10 Types of Frogs in Massachusetts You Can Find Across the Bay State
September 26, 2026
Massachusetts doesn’t have the frog diversity you’d find in the humid South, but that doesn’t mean the state is short on charm. If you’re researching the types of frogs in Massachusetts, the answer is refreshingly simple: the Commonwealth is home to exactly ten native species of frogs and toads, and each one has its own call, color pattern, and favorite hiding spot.
Learning to tell them apart takes more listening than looking, since many of these amphibians spend most of their lives hidden in leaf litter, mud, or the high branches of a swamp maple. This guide breaks down all ten Massachusetts frog species, how they sound, where they live, and what makes each one distinct from its lookalikes. For a broader look at frog diversity outside New England, the different types of frogs found worldwide offer useful context, and if you’re curious about totals, how many types of frogs there are globally puts the Bay State’s ten species into perspective.
| Common Name | Family | Typical Size | Where to Find It in Massachusetts |
|---|---|---|---|
| American Bullfrog | True Frog (Ranidae) | 3.6–6 inches | Permanent ponds and lakes, statewide |
| Green Frog | True Frog (Ranidae) | 2–3.5 inches | Marshes, ponds, river backwaters |
| Gray Treefrog | Tree Frog (Hylidae) | 1.25–2 inches | Wooded swamps and backyards, statewide |
| Pickerel Frog | True Frog (Ranidae) | 1.75–3 inches | Cool streams, meadows, statewide |
| Wood Frog | True Frog (Ranidae) | 1.5–3.25 inches | Forested vernal pools, statewide |
| Spring Peeper | Tree Frog (Hylidae) | 0.75–1.5 inches | Vernal pools and wet woodlands, statewide |
| American Toad | True Toad (Bufonidae) | 2–3.5 inches | Gardens, forest floors, statewide |
| Fowler’s Toad | True Toad (Bufonidae) | 2–3 inches | Sandy coastal wetlands |
| Eastern Spadefoot | Spadefoot Toad (Scaphiopodidae) | 1.5–3 inches | Connecticut River Valley, Cape Cod |
| Northern Leopard Frog | True Frog (Ranidae) | 2–4.25 inches | Wet meadows, mostly mainland counties |
1. American Bullfrog: Massachusetts’s Largest Frog
The Lithobates catesbeianus is the giant of Massachusetts wetlands. The largest frog found in Massachusetts, the American Bullfrog has a green face and a green-brown body, with a ridge of skin that runs from its eye curving around its external eardrum (tympanum). Adults are genuinely large by frog standards.
Adult body lengths range from 3.6 to 6 inches, and some individuals can grow to weigh as much as 1.5 pounds (0.7 kg). Once males mature, they develop a signature trait: once the males of the species reach sexual maturity, their throats turn bright yellow.
Found statewide, the bullfrog inhabits permanent bodies of water such as ponds and marshes and eats almost anything it can grab, including insects it hunts along muddy banks — a diet that overlaps with many of the beetles found throughout Massachusetts. It lays its eggs as a film on the water’s surface rather than in strings like toads do.
Pro Tip: You can hear its deep “jug-a-rum” call in late spring and summer, which is the easiest way to confirm a bullfrog before you ever spot one in the water.
Bullfrogs also range far beyond New England; anglers and pond owners have introduced them well outside their native territory, including into Connecticut’s wetlands and even the volcanic ponds covered in our guide to frogs in Hawaii.
2. Green Frog: A Common Massachusetts Pond Dweller
The green frog (Lithobates clamitans) is one of the state’s most frequently spotted amphibians. Green frogs are extremely common across the state and can be found in marshes, ponds, side-channels and river backwaters.
Color is where things get interesting. Green frogs are, of course, green, sometimes with brown, or even bronze, tones to them, and when their body temperatures drop, they might look completely black, with multiple darker blotches and spots throughout their bodies.
If you’re trying to separate a green frog from a bullfrog, check the sides. The best way to tell them apart from other true frogs is that the dorsal ridge on its back does not go all the way down its back. Their diet is broad: insects and other invertebrates such as slugs, snails, crayfish, caterpillars, flies, moths, and spiders, a menu that occasionally includes the same insects tracked in our roundup of Massachusetts beetle species.
