Are There Copperheads in Illinois?
Yes, copperheads live in southern Illinois, but they are quite limited in range within the state. They are found mainly in the southern counties near the Ohio River and Mississippi River valleys. Most of Illinois, particularly the northern regions, has no copperheads. Bites are very uncommon.
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
- species recorded
- 479
- GBIF records
- October, September, May
- peak months
Yes, copperheads are in Illinois. Next you'll want:
Real sighting data, source iNaturalist
410 verified observations on iNaturalist of copperhead have been recorded in Illinois, most often in October, September, May.
When copperhead are recorded in Illinois
Yes, copperheads live in southern Illinois, but they are quite limited in range within the state. They are found mainly in the southern counties near the Ohio River and Mississippi River valleys. Most of Illinois, particularly the northern regions, has no copperheads. Bites are very uncommon.
Are they in Illinois?
Copperheads are found in Illinois, but only in the southern part of the state. Their range is restricted primarily to the southern counties, particularly those bordering the Ohio River and along the Mississippi River valley. The counties south and west of the Wabash River and Ohio River contain established copperhead populations. Central and northern Illinois have no copperheads. Learn about Illinois wildlife to understand that copperheads are restricted to specific southern regions. The species reaches the northern edge of its range in southern Illinois, meaning they are less common here than in states farther south. Most Illinoisans, particularly those living in Chicago and central Illinois regions, will never encounter a copperhead. If you live or travel in northern or central Illinois, copperheads are not a concern for your outdoor activities. For more on copperhead in Illinois, see ourIllinois copperhead guide.
How dangerous is it?
A copperhead bite is painful and requires medical attention, but it is not typically life-threatening in healthy adults. Copperhead venom causes local swelling, discoloration, and tissue damage at the bite site. Systemic effects are rare. Deaths from copperhead bites are very uncommon in the United States, especially with prompt medical care. The bite should be treated by a doctor to prevent complications and manage pain, but most bites do not result in severe outcomes. Dry bites, where no venom is injected, occur in about one-third of copperhead bites. Children, elderly individuals, and people with compromised immune systems should receive extra caution and immediate medical evaluation. Given that copperheads are uncommon even in southern Illinois, actual bite incidents are extremely rare in the state. You can also browseIllinois wildlife.
How to recognize one
Copperheads are medium-sized snakes, typically 24 to 36 inches long, with distinctive hourglass-shaped markings on their reddish-brown or tan bodies. Their head is often a darker copper or bronze color, which gives them their name. Look for the characteristic pale X or hourglass bands running down their back. In Illinois, younger copperheads have bright yellow or greenish tails. Copperheads are highly cryptic and blend well with leaf litter, wood chips, and bare ground. They often stay motionless when threatened. They hide in woodpiles, leaf piles, rock outcrops, fallen logs, and thick brush near water. Learning to spot these markings helps you avoid them if you venture into southern Illinois woodlands. However, most of the state has no copperheads, so this concern applies mainly to southern counties. See all of ourwildlife guides.
What to do if you are bitten or stung
If bitten by a copperhead, remain calm and seek medical care immediately. Remove any rings, watches, or tight clothing from the bitten limb, as swelling will occur. Keep the bite area still and below heart level if possible. Do not attempt field treatment such as cutting the skin, applying tourniquets, sucking venom, or using ice packs. Do not apply salves or medications yourself. Get to a hospital or emergency clinic as soon as possible. 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. Medical professionals can administer antivenom if needed and manage pain and swelling. The sooner you receive care, the better the outcome. Given how rare copperhead bites are in Illinois, this is a precaution unlikely to be needed. OurIllinois wildlife guidecovers more species you may run into.
How to prevent encounters
If you spend time in southern Illinois counties where copperheads live, take basic precautions to avoid encounters. Wear closed-toe boots or shoes when walking in woodsy or brushy areas, especially in spring and summer. Watch where you place your hands when reaching into leaf piles, thick brush, or under rocks. Clear brush, leaves, and woodpiles from around your home and garden. Seal gaps under porches, sheds, and outbuildings. Wear long pants when hiking in areas with tall grass or brush. Stay on cleared paths and avoid tall grass when possible. Do not reach under logs or rocks without looking first. Use a walking stick or probe tall grass ahead of you on trails. Most of Illinois, especially the northern and central regions, requires no special precautions against copperheads. Read more aboutcopperhead in Illinois.
