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

Are there tree frogs in Delaware?

Delaware is home to two common tree frog species: the Cope's gray tree frog (Hyla chrysoscelis) and the green tree frog (Hyla cinerea). Both are found statewide but are more abundant in the southern counties. They inhabit areas near permanent water sources with plenty of trees or shrubs for climbing.

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

Your best bets are wetlands, ponds, and slow-moving streams, especially those bordered by hardwood forests. In southern Delaware, the Great Cypress Swamp and red maple swamps are prime spots. In the north, try along the Christina River or White Clay Creek Preserve. Backyard ponds with native vegetation also attract them.

What season and weather patterns increase your odds of spotting them?

Tree frogs are most active from late April through July. Warm, humid evenings after a rainfall are peak times. They call and breed in wet conditions, so a summer thunderstorm followed by a calm night is the perfect window. Look for them clinging to cattails, tree trunks, or porch lights where insects gather.

See our state animal guide for the next step.

How can you tell Delaware's tree frogs apart from similar species?

Focus on three cues: toe pads, color, and call. Both tree frogs have large sticky toe pads (look like suction cups). Cope's gray tree frog is gray or green with dark mottling and a bright yellow flash on its inner thighs. Green tree frogs are smooth, bright green with a white or yellow stripe down each side. Their calls differ: Cope's has a fast nasal trill, while green tree frogs make a single metallic "quank." Avoid confusing them with spring peepers, which are much smaller with an X-shaped mark on their backs. For more ID tips, browse our tree frog identification page.

What time of day are tree frogs most active?

Tree frogs are nocturnal. They start calling and moving around at dusk and remain active through the night. During the day they hide under leaves, in tree holes, or on the shaded sides of branches. If you want to see one, go out with a flashlight after dark and follow the sound.