Are There Cottonmouths in North Dakota?
No, cottonmouths are not found in North Dakota. These venomous snakes occur only in the warm southeastern United States and cannot survive North Dakota's harsh winters and plains climate. The state's northern location and cold temperatures make it completely unsuitable for this species. Residents and visitors to North Dakota do not need to worry about encountering cottonmouths.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Northern Cottonmouth · kirk gardner CC BY
Northern Cottonmouth · Mila Turov CC BY
Northern Cottonmouth · Joshua Liverman CC BY
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- GBIF records
Cottonmouths aren't established in North Dakota, so you might be wondering:
Real sighting data, source iNaturalist
Only 0 verified observations on iNaturalist of cottonmouth have been logged in North Dakota, which fits how rare they are in the state. That low number is itself the most honest answer to whether you are likely to see one here.
No, cottonmouths are not found in North Dakota. These venomous snakes occur only in the warm southeastern United States and cannot survive North Dakota's harsh winters and plains climate. The state's northern location and cold temperatures make it completely unsuitable for this species. Residents and visitors to North Dakota do not need to worry about encountering cottonmouths.
Are they in North Dakota?
Cottonmouths do not occur in North Dakota and have never established populations here. These snakes require warm climates with permanent water sources and cannot survive North Dakota's extreme winters. Temperatures in North Dakota drop far below the coldest temperatures cottonmouths can tolerate. Cottonmouths are found exclusively in the southeastern United States, from North Carolina south and west through warm coastal and river states. The nearest cottonmouth populations to North Dakota are in southern states like Arkansas, Mississippi, and Louisiana, more than 1,500 miles away. North Dakota's position in the far northern Great Plains and its subarctic winters make the state unsuitable for this species. Any snake found in water in North Dakota will be one of the state's native species.Wildlife guidesfor North Dakota describe the snakes that actually live there. North Dakota has a limited snake fauna suited to cold climates.
How dangerous is it?
While cottonmouths are venomous where they occur in southern states, they are not a concern in North Dakota. Since this species does not occur here, there is no risk of being bitten by one. The venom is adapted for hunting small fish, frogs, and aquatic prey in warm swamps and marshes. In states where cottonmouths do live, bites are rare because the snakes prefer to flee from humans. Most bites occur when people accidentally step on a snake or attempt to handle it. With prompt medical treatment, outcomes are almost always positive. North Dakota residents can enjoy the state's prairies, lakes, and river systems without any concern about cottonmouth bites. For more on cottonmouth in North Dakota, see ourNorth Dakota cottonmouth guide.
How to recognize one
Cottonmouths are medium-sized, stout snakes, typically 24 to 48 inches long, with a broad, triangular head and thick body. The name refers to the distinctive pale white or pink interior of the mouth, which they display when threatened as a warning. Coloration ranges from dark brown to olive to nearly black, with some individuals showing lighter bands or hourglass patterns. Younger snakes are typically more brightly patterned than adults. The heat-sensing pits along the jaw are characteristic. Since cottonmouths do not occur in North Dakota, residents will not encounter this species. Learning to identify North Dakota's actual native snakes is more practical. Understanding the snakes that do live in the state helps you feel confident when exploring natural areas. You can also browseNorth Dakota wildlife.
What to do if you are bitten or stung
This situation does not apply in North Dakota. Since cottonmouths are not found in the state, there is no risk of being bitten by one. If bitten by any snake in North Dakota, remain calm and seek medical attention. Remove any tight rings or jewelry from the bitten area. Wash the bite with soap and water. This is general information, not medical advice; if you are bitten, call Poison Control at 1-800-222-1222, or 911 if symptoms are severe. North Dakota's native snakes are nonvenomous. The state has limited snake diversity due to its harsh climate. Medical professionals can provide appropriate care. For questions aboutNorth Dakota wildlife, contact the North Dakota Game and Fish Department.
