Are Garter Snakes Poisonous?

Garter snakes are one of the most common snakes in North America, and if you have ever spent time outdoors, you have probably seen one slithering through the grass. A lot of people want to know if these familiar snakes are dangerous, and the answer involves an interesting distinction between “poisonous” and “venomous” that most people get mixed up.

Poisonous vs. Venomous: What Is the Difference?

Before we talk about garter snakes specifically, it helps to clear up a common misconception. Poisonous and venomous are not the same thing, even though most people use them interchangeably. A poisonous animal is one that is harmful when you eat or touch it. Think of poison dart frogs or certain mushrooms. A venomous animal is one that injects toxins through a bite or sting, like a rattlesnake or a bee.

So technically, the question should be “are garter snakes venomous?” And the answer is actually more complicated than you might expect.

Are Garter Snakes Venomous?

For a long time, garter snakes were classified as completely non venomous. However, research over the past few decades has revealed that garter snakes do actually produce a mild venom. They have small, rear facing teeth (called rear fangs or enlarged posterior teeth) that can deliver this venom when they chew on prey. So yes, garter snakes are technically venomous.

Before you panic, here is the important context: garter snake venom is extremely mild and poses virtually no threat to humans. It is designed to subdue small prey like frogs, worms, and fish, not to defend against large predators. The venom is not injected through hollow fangs like a rattlesnake. Instead, it seeps from the rear teeth during prolonged chewing, which is effective on a tiny frog but essentially harmless to a human.

What Happens If a Garter Snake Bites You?

If a garter snake bites you, the most likely outcome is a minor scratch that barely breaks the skin. Garter snakes are small, and their teeth are tiny. Most bites feel like a gentle pinch and cause minimal bleeding. The bite itself is about as significant as a paper cut.

In rare cases, a person who is bitten by a garter snake and experiences prolonged chewing (which is unlikely since most defensive bites are quick strike and release) might notice some mild swelling or itching around the bite area. This is more likely an allergic reaction to the saliva than a significant envenomation. These symptoms typically resolve on their own within a day or two.

Standard first aid for a garter snake bite is simple: wash the area with soap and water, apply an antiseptic, and keep it clean. That is it. There is no need for medical treatment unless you notice signs of infection (increasing redness, swelling, or warmth around the bite) in the following days, which can happen with any minor wound, not just snake bites.

Are Garter Snakes Safe as Pets?

Garter snakes make excellent pets and are completely safe to handle. Their mild temperament, small size, and low maintenance care requirements make them a popular choice for beginners and experienced keepers alike. Most garter snakes become quite tame with regular handling and rarely bite once they are accustomed to their owner.

One of the best things about garter snakes as pets is their diet. Unlike most popular pet snakes that eat rodents, garter snakes thrive on a diet of fish and earthworms, which many people find much easier to handle than feeding mice. They are also one of the few snake species that can be housed communally, though individual housing is still preferred by many keepers.

Are Any Garter Snakes Actually Dangerous?

No garter snake species is dangerous to humans. There are over 35 species of garter snakes across North and Central America, and none of them pose a meaningful threat to people. Even the largest garter snakes (common garter snakes can reach 4 feet, though most are smaller) cannot cause significant harm with a bite.

However, it is worth mentioning that some garter snake species, particularly the common garter snake (Thamnophis sirtalis), can be somewhat toxic to eat. Their bodies accumulate toxins from the prey they consume, particularly from eating toxic newts and toads. This makes them mildly poisonous (in the true sense of the word) to predators that try to eat them. But since you are presumably not planning to eat a garter snake, this is not a concern for snake owners or people who encounter them in the wild.