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The Global Insight

What kind of poisonous snakes are in Pennsylvania

Author

Ava Hudson

Updated on March 25, 2026

The three species of venomous snakes in Pennsylvania are the timber rattlesnake, eastern massasauga and copperhead. Reports of venomous snakebites are rare in Pennsylvania. All three species are usually not aggressive and like to avoid humans by moving away or keeping still until the person is gone.

Where are poisonous snakes found in PA?

There are 21 species of snakes found in Pennsylvania and three of them — timber rattlesnakes, copperhead and the eastern massasauga — are venomous. The massasauga are only found in Venango, Butler and Mercer counties in Pennsylvania. They live in prairie type of wetlands that are found in these counties.

Are there venomous water snakes in Pennsylvania?

The three venomous species of snakes in Pennsylvania are the Eastern Copperhead, Timber Rattlesnake and Eastern Massasauga. Reports of venomous snakebites in Pennsylvania are rare.

What counties in PA have Copperheads?

PARS has found northern copperheads – the second most common venomous snake in Pennsylvania – in 5 of the counties without timber rattlesnakes: Allegheny, Armstrong, Bucks, Chester and Lancaster.

Where are copperhead snakes found?

Of the five copperhead subspecies, the northern copperhead has the greatest range. It is found in northern Georgia and Alabama, north to Massachusetts and west to Illinois. Copperheads live in a range of habitats, from terrestrial to semiaquatic, including rocky, forested hillsides and wetlands.

What's the difference between a copperhead and a cottonmouth?

Cottonmouth snakes are generally considered to have more potent venom. Copperheads are considered less venomous and there is some controversy as to whether or not bites from copperhead snakes need to be treated with antivenom. Copperhead and juvenile cottonmouth snakes are both brown in color.

What does a copperhead snake look like in Pennsylvania?

“Medium-sized, heavy bodied species. The background is pinkish brown, light tan to greyish brown with wide brown to reddish brown bands that become darker towards the margin. The bands are saddle shaped (hourglass) that are broader along the sides and become narrower across the dorsum.

Do copperhead snakes swim?

But copperheads, like northern water snakes, swim and can be found near water across the region. So, if a snake is not easily identifiable as a non-venomous water snake, it is best to beware. Northern water snakes can grow up to three feet long, and females are larger than males.

Are copperheads aggressive?

Copperheads are not aggressive, but they are territorial, and will strike in self-defense if they feel threatened. So if you see a copperhead, give it wide berth and leave it alone.

Are there king snakes in PA?

With the exception of two types of venomous snakes, Pennsylvania snakes consist of nineteen species of colubrid snakes, a family of snakes with familiar names such as ratsnakes, kingsnakes, garter snakes and watersnakes.

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How can you tell if a snake is venomous?

Venomous snakes typically have broad, triangular heads. This may sound odd because most snake heads look similar, but the difference in shape is seen near the snake’s jaw. A venomous snake will have a bulbous head with a skinny neck because of the position of the snake’s venom sacks underneath its jaw.

Are there brown snakes in Pennsylvania?

The northern brown snake (Storeria dekayi dekayi) is found across Pennsylvania in habitats ranging from forests to grasslands to vacant lots. It is an abundant species. The adult is 9-13 inches in length.

Which state has the most copperhead snakes?

States having the highest bite rates per million population per year are North Carolina, 157.8; West Virginia, 105.3; Arkansas, 92.9; Oklahoma, 61; Virginia, 48.7; and Texas, 44.2.

Can you smell a copperhead snake?

Copperhead snakes can smell like cucumbers. The Missouri Department of Conservation (MDC) says copperhead snakes can give off an odor that’s produced by glands at the base of the snake’s tail and can also be mixed with feces. “To some individuals this musk may smell somewhat like cucumbers,” they note.

How do you tell if a snake is a copperhead?

Copperheads have muscular, thick bodies and keeled (ridged) scales. Their heads are “somewhat triangular/arrow-shaped and distinct from the neck,” with a “somewhat distinct ridge separating [the] top of head from side snout between eye and nostril,” said Beane.

