Are There Copperheads in Washington?
No, copperheads are not found in Washington state. They live in the eastern and central United States and do not occur west of the Mississippi River. Washington's cool, wet climate and different snake species mean you will not encounter a copperhead here. If you find a snake in Washington, it is almost certainly a harmless native species.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Eastern Copperhead · Court Harding CC BY
Eastern Copperhead · Mila C. CC BY
Eastern Copperhead · Alan Rockefeller CC BY
- 1
- GBIF records
Copperheads aren't established in Washington, so you might be wondering:
Real sighting data, source iNaturalist
Only 0 verified observations on iNaturalist of copperhead have been logged in Washington, 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, copperheads are not found in Washington state. They live in the eastern and central United States and do not occur west of the Mississippi River. Washington's cool, wet climate and different snake species mean you will not encounter a copperhead here. If you find a snake in Washington, it is almost certainly a harmless native species.
Are They in Washington?
Copperheads are not established in Washington state and have no recorded occurrence west of the Mississippi River. This venomous snake is a resident of the eastern and central United States, where it thrives in warmer, drier climates than Washington offers. The Cascade Range and coastal mountains create a climate too cold and wet for copperheads to survive year-round. Their range extends from the Gulf Coast states northward through the Appalachian region and the Ohio Valley, but it stops well short of the Pacific Northwest. Washington's native venomous snake is the northern Pacific rattlesnake, found only in the central and eastern portions of the state. TheCopperhead in Washingtonpage confirms this absence. You can safely assume that any snake you encounter in Washington is not a copperhead.
How Dangerous Is It?
Although you will not encounter a copperhead in Washington, it is helpful to know that copperhead bites are rarely fatal in healthy adults with access to medical care. A copperhead bite causes local pain and swelling where the venom is injected, but systemic effects are uncommon. Fewer than 5 percent of copperhead bites result in serious complications, and deaths are extremely rare. The venom is not designed to kill large animals but to subdue small prey like rodents. Most copperhead bites occur when someone attempts to handle, kill, or capture the snake rather than during accidental encounters. Children, elderly people, and people with compromised immune systems may experience more severe reactions. This information is useful if you travel to copperhead country in the eastern United States.
How to Recognize One
If you encounter a copperhead in the eastern states, look for a medium-sized snake, usually 2 to 3 feet long, with distinctive hourglass or butterfly-shaped markings on the back. These bands are reddish-brown or tan and are wider at the sides than at the center of the back. The head is often a distinctive copper color. Copperheads have vertical elliptical pupils like cats. They prefer leaf litter, rock piles, and woodpiles during the day and hunt near the ground at night. In the East, they are common near streams and swamps but also venture into gardens and yards. Washington's native snakes, like garter snakes and rat snakes, have different patterns and behaviors.Washington wildlifepages describe the snakes you will actually encounter in the state.
What to Do If Bitten
Since copperheads do not live in Washington, you need not worry about encountering one here. However, if you travel to copperhead habitat in the eastern United States and are bitten by any snake, the first response is to stay calm. Remove yourself from the area where the snake is located and keep the bitten area still and below heart level if possible. Remove rings, bracelets, and tight clothing from the bitten limb before swelling occurs. Wash the bite gently with soap and water if running water is available. Seek medical attention as soon as possible by going to an emergency room or calling 911. 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. Do not apply ice, tourniquets, or attempt field treatment.
How to Prevent Encounters
Preventing copperhead encounters is not necessary in Washington since they do not live here. However, if you travel to copperhead habitat in the eastern United States, the same prevention steps apply as for any venomous snake. Wear long pants and closed-toe hiking boots when walking through fields, marshes, or rocky areas. Stay on marked trails and avoid pushing through dense brush where you cannot see where your feet will land. Clear leaf litter, woodpiles, and brush from around your home if you live in copperhead country. When sitting outdoors in warm weather, stay alert and scan the area around you. Wear gloves when moving wood or working in areas where snakes may hide. Most snake bites occur when someone tries to handle or kill the animal. Simply leaving snakes alone is the best prevention strategy.
