Are King Snakes Poisonous?

King snakes are among the most popular pet snakes in the United States, and they are also commonly encountered in the wild across much of North America. If you have spotted one in your yard or are thinking about getting one as a pet, one of the first things you want to know is whether they are dangerous. The answer is a reassuring no.

King Snakes Are Not Venomous or Poisonous

King snakes are completely non venomous and non poisonous. They do not produce venom, they do not have venom glands, and they do not have the hollow or grooved fangs that venomous snakes use to deliver toxins. They are constrictors that subdue their prey by wrapping around it and squeezing, the same basic method used by boas and pythons.

To be technically accurate, king snakes are not poisonous either. Remember that “poisonous” refers to something that is harmful when ingested or touched, while “venomous” refers to something that injects toxins through a bite or sting. King snakes are neither. They are harmless to humans in every practical sense.

Why King Snakes Get Confused with Venomous Species

One reason people worry about king snakes being venomous is that some species look remarkably similar to venomous coral snakes. The scarlet king snake and the milk snake both have red, black, and yellow or white banding patterns that closely resemble the coral snake. This mimicry is a survival strategy called Batesian mimicry, where a harmless species evolves to look like a dangerous one to scare off predators.

The traditional rhyme “red touches yellow, kill a fellow; red touches black, friend of Jack” is sometimes used to distinguish coral snakes from king snakes. In coral snakes, the red bands touch the yellow bands, while in king snakes, the red bands touch the black bands. However, this rhyme only applies reliably to North American species and should not be used as your sole method of identification. If you are unsure whether a snake is a king snake or a coral snake, leave it alone and observe from a safe distance.

What Happens If a King Snake Bites You

A king snake bite is not a medical emergency. Their teeth are small, and while a bite may draw a tiny amount of blood, it is comparable to a minor scratch. Baby king snakes may bite more frequently than adults as a defensive behavior, but their bites are so small that you barely feel them.

If a king snake bites you, simply wash the area with soap and water and apply a basic antiseptic. That is all the treatment needed. There is no venom to worry about and no risk of envenomation. The only potential concern, as with any minor wound, is infection if the bite is not kept clean.

Captive bred king snakes that are handled regularly rarely bite at all as adults. Most biting from king snakes is either a defensive reaction from a scared juvenile or a feeding response, where the snake mistakes your warm hand for food. Using feeding tongs during feeding time virtually eliminates accidental bites.

King Snakes Are Actually Beneficial

Not only are king snakes harmless to humans, they are actually one of the most beneficial snakes you can have around your property. King snakes eat other snakes, including venomous species like rattlesnakes, copperheads, and cottonmouths. They have a natural immunity to pit viper venom, which allows them to prey on these dangerous species without being harmed.

A king snake in your yard is essentially a free pest control service. In addition to eating venomous snakes, they also consume rodents, lizards, and birds’ eggs. Having a king snake around actually reduces your chances of encountering a venomous snake, which is a pretty compelling reason to leave them alone if you find one on your property.