Are There Black Widows in Missouri?
Yes, black widows live in Missouri, particularly in the southern and central regions. Bites are very rare and rarely serious with prompt medical care. These spiders prefer warm, sheltered spaces. Knowing how to identify and avoid them will help you stay safe.
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
- 4
- species recorded
- 344
- GBIF records
- May, June, September
- peak months
Yes, black widows are in Missouri. Next you'll want:
Verified species, source iNaturalist
2 types of black widows recorded in Missouri
2 black widow species have a verified observation record in Missouri, each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
- No openly licensed photo yet1
- No openly licensed photo yet2
Plus 2 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations.
Real sighting data, source iNaturalist
709 verified observations on iNaturalist of black widow have been recorded in Missouri, most often in May, June, September.
When black widow are recorded in Missouri
Yes, black widows live in Missouri, particularly in the southern and central regions. Bites are very rare and rarely serious with prompt medical care. These spiders prefer warm, sheltered spaces. Knowing how to identify and avoid them will help you stay safe.
Are they in Missouri?
Black widows do live in Missouri, particularly in the southern and central regions where temperatures support their survival. They are not common indoor spiders but do establish populations in outbuildings, farm structures, and garden areas. The southern region with its warmer climate provides ideal conditions for year-round survival in protected spaces. Black widow populations tend to concentrate in rural and semi-rural areas with less frequent human disturbance. You are far more likely to encounter a black widow in a storage shed or under a rock than inside your home. Bites are reported occasionally in Missouri, but serious cases are very uncommon. Most spiders stay hidden in one spot once they build a web, making them predictable to locate and avoid. Bites happen when people accidentally press against a spider or disturb its hiding place. Refer toBlack Widow in Missourifor detailed safety information.
How dangerous is it?
A black widow bite is painful and should receive medical attention, but deaths are extremely rare in healthy people with prompt care. The venom affects the nervous system and can cause muscle pain and cramping. These symptoms may take hours to develop fully. Modern medicine handles black widow envenomation very effectively. Hospitals can provide muscle relaxants, fluids, and monitoring. Most bites result in local pain and minor systemic effects that resolve with supportive care. Serious complications are far more likely in very young children, elderly people, or those with heart disease or high blood pressure. The pain from a bite is often the most bothersome symptom and can last for days even with treatment. The risk of death from a black widow bite in Missouri is extremely low for anyone reaching medical care promptly.
How to recognize one
Female black widows are distinctive and easy to identify. They are shiny black with a round, grapefruit-sized body and notably long legs. The most recognizable feature is the bright red or orange hourglass marking on the underside of the abdomen. Males are much smaller and less shiny, and may have red or white stripes instead of the classic hourglass. Immature black widows may have more red coloring before they reach adulthood. Black widows are not aggressive and will only bite if squeezed or pressed directly against your skin. They prefer to stay hidden in their webs, often in dark corners, under rocks, in brush piles, or in undisturbed spaces around outbuildings and farm structures. Their webs are irregular and tangled, not the neat geometric orbs built by other spider species. Keep children and pets away from the area if you see one.
What to do if you are bitten or stung
If you think you have been bitten, stay calm and wash the bite area with soap and water. Remove any rings or tight clothing in case of swelling. Keep the bitten area still and at or below heart level to reduce venom circulation. Do not apply ice, use a tourniquet, or attempt field treatment. Seek medical care at an emergency room or urgent care clinic, especially if you begin to feel muscle pain or cramping. Symptoms may develop over an hour or more, so do not wait to see if symptoms worsen before seeking help. 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. Tell the doctor you believe a black widow bit you and describe the spider if you saw it. A photo is helpful if you have one. Do not try to capture or kill the spider; a description is enough. Medical teams in Missouri are familiar with black widow bites and can provide appropriate care.
