Cornfields and prairies don’t look like frog country at first glance, but Iowa quietly supports one of the richest amphibian communities in the Midwest. Seventeen native species of frogs and toads call the state home, ranging from a treefrog no bigger than a thumbnail to a bullfrog that can tip the scales at a pound and a half. Learning the types of frogs in Iowa isn’t just a backyard curiosity — it’s a window into the health of the wetlands, prairies, and woodlands these animals depend on.
This guide walks through every species documented in the state, with identification pointers, calls, and habitat notes drawn from wildlife records and field surveys. Several of these same species, including the American toad, Cope’s gray treefrog, and spring peeper, also rank among the common native frogs in Michigan and other upper Midwest states, so much of what follows applies well beyond Iowa’s borders.
| Species | Typical Adult Size | Best Time to Hear/See | Common Habitat |
|---|---|---|---|
| American Toad | 2–3.5 in | April–July | Gardens, woodlands, yards |
| Blanchard’s Cricket Frog | 0.6–1.5 in | May–August | Pond and stream edges |
| Boreal Chorus Frog | 0.75–1.5 in | March–May | Wet prairies, ditches |
| American Bullfrog | 3.6–6 in | May–August | Lakes, ponds, rivers |
| Cope’s Gray Treefrog | 1.25–2 in | April–July | Wooded wetlands |
| Crawfish Frog | 2–3.5 in | March–April | Prairies near crayfish burrows |
| Fowler’s Toad | 2–3 in | May–July | Sandy soils, floodplains |
| Great Plains Toad | 2–3.5 in | May–July | Prairies, farmland |
| Green Frog | 2–3.5 in | May–August | Ponds, slow streams |
| Northern Leopard Frog | 2–4.5 in | April–June | Marshes, wet meadows |
| Pickerel Frog | 1.75–3 in | April–June | Clear streams, springs |
| Plains Leopard Frog | 2–3.5 in | April–July | Prairie ponds, fields |
| Plains Spadefoot | 1.5–2.5 in | After summer rains | Sandy prairies |
| Southern Leopard Frog | 2–3.5 in | March–June | Wetlands, floodplains |
| Eastern Gray Treefrog | 1.25–2 in | April–July | Forest edges, yards |
| Spring Peeper | 0.75–1.25 in | March–May | Woodland ponds |
| Woodhouse’s Toad | 2–3 in | May–July | River valleys, sandy soil |
1. American Toad
The American toad (Anaxyrus americanus) is one of the most familiar amphibians in Iowa, turning up in gardens, under porches, and along woodland edges across the entire state. It has warty, dry-looking skin in shades of brown, gray, or brick red, with a pair of swollen parotoid glands behind each eye that secrete a mild irritant used to discourage predators. If you ever wondered how toxic some amphibians really get, the poisonous frog species found elsewhere in the world make the American toad’s defenses look mild by comparison.
Its call is a long, musical trill that can last up to 30 seconds, usually heard from shallow pools and ditches in spring. A 2025 Iowa DNR volunteer survey found the American toad among the most frequently detected species statewide, alongside the chorus frog, cricket frog, and eastern gray treefrog. In 2025, call data was collected at 893 sites and 15 different frog and toad species were identified, with chorus frogs, American toads, cricket frogs and eastern gray treefrogs the four most common species recorded.
2. Blanchard’s Cricket Frog
Blanchard’s cricket frog (Acris blanchardi) is a tiny, warty frog rarely longer than an inch and a half, often mistaken for a baby toad until you hear its call — a series of clicks that sound remarkably like two pebbles being tapped together. Coloring varies from gray to green to brown, usually with a rough-skinned, mottled pattern that helps it disappear against mud and leaf litter near pond edges. Unlike true treefrogs, cricket frogs rarely climb; they stay low along the shoreline and leap in short, rapid bursts when disturbed.
