Are There Black Widows in Wisconsin?
No, black widows are not established in Wisconsin. These spiders need warm climates and cannot survive Wisconsin's cold winters. A black widow in Wisconsin would be extremely rare, likely a wanderer from the South. This page explains why black widows do not live here, what to do if you encounter one, and the harmless spiders you might find.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated July 22, 2026.
Northern Black Widow · Joseph McPhail CC BY
Western Black Widow · Rebecca Ray CC BY
Western Black Widow · Michael Eisen CC BY
- 2
- species recorded
- 56
- GBIF records
- June, July, May
- peak months
Yes, black widows are in Wisconsin. Next you'll want:
Real sighting data, source iNaturalist
101 verified observations on iNaturalist of black widow have been recorded in Wisconsin, most often in June, July, May.
When black widow are recorded in Wisconsin
No, black widows are not established in Wisconsin. These spiders need warm climates and cannot survive Wisconsin's cold winters. A black widow in Wisconsin would be extremely rare, likely a wanderer from the South. This page explains why black widows do not live here, what to do if you encounter one, and the harmless spiders you might find.
Are they in Wisconsin?
Black widows do not live in Wisconsin. This is good news if you worry about them. These spiders require warm weather year-round, and Wisconsin's long, cold winters make it impossible for populations to survive here. The southern and western United States are home to black widows, but they have never established themselves in Wisconsin. If you found a spider you thought was a black widow in Wisconsin, it was almost certainly something else. You can read more about allWisconsin wildlifeto learn what spiders actually live here. The only way a black widow could reach Wisconsin is as an accidental hitchhiker in a shipment from a warmer state, and even then it would not survive long outdoors. Wisconsin's climate simply does not support black widows, and you should not worry about finding one.
How dangerous is it?
A black widow bite is painful and potentially serious, but bites are rare and deaths from black widow bites in the United States are extremely uncommon. Most people bitten by a black widow experience pain at the bite site within minutes, and muscle cramps may develop. Symptoms can include muscle aches, stiffness, sweating, and trembling. However, these symptoms respond well to medical care, and healthy adults rarely face serious complications. Children and older adults may have a harder time with a bite. The real risk would only apply if you somehow encountered a wild black widow or received one in a shipment, which is exceptionally unlikely in Wisconsin. If you are bitten by any spider, stay calm and seek medical attention. For information aboutBlack Widow in Wisconsin, check our safety guide. 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.
How to recognize one
If a black widow spider somehow arrived in Wisconsin, you would recognize it by its distinctive appearance. A black widow is small, usually less than half an inch long not counting the legs. The body is shiny and jet black, and females typically have a bright red or orange mark on the underside of the abdomen that looks like an hourglass or two triangles. Males are smaller and sometimes have red or white stripes on their backs. The spider's legs are long and thin. Black widows hide in dark, undisturbed places like woodpiles, sheds, under porches, in garages, and between rocks. They build messy webs in corners and crevices. If you live in Wisconsin and see a small black spider in your home, it is almost certainly a harmless house spider or cellar spider, not a black widow. The distinctive hourglass marking is the key identifier.
What to do if you are bitten or stung
If you are bitten by a spider in Wisconsin, the most important thing to do is stay calm. Remove any rings or tight bracelets from the bitten area in case swelling occurs. Wash the bite with soap and water. Keep the bitten area still and elevated if possible. Apply a cool, damp cloth to the bite site. Do not try to catch or kill the spider, and do not try any home remedies. Some people apply a topical anesthetic to the area, but your doctor or pharmacist can advise you. Even if you think the bite might be from a black widow, which is extraordinarily unlikely in Wisconsin, seek medical care promptly. You can call your doctor or go to an urgent care clinic. For severe symptoms including difficulty breathing or severe muscle pain, call 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.
How to prevent encounters
Preventing encounters with black widows in Wisconsin is simple: because they do not live here, your regular yard and home maintenance will naturally keep them away. If you want to take extra precautions anyway, keep woodpiles neat and off the ground, away from your home. Store firewood in a covered area if possible. Wear gloves when handling stored items like wood, cardboard boxes, or old gardening equipment. Shake out items that have been stored away before using them. When hiking or camping in Wisconsin, wear long sleeves and pants in warm months, and check yourself for ticks and other insects when you come inside. Keep your garage and shed organized with items off the floor. For more aboutwildlife safety in Wisconsin, check our resources. When traveling to warmer states where black widows do live, follow the same precautions. Be aware of your surroundings when reaching into dark corners or undisturbed spaces.
