The United States is home to a fascinating variety of snakes, ranging from harmless rat snakes to massive invasive species that dominate ecosystems. While some are native and essential to their environments, others pose challenges due to their size and predatory behaviors. Here, we explore the 13 largest snakes in the U.S., showcasing their impressive lengths and unique characteristics.
13. Western Diamondback Rattlesnake — 7 Feet
The western diamondback rattlesnake, one of two venomous snakes on this list, can grow up to 7 feet long. Found in deserts, grasslands, and forests from Arkansas to California, this snake delivers potent venom, with yields averaging 250–350 mg per bite. Its distinctive light gray or brown body features dark diamond-shaped patterns, making it both striking and intimidating.
12. Eastern Rat Snake — 7.5 Feet
Also known as the black rat snake, this nonvenomous species reaches up to 7.5 feet in length. Eastern rat snakes are excellent climbers and are often found near urban areas, fields, and woodlands. They are black with white markings on their chin and belly and prey on rodents, birds, and lizards. These constrictors are crucial for pest control.
11. Eastern Diamondback Rattlesnake — 8 Feet
Reaching up to 8 feet, the eastern diamondback rattlesnake is considered one of the most dangerous snakes in the U.S. With hemotoxic venom and fangs proportionally longer than other rattlesnakes, its bite is formidable. Found in the southeastern U.S., it inhabits pine forests, sandy woodlands, and cypress swamps.
10. Bullsnake — 8 Feet
A subspecies of the gopher snake, bullsnakes can reach lengths of 8 feet. These nonvenomous snakes mimic rattlesnakes when threatened, raising their heads, hissing, and vibrating their tails. Found in grasslands and forests, they are powerful constrictors preying on small mammals and birds.
9. Coachwhip — 8.5 Feet
Named for its braided appearance, the coachwhip can grow up to 8.5 feet. The eastern subspecies features a black head and neck that lightens toward the tail. This nonvenomous snake lives in southern U.S. fields and forests, preying on birds, rodents, and lizards. Myths about coachwhips chasing humans are unfounded.
8. Eastern Indigo Snake — 9 Feet
The eastern indigo snake, native to the southeastern U.S., is the longest native snake in the country, reaching 9.2 feet. It has a smooth, blue-black body with reddish-brown chin markings. These apex predators thrive in hardwood forests and swamps, feeding on small mammals, birds, and amphibians.
7. Asiatic Rock Python — 10 Feet
Also known as the Indian python, this invasive species grows up to 10 feet. Introduced through the pet trade, Asiatic rock pythons now inhabit areas like Texas, where they threaten native wildlife. They are constrictors with tan and dark brown blotches on a yellowish background.
6. Boa Constrictor — 15 Feet
The red-tailed boa, or boa constrictor, reaches up to 15 feet and has established populations in Florida. These invasive snakes prey on local wildlife and adapt to swamps, forests, and riverbanks. Their cream or brown bodies feature reddish-brown “saddle” markings near the tail.
5. Burmese Python — 16 Feet
Burmese pythons, known for their impact on Florida’s Everglades, can grow to 16 feet. Their dark brown bodies with black-bordered blotches help them blend into their surroundings. As apex predators, they have significantly reduced populations of native species.
4. Southern African Rock Python — 16 Feet
With a typical length of 9–13 feet but capable of growing to 16 feet, these pythons are invasive in Texas. Native to South Africa, they have brown bodies with dark blotches bordered by lighter colors. They are powerful predators, consuming a wide range of prey.
3. Central African Rock Python — 20 Feet
At 20 feet, the Central African rock python is one of the largest snakes in the U.S. Its brown body features black-bordered blotches, with a unique spear-shaped marking on its head. Native to Africa, these adaptable predators thrive in various environments.
2. Green Anaconda — 30 Feet
Green anacondas are the heaviest and second-longest snakes in the U.S., growing up to 30 feet and weighing 550 pounds. These apex predators inhabit swamps and rivers, ambushing prey like deer. Their olive-green bodies have black blotches and occasional yellow spots.
1. Reticulated Python — 32 Feet
The reticulated python, the longest snake in the U.S., can reach a staggering 32 feet. Native to Southeast Asia, it has been introduced to the U.S. through the pet trade. Its brown body with diamond-shaped markings and its ability to overpower large mammals make it a formidable predator.
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