This species favors open, sunny banks of ponds, slow streams, and wetland margins, a habitat type shared with several other prairie-adapted amphibians described in this guide. Readers interested in how wetland specialists differ from upland species can compare notes with the frogs found in grassland habitats more broadly. The species was recorded at a strong number of survey sites in the 2025 DNR count, confirming it remains widespread across Iowa’s river systems.
3. Boreal Chorus Frog
The boreal chorus frog (Pseudacris maculata) is one of the earliest frogs to call in an Iowa spring, often starting in March while patches of ice still linger on ponds. It’s a small frog, under an inch and a half, typically tan or gray with three dark stripes running down its back and a dark stripe through the eye. The call is a rising “crreek” often compared to a thumb dragged along the teeth of a plastic comb.
According to the Iowa DNR’s statewide calling survey, the chorus frog was the most commonly recorded species at 893 survey sites in 2025, detected at more locations than any other frog or toad in the state. This species ranges west into the southern Great Plains as well, overlapping with amphibian communities described in guides to frogs found in Oklahoma.
Pro Tip: Chorus frogs and spring peepers both call early in the season and can sound similar to beginners. Listen for rhythm: the chorus frog’s call rises in pitch like a finger over a comb, while the peeper gives a single, clear “peep” repeated steadily.
4. American Bullfrog
The American bullfrog (Lithobates catesbeianus) is the giant of Iowa’s wetlands and the largest frog species in the state. Adult body lengths range from 3.6 to 6 inches, and they can grow to weigh as much as 1.5 pounds. Coloration runs from olive green to brown, often with darker mottling, and the back feet are fully webbed for powerful swimming.
Bullfrogs are named for their deep, resonant call, often described as sounding like a bull bellowing across the water. They are known to eat just about anything they can fit in their mouth and swallow, including other frogs, fish, turtles, small birds, bats, rodents, insects, crustaceans, and worms. This same opportunistic appetite has made the species invasive outside its native range, including introduced populations in parts of the frog species found in California, where it preys heavily on native amphibians.
5. Cope’s Gray Treefrog
Cope’s gray treefrog (Hyla chrysoscelis) is visually identical to its sister species, the eastern gray treefrog, and the two can only be told apart reliably by call or by chromosome count. Both have warty, mottled gray-to-green skin that shifts tone depending on temperature and background, plus bright yellow-orange patches on the inner thighs that flash when the frog jumps. Iowa’s herpetological records group the two under a “Gray Treefrog Complex” because of how closely they resemble one another.
Cope’s gray treefrog gives a faster, harsher trill than its counterpart, often heard from trees and shrubs near breeding ponds in late spring. The species ranges across much of the eastern United States, reaching into the frog populations found in Pennsylvania and other Appalachian states, where it shares the same taxonomic puzzle with the eastern gray treefrog.
6. Crawfish Frog
The crawfish frog (Lithobates areolatus) is one of Iowa’s rarest and most secretive amphibians, named for its habit of sheltering in abandoned crayfish burrows rather than digging its own. It’s a stocky, medium-to-large frog with a pale brown or tan background covered in large, dark, rounded spots edged in lighter rings. Because it spends most of the year underground, surfacing mainly to breed in early spring, sightings are uncommon even where populations exist.
Iowa’s wildlife records list the crawfish frog as an endangered species in the state, confined mostly to native prairie remnants along the southern border where crayfish burrows and undisturbed grassland still persist. Anyone curious about how many frog species exist worldwide, and how specialized a single species like this one can become, can explore the broader context in this breakdown of how many types of frogs exist.
7. Fowler’s Toad
Fowler’s toad (Anaxyrus fowleri) is a close relative of the American toad but tends to run smaller and drier-skinned, with three or more warts inside each of its larger dark back spots — a reliable field mark once you know to look for it. Fowler’s toads live in the plains of southeastern Iowa, and other areas in the southeastern United States, favoring sandy soils near rivers and floodplains where they can burrow during dry spells.
This species is genuinely uncommon in Iowa. The 2025 statewide call survey found it among the least-detected frogs and toads in the state, turning up at only a handful of monitored sites. Fowler’s toad’s range extends south into states covered in this guide to frog species in South Carolina, where it’s considerably more common.