What to do if you see a copperhead?

If you have an encounter with a snake, give it the right-of-way. Do not attempt to kill the snake, just move out of the snake’s way. If you encounter a snake in the housing area or in your yard, call the police desk at 255-2222 and follow their instructions.

Are water moccasins venomous?

Description: Cottonmouths are venomous semi-aquatic snakes often referred to as “water moccasins.” They have large, triangular heads with a dark line through the eye, elliptical pupils, and large jowls due to the venom glands.

What do you do if you get bit by a copperhead snake?

Lay or sit the person down with the bite below the level of the heart. Tell him/her to stay calm and still. Wash the wound with warm soapy water immediately. Cover the bite with a clean, dry dressing.

Which bite is worse copperhead or Water Moccasin?

The cottonmouth (also known as the water moccasin) bite is much more dangerous and harmful to humans than the bite of the closely related copperhead, but rarely leads to death. The cottonmouth is more aggressive, but as with the copperhead, biting isn’t common unless the snake is actually touched.

Are Cottonmouths more aggressive than copperheads?

Copperhead bites usually don’t kill people but can prove fatal to smaller mammals such as dogs. Unlike cottonmouths, copperheads strike out at once if they perceive a threat. … Water moccasins are less aggressive, usually attacking only if provoked.

Which bite is worse copperhead or rattlesnake?

Bite severity Bites from timber rattlesnakes are usually more severe than bites from copperheads and are a medical emergency. Bite severity Bites from rattlesnakes are usually more severe than bites from copperheads and are a medical emergency.

Will a copperhead snake chase you?

“Many venomous species, including copperheads, rely on their camouflage to avoid conflict — so they don’t run away,” Steen said. Therefore, it’s true that many snakes won’t flee. However, “no snake will attack a human,” Beane said. “Most will retreat, given any reasonable chance.

How long do you have after a cottonmouth bite?

Patients presenting after a cottonmouth bite should undergo observation for eight hours post-envenomation. If there are no physical or hematologic signs within eight hours, then the patient can be discharged home.

Are copperheads good for anything?

Mitchell, author of “The Reptiles of Virginia,” offered another reason to let copperheads live: “They are great rodent eaters. They play a major role in controlling rodent populations.”

What animal eats copperheads?

Owls and hawks are the copperhead’s main predators, but opossums, raccoons and other snakes may also prey on copperheads.

Can a copperhead bite you in the water?

Snakes can bite you underwater, but usually only if they’re provoked or if they feel threatened. … Since bites were on their lower limbs, researchers concluded that they were bitten after stepping on a snake in the water. Regardless of whether the snake is venomous, it can still bite.

What time of day are copperhead snakes most active?

Copperheads are most active from the late afternoon into the evening, and prefer cooler areas to hide. They hibernate in the winter, and emerge in the spring for mating season. Their diet consists of small rodents and other pests, so if you have a rodent problem, your property can likely attract these serpents.

Where are water moccasins found?

Cottonmouths are native to the U.S. and range from southeastern Virginia to Florida, west to central Texas and north to southern Illinois and Indiana, according to the IUCN. They primarily live in aquatic and wetland habitats, including swamps, marshes, drainage ditches, ponds, lakes and streams.

Are ringneck snakes poisonous?

Individuals of this species are totally innocuous to people. However, they are indeed slightly venomous. Ringneck snakes’ saliva contains moderate venom, which they utilize to control their prey animals.

Is an Eastern milk snake poisonous?

The L t triangulum is often mistaken for the venomous copperhead snake, which is visually similar to the Eastern milk snakes. But, unlike the venomous species, the Eastern milksnake is totally non-venomous and safe for humans.

How can you tell a poisonous snake from a harmless one?

Venomous snakes have distinct heads. While non-venomous snakes have a rounded head, venomous snakes have a more triangular-shaped head. The shape of a venomous snake’s head may deter predators. However, some non-venomous snakes can mimic the triangular shape of non-venomous snakes by flattening their heads.