Are There Bullfrogs in Tennessee?
Yes, bullfrogs are common throughout Tennessee and are native to the state. These large frogs thrive in ponds, marshes, and slow rivers across all regions of Tennessee. From the Cumberland Plateau to the Mississippi River valley, bullfrogs breed in nearly every suitable water body. Their loud calls are a characteristic sound of Tennessee's summer wetlands and aquatic ecosystems.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated August 6, 2026.
Yes, bullfrogs are common throughout Tennessee and are native to the state. These large frogs thrive in ponds, marshes, and slow rivers across all regions of Tennessee. From the Cumberland Plateau to the Mississippi River valley, bullfrogs breed in nearly every suitable water body. Their loud calls are a characteristic sound of Tennessee's summer wetlands and aquatic ecosystems.
Where Bullfrogs Are Found in Tennessee
Bullfrogs inhabit diverse aquatic habitats throughout Tennessee, from the eastern mountains to the western lowlands. The Tennessee River system, the state's largest river, supports abundant bullfrog populations along its entire Tennessee course from north to south. The Cumberland River drainage in middle and western Tennessee provides excellent habitat with extensive marshes and backwater areas. The Mississippi River forms Tennessee's western border and supports populations in its slower sections. Eastern Tennessee's mountain streams and associated ponds support populations despite cooler water temperatures. The Holston River system in northeastern Tennessee provides suitable habitat. Numerous reservoirs throughout the state, including Kentucky Lake, Watts Bar Lake, and many smaller impoundments, host bullfrog populations in vegetated areas. Swamps and marshes in western Tennessee provide ideal breeding habitat. Learn more aboutbullfrogs in Tennesseeand explore the broaderTennessee wildlife. Urban and suburban ponds in Nashville, Memphis, Knoxville, and other cities support thriving populations. Seethe Bullfrog guide for Tennesseefor more.
Season and Timing for Bullfrogs in Tennessee
Bullfrogs in Tennessee become active in late spring, typically beginning in May as water temperatures rise above 50 degrees Fahrenheit. Males establish territories and initiate calling by June, with peak vocalization occurring from mid-June through August. Tennessee's warm climate allows breeding activity to continue longer than northern states, often extending into September. Breeding activity is most intense during July and August when water temperatures reach optimal levels between 70 and 80 degrees Fahrenheit. Female bullfrogs lay massive egg masses beginning in late June and continuing throughout the summer, depositing them in shallow, vegetated areas of ponds, marshes, and reservoirs. Tadpole development progresses in Tennessee's warm waters but still requires one to two years to completion. By late August and September, adult calling activity decreases as temperatures begin to drop. Bullfrogs remain active through mild Tennessee winters, particularly in middle and western portions of the state. Spring warming in April and May triggers emergence and the resumption of territorial calling behavior. Seethe Tennessee wildlife guidefor more.
How to Identify a Bullfrog
Bullfrogs are Tennessee's largest frogs, typically measuring 3.5 to 6.5 inches in length, with exceptional individuals exceeding 8 inches. Their useful body is bright green to olive green with smooth, wet-appearing skin. The most distinctive identification feature is the large, prominent eardrums (tympana) located just behind each eye, appearing as obvious circular discs as wide as the eye itself. Adult males are slightly larger than females and develop yellowish throats during breeding season. Males also exhibit enlarged eardrums and thickened front legs adapted for powerful jumping and territorial wrestling. Female bullfrogs typically remain entirely green without throat color changes. Coloration ranges from bright emerald to dull olive, with some individuals displaying darker backs with light spotting or mottling patterns. Males produce the distinctive loud call that gives these frogs their common name, a deep resonant sound resembling jug-o-rum, a banjo note, or a human bass voice. This deep, recognizable call is audible from considerable distances across water and serves as the most reliable field identification method throughout Tennessee.