Where in Wisconsin and when
Black widows do not occur in Wisconsin, so there is no where or when to worry about in this state. However, understanding where they actually live will help you recognize the difference. Black widows are found in the southern and western United States, from the Carolinas west to the Pacific Coast, with the southern black widow most common in the Southeast and Gulf states, and the western black widow living in the Southwest and parts of the West. They are active during warm months, typically from spring through fall, when temperatures are warm enough for them to thrive. In winter, they become dormant in protected spots. If you travel to southern states like Texas, Florida, or California, you might encounter them outdoors in warm months. Learn more aboutwildlife in Wisconsinto see the spiders that actually live here. Wisconsin's cooler climate means black widows could never survive the cold season or establish a population.
Harmless lookalikes
If you find a black spider in Wisconsin, it is almost certainly a harmless species, not a black widow. The most common black spiders in Wisconsin homes are cellar spiders and house spiders, both completely harmless. Cellar spiders have very long, thin legs and small bodies, and they often build webs in corners of basements and attics. Wolf spiders are another common Wisconsin spider that might look dark, but they are ground hunters and do not have the shiny, round body shape of a black widow. Wolf spiders are fast and do not build webs. Common ground spiders found in Wisconsin gardens are also harmless and brown to black in color. Jumping spiders, which are common indoors and outdoors in Wisconsin, are small and may appear black, but they have large forward-facing eyes and move in quick, jerky motions. None of these spiders have the distinctive hourglass marking on the abdomen. Wisconsin spiders are generally helpful, eating many insect pests.
Frequently Asked Questions
Are black widows deadly? In the United States, deaths from black widow bites are extremely rare, especially with prompt medical care. Most people who are bitten recover without lasting effects. How common are black widow bites in Wisconsin? There are essentially no black widow bites in Wisconsin because the spiders do not live here. Even nationally, bites are uncommon and usually happen when someone accidentally comes into contact with a spider in a dark corner. What attracts black widows to a house? Black widows hide in dark, cluttered places like woodpiles, sheds, garages, and attics. They do not come indoors to find people, but may accidentally be brought inside in shipments. Keeping your home organized helps prevent many pests. What should I do if I see one? If you see any spider in Wisconsin, stay calm. The chance it is a black widow is vanishingly small. Simply leave the spider alone or gently relocate it outdoors. You can checkour wildlife guidesfor help identifying spiders.
Plan your trip
Best time to see black widow in Wisconsin: June, July, May
See the month-by-month sighting calendar.
Plan your black widow sighting in Wisconsin
56 verified black widow records have been logged in Wisconsin. See the GBIF records.
Where to look in Wisconsin
- Apostle Islands National Lakeshore · Wildlife Watching, Birdwatching · Find hotels
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- North Country National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Saint Croix National Scenic Riverway · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
Are they in Wisconsin?+
Black widows do not live in Wisconsin. This is good news if you worry about them. These spiders require warm weather year-round, and Wisconsin's long, cold winters make it impossible for populations to survive here. The southern and western United States are home to black widows, but they have never established themselves in Wisconsin. If you found a spider you thought was a black widow in Wisconsin, it was almost certainly something else. You can read more about allWisconsin wildlifeto learn what spiders actually live here. The only way a black widow could reach Wisconsin is as an accidental hitchhiker in a shipment from a warmer state, and even then it would not survive long outdoors. Wisconsin's climate simply does not support black widows, and you should not worry about finding one.
How dangerous is it?+
A black widow bite is painful and potentially serious, but bites are rare and deaths from black widow bites in the United States are extremely uncommon. Most people bitten by a black widow experience pain at the bite site within minutes, and muscle cramps may develop. Symptoms can include muscle aches, stiffness, sweating, and trembling. However, these symptoms respond well to medical care, and healthy adults rarely face serious complications. Children and older adults may have a harder time with a bite. The real risk would only apply if you somehow encountered a wild black widow or received one in a shipment, which is exceptionally unlikely in Wisconsin. If you are bitten by any spider, stay calm and seek medical attention. For information aboutBlack Widow in Wisconsin, check our safety guide. 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.
More places to see black widow
More wildlife in Wisconsin