How to prevent encounters
Preventing snake encounters in North Dakota involves awareness of the limited native snake fauna. Wear closed-toe boots and long pants when hiking through grasslands and near water. Shake out sleeping bags and check shoes before putting them on when camping. Avoid reaching into spaces you cannot see, such as beneath rocks or logs. Wear gloves when handling firewood or clearing vegetation. Make noise while hiking so any snakes in the area hear you coming and retreat. Most snakes prefer to avoid humans and will leave if given the opportunity. Stay on marked trails and be aware of your surroundings. Do not attempt to handle any snake. Respecting wildlife ensures safe coexistence.Cottonmouth in North Dakotainformation is provided for educational purposes, but the actual risk in North Dakota is zero.
Where in North Dakota and when
Cottonmouths do not occur anywhere in North Dakota. This species is restricted to the warm southeastern United States, primarily in coastal plains, swamps, marshes, and river systems in Louisiana, Florida, Georgia, South Carolina, North Carolina, and eastern Texas. In those southern states where they do occur, cottonmouths are most active from April through October, with peak activity during summer months when temperatures are high. They are semi-aquatic and spend much time in or near water. During winter in southern regions, they reduce activity and shelter in protected locations. North Dakota's winters, with temperatures dropping to well below zero Fahrenheit and snow cover lasting months, would be lethal to this species. The state's climate is completely unsuitable for cottonmouths year-round. North Dakota's native wildlife is adapted to cold and grassland habitats.
Harmless lookalikes
North Dakota has limited native snakes due to its harsh climate. The common garter snake is the most widespread, found in grasslands and near water. The western hognose snake is found in prairie regions and can flatten its head when threatened, sometimes mistaken for a dangerous snake. The bull snake is a large, strong nonvenomous snake. The smooth green snake is small and graceful. None of these species are cottonmouths or venomous. If you find a snake in or near water in North Dakota, it is certainly a harmless native species. North Dakota's limited snake fauna means most residents will rarely encounter snakes, and when they do, they are harmless native species adapted to prairie and plains environments.
Frequently Asked Questions
Are Cottonmouths deadly? Cottonmouths are venomous in southern states, but deaths are rare with prompt medical care. Are Cottonmouth bites common in North Dakota? There have been no Cottonmouth bites in North Dakota because the species does not occur here. What venomous snakes are found in North Dakota? North Dakota has no venomous snakes; all native snakes are harmless. What should I do if I find a snake? Back away slowly and leave it alone; all native North Dakota snakes are harmless. For more information aboutNorth Dakota wildlife, contact the North Dakota Game and Fish Department or visit local nature centers.
Plan your cottonmouth sighting in North Dakota
There are no verified cottonmouth records for North Dakota, which fits how uncommon they are here. See the GBIF records.
Where to look in North Dakota
- Knife River Indian Villages National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- North Country National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Theodore Roosevelt National Park · Wildlife Watching, Birdwatching · Find hotels
- Fort Union Trading Post National Historic Site · Find hotels
Frequently asked questions
Are they in North Dakota?+
Cottonmouths do not occur in North Dakota and have never established populations here. These snakes require warm climates with permanent water sources and cannot survive North Dakota's extreme winters. Temperatures in North Dakota drop far below the coldest temperatures cottonmouths can tolerate. Cottonmouths are found exclusively in the southeastern United States, from North Carolina south and west through warm coastal and river states. The nearest cottonmouth populations to North Dakota are in southern states like Arkansas, Mississippi, and Louisiana, more than 1,500 miles away. North Dakota's position in the far northern Great Plains and its subarctic winters make the state unsuitable for this species. Any snake found in water in North Dakota will be one of the state's native species.Wildlife guidesfor North Dakota describe the snakes that actually live there. North Dakota has a limited snake fauna suited to cold climates.
How dangerous is it?+
While cottonmouths are venomous where they occur in southern states, they are not a concern in North Dakota. Since this species does not occur here, there is no risk of being bitten by one. The venom is adapted for hunting small fish, frogs, and aquatic prey in warm swamps and marshes. In states where cottonmouths do live, bites are rare because the snakes prefer to flee from humans. Most bites occur when people accidentally step on a snake or attempt to handle it. With prompt medical treatment, outcomes are almost always positive. North Dakota residents can enjoy the state's prairies, lakes, and river systems without any concern about cottonmouth bites. For more on cottonmouth in North Dakota, see ourNorth Dakota cottonmouth guide.
More wildlife in North Dakota