There’s a snake in my yard. Is it venomous?
The short answer
Statistically, no. Tennessee has 32 native snake species and only four of them are venomous. And it does not actually matter, because the correct response is identical either way: back away and leave it alone. A snake you are not standing next to cannot bite you.
It is also, as a general matter, illegal to kill snakes in Tennessee. All native snakes are protected as nongame wildlife under state law, venomous ones included.
The four
Tennessee's venomous species are the copperhead, the cottonmouth, the timber rattlesnake, and the pygmy rattlesnake.
Ranges vary across the state, and that matters here. In a West Tennessee suburban yard, the copperhead is the one you are most likely to meet, and even that is uncommon. The cottonmouth is the one to know about near water — TWRA calls it relatively common in the aquatic habitats of West Tennessee — so a snake at the edge of a creek, wetland or river bottom deserves more distance than a snake on your driveway. The pygmy rattlesnake does not occur this far west. The timber rattlesnake is a woodland animal, not a lawn animal.
Everything else you see is non-venomous, and a good number of those are actively useful to have around. Rat snakes and kingsnakes eat rodents, and kingsnakes eat other snakes, including venomous ones.
The ID rules you have heard are not reliable
This is the part that gets people hurt, because the folk rules feel authoritative and fail in exactly the situations where you are using them.
Triangular head. Many harmless snakes flatten their heads into a triangle when threatened. It is a bluff, and it is a good one.
Cat-eye pupils. You cannot see a snake's pupil from a safe distance, and if you are close enough to check, you are close enough to be bitten.
Rhymes about red and yellow bands. These apply to coral snakes, which are not found in Tennessee, and people misapply them constantly.
Rattling. Several non-venomous snakes vibrate their tails in dry leaves and sound convincingly like a rattlesnake.
Swimming on top of the water. Widely repeated, not dependable.
Reliable identification takes experience and a clear photo. If you want to know what you saw, take a picture from a distance and ask someone who does this — not a stranger in a Facebook comment section, where confidently wrong answers are the norm.
What to do
Stop moving. Give it space. About a third of bites happen when someone tries to kill, catch or move a snake — and that third is the part you have complete control over.
Bring pets and children inside.
Let it leave. It is passing through, and it wants to be near you even less than you want to be near it.
If it is somewhere it truly cannot stay — inside the house, in a garage you need to use — a licensed wildlife control operator can remove it. A broom and an open door can also work, at a distance, if it is in a room with an exit and you are confident it is non-venomous. If you are not sure what it is, that is exactly the situation where you call someone instead.
If someone is bitten, get to an emergency room. Do not cut, do not suck, do not apply a tourniquet, do not ice it, and do not try to catch or kill the snake for identification — the hospital does not need it. Take off rings, watches and anything tight before swelling starts, keep the limb still, and go. Poison Help, 1-800-222-1222, can advise on the way.
Why killing them is both illegal and a bad trade
Tennessee protects all native snake species as nongame wildlife. Under state law, killing a snake is a "take" — the statute defines that to include harassing, hunting, capturing or killing — and a violation is generally a Class B misdemeanor, with additional exposure if the species is listed as threatened or endangered. Narrow exceptions exist for genuine emergencies threatening life or property, but "I saw a snake in my yard" is not one of them.
There is also a practical argument. A single rat snake removes a meaningful number of rodents from your property over a season. Rodents are what actually get into your walls, chew your wiring and carry disease into your house. Removing the snake does not remove the reason the snake was there.
On the safety side, the best available U.S. data suggests roughly a third of venomous snakebites happen while someone is deliberately handling, catching or attacking a snake. Most of the rest happen to people who never saw the snake at all — which is an argument for watching where you put your hands and feet, not for killing anything. Leaving it alone removes the one category of bite that is entirely avoidable.
Keeping them out of the yard
Cut the grass and clear brush piles, woodpiles and tall weeds near the house.
Deal with rodents. Snakes follow food.
Seal gaps around foundations, crawlspace vents and garage doors.
Move bird feeders away from the house — spilled seed brings rodents, and rodents bring snakes.
Who we are
Out of the Woods Wildlife Rescue & Rehab is a wildlife rehabilitation nonprofit in Memphis, permitted by the Tennessee Wildlife Resources Agency. Reptile permits differ from mammal permits and we cannot take every animal, but we would much rather you text us a photo than kill something harmless. 901-340-6534.
Sources: TWRA Snakes of Tennessee and individual species pages. Tennessee Nongame and Endangered or Threatened Wildlife Species Conservation Act. Wasko & Bullard, Wilderness & Environmental Medicine, on snakebite circumstances.
We are wildlife rehabilitators, not lawyers or doctors. This is general information, not legal or medical advice — TWRA is the authority on the law, and an emergency room is the authority on a bite.