3. Gray Treefrog: Massachusetts’s Camouflage Expert
The gray treefrog (Hyla versicolor) is built for hiding in plain sight. It’s common for their back to display a mottled coloring, much like lichen, and coloration is various shades of brown, gray, red, or green, with females tending to be more brightly colored.
Gray Treefrogs are ubiquitous throughout Massachusetts, and you’ll spot them in a wide variety of wooded habitats, from backyards to forests to swamps. Despite their name, they rarely wander far from the canopy. Gray treefrogs almost never come down from the treetops, and according to the state’s official range data, the species is found statewide except for Martha’s Vineyard island and Nantucket County.
Their sticky toe pads let them cling to bark and leaves the way some western species cling to canyon rock; for a look at how treefrog habits differ regionally, see our guide to frog species in Utah.
4. Pickerel Frog: The Only Toxic Frog in Massachusetts
The pickerel frog (Lithobates palustris) looks almost identical to the northern leopard frog at a glance, but the pattern gives it away. The pickerel frog looks very similar to the Northern Leopard frog; however the pickerel frog has 2 parallel rows of squareish spots down its back.
The pickerel frog is a medium to large sized frog whose dorsal ridge runs down from its eye to its back, enclosing rectangular boxes rather than round spots. These frogs are very common throughout Massachusetts, favoring cool, clear streams and grassy meadows near water.
Important Note: The pickerel frog is the only poisonous frog in Massachusetts. Its skin secretions can irritate mucous membranes and are toxic to pets and other predators, so it’s best admired rather than handled. Readers curious about toxic amphibians elsewhere can compare notes in our guide to poisonous frog species.
Along the East Coast, pickerel frogs share similar habitat preferences with populations documented in Maryland’s wetlands.
5. Wood Frog: Massachusetts’s Freeze-Tolerant Amphibian
Few Massachusetts animals have a survival trick as strange as the wood frog’s (Lithobates sylvaticus). It’s easy to identify by its facial markings: it has a distinct black marking across the eyes, which resembles a mask.
As the name suggests, wood frogs are found in Massachusetts in moist woodland habitats, including forested swamps, ravines, and bogs, and they travel widely to visit seasonal pools to breed. Those seasonal pools are vernal pools, and according to Mass Audubon, by their dark masks and loud quacking, the wood frog migrates on rainy spring nights to vernal pools to breed. Its call backs up that description: their call sounds like a quacking of a duck.
Key Insight: This incredible little frog has adapted to cold climates by being able to freeze over the winter. Its breathing and heartbeat stop, and its body produces a type of antifreeze that prevents its cells from bursting. In the spring, it thaws and begins feeding again. That adaptation makes it one of the first amphibians to emerge after the snow melts.
Wood frog tadpoles show unusual social behavior, too: scientists have found that as tadpoles, siblings will seek each other out and group together. The species ranges far beyond New England, showing up in states as far west as those covered in our Iowa frog guide.
6. Spring Peeper: The Tiny Voice of a Massachusetts Spring
No sound announces spring in Massachusetts quite like the spring peeper (Pseudacris crucifer). The spring peeper measures from 3/4 inch to 1-1/2 inches, making it one of the smallest frogs in the state, yet its voice carries far beyond its size.
Its chorus of a shrill high pitched call can be heard from up to a half mile away, and it’s easy to identify once you know what to look for: it can be distinguished by its dark colored “X” across its back.
Despite its noisy reputation, seeing one takes patience. Like most tree frogs, the spring peeper is nocturnal and loves to hunt ants, spiders and other small insects during the evening — a hunting pattern that overlaps with several species in our Massachusetts ant guide. The species is found statewide.
Pro Tip: Spring peepers are part of the annual amphibian migration Mass Audubon calls “Big Night,” when amphibians like the Spotted Salamander, Jefferson Salamander, Wood Frog, and Spring Peeper awaken from their winter slumber and move to breeding pools on the season’s first warm, rainy evenings.
Peepers show up well beyond New England too, with related populations documented in our Mississippi frog species guide.
7. American Toad: A Backyard Regular
The American toad (Anaxyrus americanus) is likely the amphibian most Massachusetts gardeners have already met. A member of the true toad family Bufonidae, the American toad is brown with large warts and has a white belly with black dots.
