7 Types of Tree Frogs in Pennsylvania
Pennsylvania is home to several tree frog species, most notably the gray tree frog and the spring peeper. These small, arboreal amphibians are easiest to identify by their distinctive calls and toe pads. For confident sightings, focus on wooded wetlands from April through September, especially after warm rains.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 6, 2026.
- 8
- species recorded
- May, March, April
- peak months
Verified species, source iNaturalist
7 types of tree frogs recorded in Pennsylvania
7 tree 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 7 shown are recorded as introduced to Pennsylvania rather than native.
1
2
3
4
5
6
7
Plus 4 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
5,657 verified observations on iNaturalist of tree frog have been recorded in Pennsylvania, most often in May, March, April.
When tree frog are recorded in Pennsylvania
Pennsylvania is home to several tree frog species, most notably the gray tree frog and the spring peeper. These small, arboreal amphibians are easiest to identify by their distinctive calls and toe pads. For confident sightings, focus on wooded wetlands from April through September, especially after warm rains.
1. What tree frog species live in Pennsylvania?
The most common tree frogs in Pennsylvania are the gray tree frog (Hyla versicolor) and the spring peeper (Pseudacris crucifer). You might also encounter the Cope's gray tree frog (Hyla chrysoscelis), which looks nearly identical to the gray tree frog but has a faster trill. The boreal chorus frog (Pseudacris maculata) is less common and found mainly in the northwestern part of the state. All are small, with gray tree frogs reaching about 1.5 inches and spring peepers barely an inch.
2. How can you tell gray tree frogs apart from spring peepers?
Gray tree frogs are chunkier, with warty skin and large toe pads. They can change color from gray to green to brown. Spring peepers are smoother, smaller, and have a dark X-shaped marking on their back. Their calls are also distinct: gray tree frogs produce a short, musical trill, while spring peepers give a high-pitched, ascending whistle. Both are most active after rain.
3. Where in Pennsylvania are tree frogs most often seen?
Your best odds are near wooded wetlands, ponds, and slow-moving streams across the state. The Poconos and the Allegheny Plateau are excellent starting points. Look in shrubs and low tree branches close to water. In summer, you might find gray tree frogs on porch lights or windows at night, hunting insects. For more tips, check out ourPennsylvania wildlife page.
See ourstate animal guidefor the next step.
4. What time of year is best for spotting tree frogs in Pennsylvania?
Tree frogs are most active from April through September. Breeding season peaks from April to June, when males call loudly at night. Warm, humid evenings after light rain offer the best odds. During dry spells, they retreat to trees and become harder to find. Spring peepers are among the first frogs to call in early spring, often while ice is still on the edges of ponds.
5. How do you identify a tree frog by its call?
The spring peeper's call is a single, clear whistle repeated about once per second. Gray tree frogs produce a short, melodic trill lasting 1-2 seconds. Cope's gray tree frog has a faster, harsher trill. To hear examples, visit thetree frog species hubwhere we have call recordings. Practice at dusk near breeding ponds.
6. What lookalike species might cause confusion?
Chorus frogs and cricket frogs are often mistaken for tree frogs. Chorus frogs have a dark stripe through the eye, while tree frogs have a distinct dark line from the snout through the eye. Cricket frogs are smaller, with bumpy skin and no toe pads. True tree frogs have enlarged toe pads for climbing. Boreal chorus frogs are rare in Pennsylvania but can be confused with spring peepers; look for three dark stripes down the back.
7. Show your tree frog pride
After a successful ID session, why not wear your find? Easy Street Markets has a selection of tree frog shirts that make great conversation starters.
Amazon Rainforest Upper Orinoco Tree Frog Sweatshirt
This sweatshirt features a colorful Amazonian tree frog design, perfect for cool evenings in the field.Check Price and Availability
Tree Frog T-Shirt
A simple, clean tee with a tree frog graphic, ideal for casual outings.Check Price and Availability
Vintage Tree Frog T-Shirt
This retro-style tee gives a nod to classic wildlife art.Check Price and Availability
Browse more options on ourtree frog t-shirts page.
