is the Gray Treefrog and Cope's Gray Treefrog, which are best separated by call or chromosome count. For more on similar species, see ourheron guideas herons prey on these frogs and often highlight their locations.
Which frogs in Pennsylvania are rare or protected?+
The Pine Barrens Treefrog is Pennsylvania's only endangered frog, found only in the southeastern corner. The Eastern Spadefoot Toad is also rare and listed as a species of special concern. These two are seldom encountered, so if you see one, note the location and report it to the Pennsylvania Herpetological Atlas. For more state-specific resources, return to ourPennsylvania wildlife hub.
Keep exploring
More wildlife in Pennsylvania