8. Great Plains Toad
The Great Plains toad (Anaxyrus cognatus) is a large, pale toad with distinctive paired dark blotches running down its back, each blotch often outlined in a lighter color, giving it a somewhat symmetrical, almost painted appearance. It favors open prairie and agricultural land in western Iowa, where it can burrow deep into loose soil to escape heat and drought.
The Great Plains toad was among the rarest species detected on the 2025 DNR survey, along with the pickerel frog and Woodhouse’s toad. Its range extends much farther west and south, overlapping with desert-adapted amphibian communities described in guides to frog species in Arizona, where similarly drought-tolerant species have evolved comparable survival strategies.
Pro Tip: Most of Iowa’s toads are easiest to find right after a warm summer rain, when males emerge en masse to call from temporary pools and roadside ditches that fill quickly after a storm.
9. Green Frog
The green frog (Lithobates clamitans) is a common, medium-sized frog found in permanent ponds, slow streams, and lake edges across the eastern half of Iowa. Its coloration is normally green or brown with darker mottling or spots on the back, and ridges run down the sides with webbed hind feet. The call is a single, loose “gunk,” often compared to the pluck of a banjo string, which makes it easy to distinguish from the bullfrog’s deeper bellow.
Green frogs are strongly territorial around breeding sites and will often remain at the same pond for an entire summer, making them one of the more reliably spotted species once you find a good location. Their range overlaps with several southern populations covered in this guide to the frog species of North Carolina.
10. Northern Leopard Frog
The northern leopard frog (Lithobates pipiens) is arguably Iowa’s most recognizable frog, with smooth green-to-brown skin covered in large, irregular dark spots and a pair of light ridges running down the back. Adults range from 2 to 4.5 inches long, with smooth skin that’s green, brown, or yellow-green with large dark spots, and lighter-colored raised ridges extending down the length of the back.
Look for this species near slow-moving water with abundant vegetation — ponds, marshes, and quiet streams are all good bets. They can be spotted near ponds, lakes, streams, and marshes, and during spring breeding season males float in shallow pools emitting a low call that sounds a bit like snoring. Populations have declined in parts of their range, making sightings especially worth documenting for community science projects.
11. Pickerel Frog
The pickerel frog (Lithobates palustris) looks similar to the leopard frog at a glance, but its spots are square or rectangular rather than rounded, arranged in two neat rows down the back. One unusual trait sets it apart from nearly every other frog on this list: its skin secretes a mildly toxic substance that can actually be harmful to other frogs and small predators if the pickerel frog is handled roughly, a defense mechanism shared with some of the poisonous frog species found elsewhere in the world.
The pickerel frog was one of the rarest species detected in Iowa’s 2025 statewide call survey, favoring cool, clear streams, springs, and rocky-bottomed creeks rather than the warm, still ponds many of its relatives prefer. Its restricted habitat needs likely explain why it’s harder to find than most of Iowa’s other leopard-frog relatives.
12. Plains Leopard Frog
The plains leopard frog (Lithobates blairi) is one of three leopard frog species native to Iowa, and it’s the one most associated with the southern half of the state. Plains leopard frogs can be brown, gray, or olive-colored, with dark blotches on their back and a bar pattern on their legs. Unlike the northern leopard frog, it lacks the pale dorsal ridges and has a shorter, rounder head profile.
In spring, males produce a chuckling sound to call a mate, and plains leopard frogs are one of the most common species in southern Iowa, becoming especially active during warm, rainy seasons. They move readily across land between water sources, which makes them one of the more mobile frogs described in this guide.
13. Plains Spadefoot
The plains spadefoot (Spea bombifrons) is an odd, toad-like burrower with smooth, moist skin instead of the warty texture most people expect from a toad, and a distinctive hardened, spade-shaped structure on each hind foot used for digging backward into loose soil. It has vertical, cat-like pupils, a feature that immediately separates it from every true toad and frog on this list.