8. Travel widget: Plan your Pennsylvania tree frog search
Use this tool to find hotels, rentals, and other travel options near top frog habitats in Pennsylvania.
9. Frequently asked questions about tree frogs in Pennsylvania
**Q: Are tree frogs poisonous in Pennsylvania?** A: Gray tree frogs secrete a mild skin toxin that can irritate eyes or mouth, but they are not dangerous to humans. Wash your hands after handling.
**Q: Can you keep a Pennsylvania tree frog as a pet?** A: It's legal to keep native tree frogs, but they require specific humidity and temperature. Check local regulations. It's often better to observe them in the wild.
**Q: What is the easiest tree frog to find in Pennsylvania?** A: The spring peeper is widespread and its loud call makes it easy to locate. Gray tree frogs are also common but more cryptic.
**Q: Do tree frogs hibernate in Pennsylvania?** A: Yes, they hibernate under leaf litter, logs, or in tree crevices from October to March.
**Q: How can I attract tree frogs to my yard?** A: Provide a small pond without fish, native shrubs, and leave leaf litter. Avoid pesticides. Turn off outdoor lights at night so they can hunt naturally.
See ourtour planning ideasfor the next step.
Frequently asked questions
1. What tree frog species live in Pennsylvania?+
The most common tree frogs in Pennsylvania are the gray tree frog (Hyla versicolor) and the spring peeper (Pseudacris crucifer). You might also encounter the Cope's gray tree frog (Hyla chrysoscelis), which looks nearly identical to the gray tree frog but has a faster trill. The boreal chorus frog (Pseudacris maculata) is less common and found mainly in the northwestern part of the state. All are small, with gray tree frogs reaching about 1.5 inches and spring peepers barely an inch.
2. How can you tell gray tree frogs apart from spring peepers?+
Gray tree frogs are chunkier, with warty skin and large toe pads. They can change color from gray to green to brown. Spring peepers are smoother, smaller, and have a dark X-shaped marking on their back. Their calls are also distinct: gray tree frogs produce a short, musical trill, while spring peepers give a high-pitched, ascending whistle. Both are most active after rain.
3. Where in Pennsylvania are tree frogs most often seen?+
Your best odds are near wooded wetlands, ponds, and slow-moving streams across the state. The Poconos and the Allegheny Plateau are excellent starting points. Look in shrubs and low tree branches close to water. In summer, you might find gray tree frogs on porch lights or windows at night, hunting insects. For more tips, check out ourPennsylvania wildlife page. See ourstate animal guidefor the next step.
4. What time of year is best for spotting tree frogs in Pennsylvania?+
Tree frogs are most active from April through September. Breeding season peaks from April to June, when males call loudly at night. Warm, humid evenings after light rain offer the best odds. During dry spells, they retreat to trees and become harder to find. Spring peepers are among the first frogs to call in early spring, often while ice is still on the edges of ponds.
5. How do you identify a tree frog by its call?+
The spring peeper's call is a single, clear whistle repeated about once per second. Gray tree frogs produce a short, melodic trill lasting 1-2 seconds. Cope's gray tree frog has a faster, harsher trill. To hear examples, visit thetree frog species hubwhere we have call recordings. Practice at dusk near breeding ponds.
6. What lookalike species might cause confusion?+
Chorus frogs and cricket frogs are often mistaken for tree frogs. Chorus frogs have a dark stripe through the eye, while tree frogs have a distinct dark line from the snout through the eye. Cricket frogs are smaller, with bumpy skin and no toe pads. True tree frogs have enlarged toe pads for climbing. Boreal chorus frogs are rare in Pennsylvania but can be confused with spring peepers; look for three dark stripes down the back.
Keep exploring
More places to see tree frog
More wildlife in Pennsylvania