Where in Illinois and when
Copperheads in Illinois are found only in the southern part of the state, particularly in counties along the Ohio River and Mississippi River valleys. Specific regions include areas south of the Wabash River, and throughout southern and southwestern Illinois. They are absent from the entire northern two-thirds of the state. Copperheads are active from late spring through early fall, with peak activity in warm months like May through September. They are most active during dawn and dusk. During winter, copperheads enter a dormant state. The southern Illinois regions near the Shawnee National Forest and along river valleys are where you are most likely to encounter one. Most state parks and recreation areas in central and northern Illinois have no copperheads. Browsewildlife in Illinoisfor related pages.
Harmless lookalikes
Many nonvenomous snakes in southern Illinois are mistaken for copperheads, which is good news. The most common lookalike is the water snake, which has a banded pattern but lacks the hourglass marking. Northern water snakes and other species frequent the same river valleys. Rat snakes, garter snakes, and milk snakes are also mistaken for copperheads. None of these snakes are medically significant, and all are beneficial to have around because they eat rodents and insects. If you see a snake in southern Illinois, it is far more likely to be one of these harmless species than a copperhead. Learning to identify these common snakes will ease your mind. Since copperheads are uncommon even in their limited Illinois range, you are most likely to encounter harmless species.
Frequently Asked Questions
Are copperheads deadly? Copperhead bites are treatable and rarely fatal with prompt medical care. How common are copperhead bites in Illinois? Bites are extremely uncommon even in southern Illinois where they live. What attracts copperheads to a house? Copperheads are drawn to areas with rodents, frogs, and insects. Eliminating rodent populations discourages them. What should I do if I see one? Leave it alone. Copperheads are not aggressive and will only bite if handled or stepped on. For more about Illinois wildlife and safety in southern counties, consult with park rangers or wildlife authorities.
Plan your trip
Best time to see copperhead in Illinois: October, September, May
See the month-by-month sighting calendar.
Plan your copperhead sighting in Illinois
479 verified copperhead records have been logged in Illinois, most recently in 2026. See the GBIF records.
Where to look in Illinois
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- Lincoln Home National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Emmett Till and Mamie Till-Mobley National Monument · Find hotels
- Mormon Pioneer National Historic Trail · Find hotels
- New Philadelphia National Historic Site · Find hotels
- Pullman National Historical Park · Find hotels
Frequently asked questions
Are they in Illinois?+
Copperheads are found in Illinois, but only in the southern part of the state. Their range is restricted primarily to the southern counties, particularly those bordering the Ohio River and along the Mississippi River valley. The counties south and west of the Wabash River and Ohio River contain established copperhead populations. Central and northern Illinois have no copperheads. Learn about Illinois wildlife to understand that copperheads are restricted to specific southern regions. The species reaches the northern edge of its range in southern Illinois, meaning they are less common here than in states farther south. Most Illinoisans, particularly those living in Chicago and central Illinois regions, will never encounter a copperhead. If you live or travel in northern or central Illinois, copperheads are not a concern for your outdoor activities. For more on copperhead in Illinois, see ourIllinois copperhead guide.
How dangerous is it?+
A copperhead bite is painful and requires medical attention, but it is not typically life-threatening in healthy adults. Copperhead venom causes local swelling, discoloration, and tissue damage at the bite site. Systemic effects are rare. Deaths from copperhead bites are very uncommon in the United States, especially with prompt medical care. The bite should be treated by a doctor to prevent complications and manage pain, but most bites do not result in severe outcomes. Dry bites, where no venom is injected, occur in about one-third of copperhead bites. Children, elderly individuals, and people with compromised immune systems should receive extra caution and immediate medical evaluation. Given that copperheads are uncommon even in southern Illinois, actual bite incidents are extremely rare in the state. You can also browseIllinois wildlife.
More wildlife in Illinois