Tree Frogs in New Jersey: identification guide and best places to start

What tree frog species are found in New Jersey?

New Jersey hosts several tree frog species. The most widespread is the gray tree frog (Hyla versicolor), known for its ability to change color. The spring peeper (Pseudacris crucifer) is tiny but vocal, often the first to call in early spring. The pine barrens tree frog (Hyla andersonii) is a rare gem found only in the southern part of the state. For a deeper look at each species, check out our complete guide to tree frogs.

Where are the best places to spot tree frogs?

Your best odds are near freshwater wetlands, ponds, and slow-moving streams. In the Pine Barrens, the pine barrens tree frog favors shallow, acidic waters. The Great Swamp National Wildlife Refuge and Wharton State Forest are excellent starting points. Even suburban backyards with a small pond or damp area can attract tree frogs. For more New Jersey wildlife spots, visit our New Jersey wildlife page.

When is the best time to see tree frogs?

Spring and summer are prime seasons. Spring peepers start calling as early as March on warm, rainy nights. Gray tree frogs become active from April through September. The best time of day is just after sunset, especially following a light rain when humidity is high. Overcast evenings often yield the most activity. If you're planning a trip, aim for late April through June for the widest variety of calls.

See our state animal guide for the next step.

How can you identify New Jersey's tree frogs?

Focus on size, toe pads, and color patterns. Gray tree frogs are 1.5 to 2 inches long with large toe pads and often a dark X-shaped mark on their back. Spring peepers are smaller (under 1 inch) with an X on their back too, but a darker brown than the gray tree frog's gray or green. The pine barrens tree frog has bright green back with a purple stripe and yellow underside. For additional ID tips, see our tree frog identification page.

What do tree frog calls tell you?

Each species has a unique call. Spring peepers produce a high-pitched, repeated 'peep' that carries far. Gray tree frogs give a short, musical trill lasting about half a second. The pine barrens tree frog's call is a nasal 'quonk' often repeated. Learning these calls helps you locate frogs without disturbing them. Many people find that listening first then approaching slowly works best.