Tree Frogs in Pennsylvania: identification guide and best places to start

Where are people most likely to notice tree frogs in Pennsylvania?

Look for tree frogs in moist, forested areas near water: wetlands, ponds, streams, and vernal pools. Backyards with dense shrubs, rain gardens, or birdbaths also attract them. Gray tree frogs climb trees and hide under bark, while spring peepers stay low in grasses and leaf litter. Check around porch lights on warm evenings insects gather there, and frogs follow.

What season or weather patterns help you spot tree frogs?

Spring is prime time. Breeding starts in March for spring peepers and April for gray tree frogs. Warm, rainy nights trigger movement and calling. The best windows are after a heavy rain from April through June. Later in summer, young frogs disperse, and you might spot them near garden beds or on window screens after thunderstorms.

What simple ID cues separate tree frogs from lookalikes?

Three key features: enlarged toe pads (sticky pads), smooth skin, and a slender body. Gray tree frogs can change color from gray to green, but always have bright yellow-orange under the thighs. Spring peepers are tiny (under 1.5 inches) with a dark X on their back. Their call is a high-pitched peep. Compare with leopard frogs which have spots and no toe pads.

See our state animal guide for the next step.

Which tree frog species are found in Pennsylvania?

Pennsylvania hosts two main tree frog species: the gray tree frog (Hyla versicolor) and the spring peeper (Pseudacris crucifer). The western chorus frog (Pseudacris triseriata) is sometimes grouped with tree frogs and lives in the northwest. The mountain chorus frog is rare. Explore our tree frog hub for detailed species profiles and call recordings.

How can you attract tree frogs to your backyard?

Create a small pond or water feature without fish (fish eat eggs). Plant native shrubs, ferns, and grasses. Leave leaf litter and logs for hiding spots. Turn off outdoor lights to reduce insect attraction and frog stress. A shallow dish of dechlorinated water can also draw them in. These steps make your yard a viable stop for breeding and feeding.