Copperhead vs Corn Snake: Key Differences and ID Tips

Key differences at a glance

The copperhead (Agkistrodon contortrix) is a venomous pit viper of the eastern and central United States. The corn snake (Pantherophis guttatus) is a harmless, slender rat snake of the Southeast that kills its prey by constriction. Both can be orange, tan or reddish brown, both live in woods and fields, and both turn up around barns, sheds and woodpiles, which is why they are so often confused.

Harmless corn snakes are often killed because people mistake them for copperheads. Learning a few clear differences makes the two easy to separate, ideally from a distance of at least a couple of meters and without ever handling the snake.

Pattern: hourglass bands vs blotches

This is the most useful single difference.

Copperhead: the body is crossed by 10 to 18 dark chestnut bands on a lighter tan, pinkish or coppery background. Each band is wide at the sides and narrow over the backbone. Seen from above, it looks like an hourglass or a bow tie; seen from the side, like a rounded triangle or a chocolate kiss. The bands are soft-edged and earthy, with no black borders.

Corn snake: the back carries a row of large red, orange or brown blotches, each outlined in black, on an orange, tan or grayish background. The blotches are saddle-shaped or roughly square and do not widen toward the belly. Smaller blotches run along the sides. The black outlines give corn snakes a crisp, almost painted look.

Head shape, eyes and pits

The copperhead has a broad, triangular head that is clearly wider than its neck. The top of the head is an unmarked copper or orange-tan, with a faint dark line behind each eye. Up close, it has vertical, cat-like pupils and a heat-sensing pit on each side of the face between the eye and nostril, a feature it shares with rattlesnakes and cottonmouths. Learn how those pits work in how do pit vipers sense heat?

The corn snake has a narrower head that is only slightly wider than its neck. It carries a distinctive pattern: a spearpoint-shaped mark on the crown and a dark stripe running from the eye back toward the jaw. Its pupils are round, and it has no facial pits.

Head shape alone is not reliable, because many harmless snakes flatten their heads when frightened, and pupils and pits can only be seen at close range. Use pattern and overall build first.

Belly and body shape

Flip-side clues help in photographs. The corn snake’s belly is a bold black-and-white checkerboard, one of the explanations offered for its name, because it resembles the kernels on an ear of multicolored corn. The copperhead’s belly is cream to pinkish, with darker smudges along the edges.

Body shape is a good field clue. Copperheads are thick and heavy for their length, while corn snakes are slender and agile, with a smooth, even taper. Most adult copperheads are 50 to 95 cm (20 to 37 in) long; most adult corn snakes are 60 to 120 cm (2 to 4 ft), with a record of about 183 cm (6 ft). A long, thin orange snake climbing a wall or tree is far more likely to be a corn snake.

Behavior and habits

The two snakes also behave differently. A copperhead relies on camouflage: it usually stays still in leaf litter and waits in ambush for mice, frogs, lizards and cicadas, then strikes and injects venom. When disturbed, it often freezes rather than fleeing.

A corn snake is an active forager. It hunts mainly rodents, along with lizards, frogs and birds’ eggs, searching rodent burrows and climbing into trees, bushes and buildings. It seizes prey with its jaws and kills it by constriction, squeezing in coils. Corn snakes are mostly active at night or at dusk and dawn. Both species may vibrate their tails when threatened, which can make a buzzing sound in dry leaves, so tail-rattling is not a reliable clue.

Babies: live young vs eggs

Copperheads give birth to live young, usually 4 to 8 at a time, in late summer and early fall. Newborns are about 20 cm (8 in) long and have a bright yellow or greenish tail tip. Corn snakes lay a clutch of about 12 to 24 eggs in early summer, in rotting logs or other warm, damp spots, and the hatchlings emerge after about 10 weeks.

Young corn snakes are much duller than adults, often gray or brown with darker blotches, so they are the ones most often mistaken for baby copperheads. They lack the yellow tail tip and still have the round pupils, slender build and checkered belly. Learn more in what do baby copperheads look like?

Which is more dangerous?

Only the copperhead is dangerous. It is venomous and causes more venomous snakebites than any other US snake, though deaths are extremely rare. If anyone is bitten by a snake that might be a copperhead, seek emergency medical help immediately or call 911.

The corn snake is nonvenomous. Like other American rat snakes, it descends from venomous ancestors but long ago lost functional venom after evolving constriction. A frightened corn snake may bite or release musk, but it poses no venom risk. Read more in are corn snakes venomous?

Where they overlap

The ranges overlap broadly in the Southeast. The corn snake lives from southern New Jersey and Virginia south through the Carolinas and Georgia to the Florida Keys and west to Louisiana and Tennessee. The copperhead ranges farther north and west, from southern New England to eastern Kansas and Texas, but is absent from peninsular Florida. In northern Florida, Georgia, the Carolinas, Virginia, Alabama, Mississippi and Tennessee, either snake could turn up in the same woods or backyard.

Both are classed as Least Concern by the IUCN. Both also help control rodents, so the best response to either is the same: keep your distance, keep children and pets away and let the snake move on.

Can they interbreed?

No. The copperhead belongs to the viper family, Viperidae, and the corn snake to the colubrid family, Colubridae. Their lineages split tens of millions of years ago, and they reproduce in different ways, one giving birth to live young and the other laying eggs. Corn snakes can hybridize with closely related rat snakes and kingsnakes, but never with a copperhead.