The 4 Venomous Snakes of Tennessee: A Complete Guide

Tennessee is home to 34 snake species, and the vast majority of them are completely harmless. But four species are venomous, and all four are present in Middle Tennessee. Knowing how to identify each one — and understanding their habits and habitats — is essential for anyone spending time outdoors or living near natural areas in the Nashville region.

Risk Level: Moderate — Most Common Venomous Snake in Tennessee

The copperhead is by far the most frequently encountered venomous snake in Middle Tennessee. It's responsible for the majority of venomous snakebites in the state, not because it's particularly aggressive, but because it's abundant, well-camouflaged, and often found near human habitation.

• Pattern: Distinctive hourglass-shaped crossbands — wider on the sides, narrowing to a pinch point at the spine
• Color: Chestnut to reddish-brown bands on a tan or pinkish-tan background
• Head: Solid copper or penny-brown, triangular, noticeably wider than the neck
• Size: 24–36 inches; stocky build
• Juveniles: Identical to adults but with a bright yellow tail tip

Copperheads favor wooded hillsides, rocky outcroppings, and areas with abundant leaf litter. They're common near Radnor Lake, Percy Warner Park, and the wooded edges of suburban neighborhoods throughout Williamson, Davidson, and Brentwood areas.

Copperheads are ambush predators that rely on camouflage rather than flight. They often freeze when approached, which is why so many bites occur when someone accidentally steps on one. They are most active from April through October, with peak activity in spring and fall.

Risk Level: High — Aggressive When Threatened

The cottonmouth, also called the water moccasin, is Tennessee's only semi-aquatic venomous snake. It's found throughout the state wherever there is permanent water — rivers, lakes, ponds, swamps, and drainage ditches.

• Pattern: Dark brown to black with faint darker crossbands (often barely visible in adults)
• Color: Adults are often nearly solid dark brown or black
• Head: Broad, triangular, with a distinctive white or cream-colored mouth interior (the "cotton" in cottonmouth)
• Size: 30–48 inches; very heavy-bodied
• Behavior cue: When threatened, cottonmouths often coil and gape widely, displaying the white mouth interior

Cottonmouths are found along the Cumberland River, Old Hickory Lake, Percy Priest Lake, and their tributaries. They're common in wetland areas, flooded bottomlands, and slow-moving streams. Hendersonville, Old Hickory, and Hermitage residents near the lake shoreline should be particularly aware.

Unlike most snakes, cottonmouths often stand their ground rather than retreating. They are more defensive than aggressive, but their willingness to hold position makes encounters more dangerous. Never approach a dark, heavy-bodied snake near water.

Risk Level: High — Most Dangerous Snake in Tennessee

The timber rattlesnake is the largest venomous snake in Tennessee and delivers the most medically significant bite. Fortunately, it is less common in suburban areas than the copperhead and tends to avoid human activity.

• Pattern: Dark brown or black crossbands on a gray, yellow, or brown background; some individuals are nearly solid black
• Head: Large, triangular, with heat-sensing pits between the eye and nostril
• Rattle: Segmented rattle at the tail tip — though juveniles may have only a small button
• Size: 36–60 inches; very heavy-bodied
• Color phases: Yellow phase (lighter background) and dark/black phase both occur in Tennessee

Timber rattlesnakes prefer undisturbed forested areas, rocky hillsides, and ridge tops. They're more common in the rural counties surrounding Nashville — Robertson, Stewart, Dickson, and Wilson counties — than in the urban core. They use the same den sites for generations.

Timber rattlesnakes are generally reluctant to rattle or strike unless directly threatened. They rely heavily on camouflage and will often remain motionless when approached. The rattle is a warning — if you hear it, back away slowly.

Risk Level: Low to Moderate — Small but Venomous

The pygmy rattlesnake is the smallest venomous snake in Tennessee and the least likely to cause a life-threatening bite due to its small venom yield. However, its bite is still medically significant and extremely painful.

• Pattern: Gray with reddish-brown blotches along the back and smaller spots on the sides
• Color: Gray to light brown background
• Head: Triangular, with a reddish-brown stripe running from the eye to the jaw
• Rattle: Tiny — often sounds more like a buzzing insect than a traditional rattle
• Size: 15–24 inches; slender for a rattlesnake

Pygmy rattlesnakes favor open pine forests, rocky hillsides, and areas near wetlands. They're less common in the Nashville metro area but present in the surrounding rural counties, particularly in areas with sandy or rocky soils.

Pygmy rattlesnakes are quick to rattle and strike when disturbed. Their small size and cryptic coloration make them easy to overlook. The tiny rattle is often mistaken for an insect sound.

Regardless of species, follow these rules if you encounter a venomous snake:

1. Do not approach, handle, or attempt to kill it. Most bites happen during these attempts.
2. Back away slowly and give the snake space to move away on its own.
3. Keep children and pets away from the area.
4. Call a professional if the snake is on your property and poses a risk.

If bitten, call 911 immediately. Keep the affected limb below heart level, remove tight clothing or jewelry near the bite, and get to an emergency room as quickly as possible. Do not apply a tourniquet, cut the wound, or attempt to suck out venom.

If you've found a venomous snake on your property — or a snake you can't positively identify — don't take chances. Our team is trained in venomous snake removal and responds 24/7 across Nashville and surrounding counties.

Call (615) 613-5992 for immediate assistance.