Where Sightings Concentrate in Tennessee
Bullfrogs concentrate in specific habitat types throughout Tennessee where wetland conditions favor breeding success. The Tennessee River floodplain supports extensive populations, particularly in backwater areas and side channels. Oxbow lakes along the Mississippi River in western Tennessee host significant populations in protected areas. The Cumberland River system, particularly around Nashville and Clarksville, supports notable concentrations. Reelfoot Lake in northwestern Tennessee provides unique habitat with dense cypress swamps supporting abundant frogs. Numerous reservoirs throughout the state including Watts Bar Lake, Tellico Lake, and others provide shallow marsh habitat. The Hiwassee River system in eastern Tennessee supports breeding populations. Wetland management areas throughout Tennessee, including various state wildlife refuges, provide protected habitat. VisitTennessee wildlife informationfor details about specific public access areas, refuges, and managed viewing locations throughout the state where bullfrogs can be reliably observed.
Typical Behavior of Bullfrogs
Bullfrogs are ambush predators that remain motionless on pond banks and shallow vegetation throughout the day, waiting for prey to venture within striking distance. They feed on insects, smaller frogs, tadpoles, crayfish, small fish, and occasionally young birds or mammals that approach the water's edge. Their large mouths and expandable throats allow consumption of surprisingly large prey items, and they frequently attempt to eat anything they can fit inside. Male bullfrogs are highly territorial during breeding season, vocalizing loudly to attract females and repel competing males. Males engage in physical wrestling matches with rivals, attempting to push competitors away from prime calling and mating locations. Female bullfrogs lay massive egg masses containing up to 20,000 eggs in shallow, densely vegetated areas of ponds, marshes, and reservoirs. Bullfrogs are primarily nocturnal hunters, becoming most active at dusk and throughout the night when aquatic prey activity increases. Their loud vocalizations during breeding season serve dual purposes of attracting mates and establishing territorial dominance over competitors. In Tennessee's warm climate, bullfrogs may remain somewhat active during mild winters, continuing to forage in deeper water.
Coexistence and Safety Notes
Bullfrogs in Tennessee are native species managed under state wildlife regulations administered by the Tennessee Wildlife Resources Agency. Collection or possession may be regulated by local guidelines, so check current regulations before collecting. While bullfrogs are not dangerous to humans, they possess powerful hind legs capable of delivering surprising kicks when handled. They will not bite in the manner of snapping turtles or water snakes, though they may attempt to consume fingers if perceiving them as food. Approaching bullfrogs quietly and slowly provides the best observation opportunity without causing stress to the animals. Children should be closely supervised near Tennessee's water bodies to prevent accidental falls or drowning risks. Bullfrogs are important predators within Tennessee's freshwater and brackish wetland ecosystems, consuming large quantities of insects and small animals. Their presence contributes to aquatic food webs, though they also consume other amphibian species. Do not release captive bullfrogs into wild water systems, as this disrupts established populations and ecological relationships.
Common Species Confused With Bullfrogs
The green frog is the most commonly confused species with bullfrogs in Tennessee, though distinctly smaller at 2.5 to 3.5 inches. Green frogs display a ridge running down each side of the body and have smaller eardrums relative to head size compared to bullfrogs. Pig frogs are smaller at 2 to 2.75 inches and inhabit similar swamp habitats but lack the obvious eardrums of bullfrogs. Leopard frogs, though rare in Tennessee, display distinctive spotted patterns and are smaller than bullfrogs. Southern leopard frogs found in coastal areas display distinctive spots arranged in rows. Cricket frogs are tiny, less than 1.5 inches, with rough warty skin unlike smooth bullfrogs. Narrowmouth toads are small and fossorial, inhabiting leaf litter rather than open water. Spring peepers are tiny at under 1.5 inches with a high-pitched peep call very different from bullfrog calls. Correct identification helps maintain understanding of Tennessee's rich amphibian diversity and ecological communities.
Frequently Asked Questions About Bullfrogs
Are bullfrogs native to Tennessee? Yes, bullfrogs are native to Tennessee and are part of the state's natural amphibian fauna throughout all regions. What do bullfrog tadpoles look like? Bullfrog tadpoles are large, greenish to brownish in color, and can reach 6 inches in length before undergoing metamorphosis into juvenile frogs. Can bullfrogs harm native Tennessee species? Yes, bullfrogs are predatory and will consume smaller frogs and fish, though predation is part of natural wetland ecosystem balance in Tennessee. Where can I hear bullfrogs in Tennessee? The Tennessee River valley, Reelfoot Lake area, Cumberland River floodplain, and most marshes and ponds throughout the state offer excellent opportunities to hear bullfrogs during summer evenings.
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