American toads are commonly found in gardens all across the state, as well as near ponds and vernal pools, and it can often be found on the forest floor, eating small creatures such as slugs and worms — along with the occasional flying insect, making it a natural predator of species like those in our Massachusetts bee guide.
Its voice is unmistakable once you’ve heard it: its long trilling call is heard in spring and summer, and it lays long strings of eggs. American toads share close relatives across the country, including populations profiled in our Kentucky frog and toad guide.
8. Fowler’s Toad: The American Toad’s Coastal Cousin
Fowler’s toad (Anaxyrus fowleri) is often mistaken for the American toad, and the confusion is understandable. The Fowler’s toad looks a lot like the American toad; however, it has irregular dark blotches, most encompassing three or more warts, and a mostly spotless belly.
Common Mistake: Many people assume any warty brown toad in a Massachusetts garden is an American toad. Check the belly pattern and wart clusters described above before assuming — Fowler’s toads are the pickier species when it comes to habitat.
While Fowler’s toads look quite similar to American toads, they’re much less common. Although they’re not often found inland, they’re relatively populous in coastal areas, where they live in brackish pools, in addition to freshwater ponds, marshes and vernal pools. It’s found in sandy areas near wetlands, and the female lays long strings of eggs in permanent water.
Statewide, Fowler’s toad is found statewide, though possibly extirpated from Nantucket County. Similar coastal-adapted toads appear in our Alabama frog and toad species guide.
9. Eastern Spadefoot: Massachusetts’s Rarest Amphibian
The eastern spadefoot (Scaphiopus holbrookii) is the hardest species on this list to actually see. The elusive eastern spadefoot toad has yellow stripes, small warts, and catlike pupils, and the term “spadefoot” comes from the hard-digging structures on its hind feet.
Rarely seen, it spends much of its time underground or hunting for small prey at night, and after a strong rainfall event during the warm months, it breeds in shallow temporary vernal pools. It can grow to a length of about 3 inches and varies in color from yellow to brown.
Geographically, it’s mostly found in the Connecticut River Valley and eastern Massachusetts, making it a rare find outside those pockets. Its status reflects that scarcity: it is the only frog in Massachusetts that is listed as Threatened under the Massachusetts Endangered Species Act.
Conservation groups have taken notice. In an effort to increase the populations of the once widespread eastern spadefoot toad, Mass Audubon partnered with Zoo New England, the U.S. Fish and Wildlife Service, and the Massachusetts Division of Fisheries and Wildlife to restore over 20 new breeding pools in fields as well as woodland and formerly cultivated land, according to Mass Audubon’s Eastern Spadefoot Toad program. The species’ range extends south along the coast into areas covered in our North Carolina frog species guide.
10. Northern Leopard Frog: A Declining Massachusetts Native
The northern leopard frog (Lithobates pipiens) rounds out the list, and it’s one to watch closely. It is a medium to large semi-aquatic species of frog that varies in color from dark brown to slim green, with fairly large spots all over its body.
Unlike the pickerel frog’s squared, boxy spots, leopard frog markings are rounder and more irregular. Range data from the state shows a more limited distribution than most of its cousins: it’s found statewide except Barnstable, Dukes, and Nantucket counties, and it is potentially declining in Bristol and Plymouth counties.
That decline shows up in independent tracking as well. The species is classified as uncommon and declining, found statewide except Nantucket, Cape Cod, and Dukes County, according to data compiled on Wikipedia’s list of Massachusetts amphibians. Leopard frogs remain more common in the Midwest, where you can compare populations in our Illinois frog species guide or our Nebraska frog species guide.
Ten species may sound modest next to the frog diversity of the Gulf Coast, but Massachusetts makes up for it with variety of habit: treetop dwellers, pond specialists, garden regulars, and one genuinely rare, threatened burrower all share the same small state. Many of these species depend on vernal pools, the temporary wetlands that fill each spring and dry out by summer, which is why protecting these seasonal pools matters as much as protecting permanent ponds and rivers.
If you want to see several species at once, plan a visit during “Big Night,” the first warm, rainy evening of spring when wood frogs and spring peepers migrate to breeding pools en masse. For anyone building a broader identification library, Mass Audubon’s frog guide and the state’s printable amphibian checklist are worth keeping on hand for backyard reference.