How Large Do Snakes Get in Nashville? Up to 10 Feet

Most people are surprised to learn that some of the snakes living in Nashville backyards, crawlspaces, and wooded lots can reach lengths of eight, nine, even ten feet. That's not a misidentification — Middle Tennessee is home to several species capable of impressive size, and one in particular regularly tops the ten-foot mark.

Understanding how large Nashville's snakes can get helps with identification, and identification is the first step toward knowing whether you're dealing with something dangerous or something harmless.

Here's a complete size breakdown of the species you're most likely to encounter in the Nashville area.

The Eastern black rat snake (Pantherophis alleghaniensis) is the undisputed size champion of Middle Tennessee. Adults commonly reach six to seven feet, and large individuals regularly exceed eight feet. Verified specimens approaching ten feet have been documented in Tennessee.

Despite their intimidating size, black rat snakes are non-venomous and pose no danger to humans. They're actually beneficial — a single rat snake can dramatically reduce rodent populations on a property. They're constrictors, killing prey by coiling around it rather than using venom.

Black rat snakes are excellent climbers and are frequently found in attics, barns, and trees, as well as at ground level. Their size alone tends to cause alarm, but a ten-foot black rat snake is far less dangerous than a two-foot copperhead.

Adult size range: 4 to 10 feet, averaging 6–7 feet
Venomous: No

The gray rat snake (Pantherophis spiloides) is closely related to the black rat snake and overlaps with it in Middle Tennessee. Gray rat snakes are slightly smaller on average but still reach impressive lengths. Adults in the five-to-six-foot range are common, and larger individuals approaching seven feet are documented.

Like their black counterparts, gray rat snakes are constrictors, excellent climbers, and beneficial rodent hunters. They're frequently found in the same habitats — attics, crawlspaces, barns, and wooded residential lots.

Adult size range: 3.5 to 7 feet, averaging 4–6 feet
Venomous: No

The North American racer (Coluber constrictor) — commonly called the black racer — is one of Nashville's most frequently encountered large snakes. Adults typically reach four to five feet, with larger individuals approaching six feet.

Racers are slender, fast-moving snakes that are active during the day. They're often spotted crossing roads, moving through yards, or fleeing rapidly when disturbed. Despite the name, racers are not true constrictors — they subdue prey by pinning it rather than coiling around it.

Black racers are non-venomous and harmless to humans, though they will bite defensively if handled. Their speed and dark coloration sometimes cause them to be mistaken for venomous species.

Adult size range: 3 to 6 feet, averaging 4–5 feet
Venomous: No

The Eastern kingsnake (Lampropeltis getula) is a robust, heavy-bodied snake that reaches three to four feet commonly, with larger individuals approaching five feet. Kingsnakes are notable for being immune to the venom of pit vipers — they actively prey on copperheads, cottonmouths, and rattlesnakes.

Having a kingsnake on your property is genuinely beneficial. They're non-venomous, docile toward humans, and actively suppress venomous snake populations. Their black body with white or yellow chain-link banding makes them fairly distinctive.

Adult size range: 3 to 5 feet, averaging 3.5–4 feet
Venomous: No

Nashville's three venomous species are all significantly smaller than the large non-venomous snakes above — but size is no indicator of danger. Venom potency has nothing to do with body length.

The copperhead (Agkistrodon contortrix) is the most commonly encountered venomous snake in the Nashville area. Adults typically reach two to three feet, with larger individuals approaching four feet. They're heavy-bodied for their length, which makes them look more substantial than a measurement alone suggests.

Copperheads are responsible for the majority of venomous snakebites in Tennessee. Their hourglass banding pattern and copper-colored head make them identifiable, but their camouflage is exceptional — they're extremely easy to overlook against leaf litter and debris.

Adult size range: 2 to 4 feet, averaging 2.5–3 feet
Venomous: Yes — seek immediate medical attention if bitten

The cottonmouth (Agkistrodon piscivorus) is a semi-aquatic pit viper found near Nashville's rivers, lakes, and wetlands. Adults commonly reach three to four feet, with larger individuals documented at four and a half feet. They're heavy-bodied snakes — a four-foot cottonmouth is a substantial animal.

Cottonmouths are the only venomous semi-aquatic snake in North America. They're found along the Cumberland River, Old Hickory Lake, Percy Priest Lake, and the creek systems throughout the metro area.

Adult size range: 2.5 to 4.5 feet, averaging 3–3.5 feet
Venomous: Yes — seek immediate medical attention if bitten

The timber rattlesnake (Crotalus horridus) is the largest venomous snake in Tennessee and one of the most medically significant. Adults typically reach three and a half to four and a half feet, with large individuals documented at five feet. They're very heavy-bodied snakes — a large timber rattlesnake is an impressive and dangerous animal.

Timber rattlesnakes are a protected species in Tennessee. It is illegal to kill, harm, or possess one without a permit. They're found in the wooded corridors and forested ridges around Nashville, including areas near Franklin, Brentwood, Hendersonville, and Murfreesboro.

Adult size range: 3 to 5 feet, averaging 3.5–4.5 feet
Venomous: Yes — seek immediate medical attention if bitten

The most important takeaway from this breakdown: the largest snakes in Nashville are non-venomous, and the venomous species are all on the smaller end of the size spectrum. A ten-foot black rat snake is startling but harmless. A two-and-a-half-foot copperhead is a genuine medical emergency.

When you encounter a snake, resist the instinct to judge danger by size. Focus on identification — head shape, banding pattern, body proportions, and behavior — or simply keep your distance and call a professional.

If you've found a snake on your property and aren't sure what it is, Nashville Snake Removal offers a 24-hour snake ID hotline. Call (615) 613-5992 any time — we'll help you identify what you're dealing with and respond if removal is needed.