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

Maryland is home to two primary tree frog species. The gray tree frog (Hyla versicolor) is the larger of the two, reaching about 1.5 to 2 inches long, and can shift between gray and green coloration to match its surroundings. The spring peeper (Pseudacris crucifer) is smaller, typically under 1.5 inches, with a distinctive dark X marking on its back. Both species are tree dwellers with adhesive toe pads that allow them to climb smooth surfaces. A third species, the northern cricket frog (Acris crepitans), is sometimes mistaken for tree frogs but has warty skin and shorter legs. All three are native to Maryland and adapted to local wetlands and woodland habitats. For a complete overview of tree frog habitats and behaviors, check out our tree frog identification guide.

Tree frogs in Maryland are most often found in moist environments like the edges of ponds, marshes, and slow-moving streams. They also frequent wooded areas with plenty of leaf litter and shrubs. You are most likely to notice them clinging to vegetation or windows near lights at night, especially during their breeding season in spring and early summer. Swamps and forested wetlands in counties like Somerset, Dorchester, and Wicomico provide ideal habitat. In Maryland, tree frog sightings usually improve when you slow down and match your first stop to where people are most likely to notice them. Use the state wildlife hub and the route guide to narrow your first area, then check access, weather, and distance before you settle in. A short walk with one clear viewing plan often beats covering too much ground, especially when habitat changes fast from open edges to brush, wetlands, timber, shoreline, or neighborhood cover.

The best time to spot tree frogs in Maryland is from late March through early September. Warm, humid evenings after a rain are ideal because the frogs become active and call loudly. The gray tree frog calls on warm nights from April to August, with peak chorus activity in May and June. Spring peepers are heard earliest in the spring, sometimes as early as February during warm spells, with breeding activity peaking in March and April. Evening hours between 7 PM and 11 PM offer the highest chance of hearing calls. Our Maryland wildlife hub has seasonal tips for other species too.

Maryland's tree frogs include the gray tree frog (which can change color from gray to green) and the smaller spring peeper (with a dark X on its back). The northern cricket frog is a common lookalike but has warty skin and shorter legs. Listen for the gray tree frog's trill and the peeper's high-pitched whistle. To distinguish them, note that gray tree frogs have large toe pads and a light spot under each eye, while spring peepers are less than 1.5 inches long. When you see a tree frog clinging to bark or a leaf, check the size first, then the toe pad size and any distinctive markings. See our state animal guide for the next step.

Some of the best spots for tree frog watching include the wetlands of Patuxent Research Refuge near Laurel, the marshes of Eastern Neck National Wildlife Refuge on the Eastern Shore, and the wooded ponds of Catoctin Mountain Park in Frederick County. The Blackwater National Wildlife Refuge in Dorchester County is excellent for spring peepers in late winter and early spring. State parks like Pocomoke River State Park and the Eastern Shore wetland complexes provide accessible trails near prime tree frog habitat. Managed wetland edges with cattails and open water are particularly productive in April through June when calling activity peaks.