This species spends the vast majority of its life underground in western Iowa’s sandy prairie soils, surfacing explosively after heavy summer rains to breed in temporary pools that may dry up within days. Because breeding is tied so tightly to unpredictable rainfall, some years pass with almost no reported sightings at all, followed by sudden mass emergences after a major storm front.
14. Southern Leopard Frog
The southern leopard frog (Lithobates sphenocephalus) is the least common of Iowa’s three leopard frog species, generally restricted to the far southeastern corner of the state near the Mississippi River floodplain. It has a slimmer build than its northern relative, a pointed snout, and a pale spot in the center of the eardrum that helps separate it from both the northern and plains leopard frogs.
Its range extends much farther south and east, overlapping with amphibian communities described in this guide to frog species found in Alabama, where it’s considerably more abundant than in Iowa’s limited northern range edge. In Iowa, it favors floodplain wetlands and backwater sloughs that flood seasonally along major rivers.
15. Eastern Gray Treefrog
The eastern gray treefrog (Hyla versicolor) rounds out Iowa’s gray treefrog complex alongside Cope’s gray treefrog, and the two are essentially impossible to separate by sight alone. Both have the same mottled gray-green skin, rough texture, and bright patches on the hidden parts of the thighs, but the eastern species gives a noticeably slower, more musical trill than Cope’s faster call.
The 2025 Iowa DNR survey listed the eastern gray treefrog among the four most frequently detected species statewide, found at a strong proportion of monitored wetland and woodland sites. Its range also reaches well into the upper Midwest and New England, overlapping with populations covered in this guide to frog species found in Connecticut.
16. Spring Peeper
The spring peeper (Pseudacris crucifer) is instantly recognizable by its call, a single, high-pitched “peep” repeated roughly once per second, often rising into a deafening chorus from woodland ponds on the first warm nights of the year. It’s a tiny frog, rarely longer than an inch and a quarter, tan to brown with a distinctive dark X-shaped marking across its back.
Spring peepers begin calling earlier than almost any other Iowa species, frequently starting in late March while nighttime temperatures still dip near freezing. Like most treefrogs, the spring peeper is largely nocturnal and spends its daylight hours hidden in leaf litter or low vegetation near its breeding pond. The species ranges across most of the eastern United States, including populations detailed in this guide to frog species found in Pennsylvania, where similar woodland choruses mark the start of spring.
17. Woodhouse’s Toad
Woodhouse’s toad (Anaxyrus woodhousii) is a large, pale toad with a prominent cranial crest between the eyes and a narrow light stripe running down the center of its back, a trait shared with several related toad species but still useful for quick identification in the field. It favors sandy river valleys and floodplain habitats in western and southern Iowa.
Woodhouse’s toad was among the rarest species recorded in Iowa’s 2025 statewide calling survey, turning up at relatively few sites compared to its more widespread toad relatives. Its range extends well into the arid western United States, overlapping with hardy desert-adapted species found in guides to frog species found in Idaho.
Pro Tip: True toads like the American, Fowler’s, Great Plains, and Woodhouse’s toads all have dry, warty skin and short legs built for hopping rather than long-distance jumping. If an amphibian has smooth, moist skin and powerful hind legs, it’s almost certainly a true frog instead.
Final Thoughts on Iowa’s Frogs and Toads
Seventeen species is a remarkable amount of amphibian diversity for a landlocked, agriculture-heavy state, and it reflects just how much habitat variety still survives in Iowa’s remaining prairies, wetlands, and river corridors. From the explosive, rain-triggered emergence of the plains spadefoot to the year-round presence of the American bullfrog, each species fills a slightly different ecological niche.
Many of these same frogs and toads also show up on lists of Michigan amphibians and other upper Midwest states, so the identification skills built here transfer easily if you travel. For a broader look at amphibian diversity beyond the Midwest, the full breakdown of different frog species around the world is a useful next stop, as is this guide to how many frog species exist globally.