Where in Washington and When
Copperheads do not occur anywhere in Washington state. They are absent from the Puget Sound region, the Olympic Mountains, the Cascade Range, the Blue Mountains, and the Columbia Plateau. Their eastern range includes the Appalachian Mountains, the Ohio Valley, the Mississippi River basin, and the southeastern United States. Copperheads are active from April through October in the eastern states, with peak activity in May and September. They are most active during warm nights and on overcast days. In winter, eastern copperheads den in rock crevices, abandoned animal burrows, and hollow trees. If you live in Washington and are interested in understanding the actual venomous snakes that do occur here,wildlife in Washingtonprovides detailed information on the northern Pacific rattlesnake and other native reptiles.
Harmless Lookalikes
Since copperheads do not live in Washington, there are no local copperhead lookalikes to worry about. Any snake you encounter in Washington is a harmless native species. Washington is home to garter snakes, rat snakes, gopher snakes, rubber boas, and grass snakes, all of which are nonvenomous. The only venomous snake in Washington is the northern Pacific rattlesnake, which is found only in the central and eastern portions of the state in dry, rocky areas. The rattlesnake's rattle is an unmistakable warning and a clear way to distinguish it from harmless species. All other Washington snakes lack venom and pose no medical threat. If you find a snake in Washington and it has a rattle at the end of its tail, it is a rattlesnake. Checkmore on Copperhead in Washingtonto confirm that copperheads truly do not occur in your region.
Frequently Asked Questions
Are there copperheads in Washington? No, copperheads do not live in Washington state or anywhere in the Pacific Northwest. Do copperheads live west of the Mississippi River? No, copperheads do not occur anywhere west of the Mississippi River. Their range is entirely in the eastern and central United States. What venomous snakes live in Washington? The northern Pacific rattlesnake is the only venomous snake in Washington state and is found only in the central and eastern regions. What should I do if I see a snake in Washington? Leave it alone. All Washington snakes except the northern Pacific rattlesnake are completely harmless. If you encounter a rattlesnake, back away slowly and give it room to escape. SeeWashington wildlife guidefor more information about the snakes that actually live here.
Plan your copperhead sighting in Washington
1 verified copperhead records have been logged in Washington, most recently in 2015. See the GBIF records.
Where to look in Washington
- Ebey's Landing National Historical Reserve · Wildlife Watching, Birdwatching · Find hotels
- Fort Vancouver National Historic Site · Wildlife Watching · Find hotels
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- Lewis and Clark National Historical Park · Wildlife Watching, Birdwatching · Find hotels
- Mount Rainier National Park · Wildlife Watching, Birdwatching · Find hotels
- Nez Perce National Historical Park · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
Are They in Washington?+
Copperheads are not established in Washington state and have no recorded occurrence west of the Mississippi River. This venomous snake is a resident of the eastern and central United States, where it thrives in warmer, drier climates than Washington offers. The Cascade Range and coastal mountains create a climate too cold and wet for copperheads to survive year-round. Their range extends from the Gulf Coast states northward through the Appalachian region and the Ohio Valley, but it stops well short of the Pacific Northwest. Washington's native venomous snake is the northern Pacific rattlesnake, found only in the central and eastern portions of the state. TheCopperhead in Washingtonpage confirms this absence. You can safely assume that any snake you encounter in Washington is not a copperhead.
How Dangerous Is It?+
Although you will not encounter a copperhead in Washington, it is helpful to know that copperhead bites are rarely fatal in healthy adults with access to medical care. A copperhead bite causes local pain and swelling where the venom is injected, but systemic effects are uncommon. Fewer than 5 percent of copperhead bites result in serious complications, and deaths are extremely rare. The venom is not designed to kill large animals but to subdue small prey like rodents. Most copperhead bites occur when someone attempts to handle, kill, or capture the snake rather than during accidental encounters. Children, elderly people, and people with compromised immune systems may experience more severe reactions. This information is useful if you travel to copperhead country in the eastern United States.
More wildlife in Washington