How to prevent encounters in this state
Keep your home and yard clear of hiding spots. Store firewood away from your house in a covered area and wear gloves when handling it before bringing inside. Check shoes and folded clothing stored in garages or basements before putting them on. Keep garages organized with good lighting and minimal clutter. Seal cracks and gaps around doors, windows, and foundation areas, especially in basements. Wear long sleeves and gloves when working in gardens or moving objects outside. Regularly clean out corners of porches and eaves where spiders might build webs. If you find a black widow web, spray it from a distance with water or pesticide, or leave it alone and let the spider relocate. When camping or hiking in Missouri, check your tent and sleeping bag before settling in for the night. SeeMissouri wildlifefor more protection tips.
Where in Missouri and when
Black widows in Missouri are most active from late spring through early fall, with peak activity in July and August when temperatures are warmest. They can survive year-round in heated buildings but are much less common in winter outdoors. Geographically, they are more common in southern Missouri, particularly the Ozark region and areas around the Mississippi River and its floodplains. Central Missouri also reports occasional sightings. Northern Missouri sees them far less often because the climate is cooler. They favor rural areas with undisturbed outbuildings and natural rocky areas more than urban centers. Caves and wilderness areas may have black widows in natural sheltered spots. Parks and outdoor spaces throughoutMissourimay harbor black widows in suitable habitat.
Harmless lookalikes
If you find a black spider in Missouri, it is far more likely a harmless species than a black widow. Cellar spiders are common in basements and have very long, thin legs and pale or grayish bodies. House spiders and cobweb spiders come in various brown shades and lack the black widow's shiny appearance and red hourglass. Wolf spiders are sometimes confused with black widows because of their dark color, but they are fast hunters with better eyesight and are far less interested in staying on a web. Jumping spiders are small and stocky with large forward-facing eyes and are completely harmless. Ground spiders and other local species are also common. If you see a shiny black spider but cannot find a red hourglass on the underside, it is almost certainly not a black widow. Most dark spiders found in Missouri are harmless species. Learn more fromour wildlife guidesabout local spider species.
Frequently Asked Questions
Are black widow bites deadly? Black widow bites are rarely fatal in modern medicine. With prompt medical care, the risk is very low for healthy people. Serious cases can occur in very young children or elderly people. How common are black widow bites in Missouri? Bites are uncommon. Most people in Missouri never encounter a black widow or experience a bite in their lifetime. Spiders avoid humans and only bite as a last resort when threatened. What attracts black widows to a house? Black widows are attracted to dark, undisturbed areas with insects for food. Cluttered sheds, basements, and storage spaces are common trouble spots. What should I do if I see one? Do not approach it or touch it. Keep children and pets away. Spray it from distance or call pest control if it is in a frequently used space. Seemore on Black Widow in Missourifor additional safety information.
Plan your trip
Best time to see black widow in Missouri: May, June, September
See the month-by-month sighting calendar.
Plan your black widow sighting in Missouri
344 verified black widow records have been logged in Missouri, most recently in 2026. See the GBIF records.
Where to look in Missouri
- George Washington Carver National Monument · Birdwatching · Find hotels
- Lewis & Clark National Historic Trail · Wildlife Watching · Find hotels
- Ozark National Scenic Riverways · Wildlife Watching, Birdwatching · Find hotels
- Ulysses S Grant National Historic Site · Wildlife Watching, Birdwatching · Find hotels
- Wilson's Creek National Battlefield · Wildlife Watching, Birdwatching · Find hotels
- Butterfield Overland National Historic Trail · Find hotels
Frequently asked questions
Are they in Missouri?+
Black widows do live in Missouri, particularly in the southern and central regions where temperatures support their survival. They are not common indoor spiders but do establish populations in outbuildings, farm structures, and garden areas. The southern region with its warmer climate provides ideal conditions for year-round survival in protected spaces. Black widow populations tend to concentrate in rural and semi-rural areas with less frequent human disturbance. You are far more likely to encounter a black widow in a storage shed or under a rock than inside your home. Bites are reported occasionally in Missouri, but serious cases are very uncommon. Most spiders stay hidden in one spot once they build a web, making them predictable to locate and avoid. Bites happen when people accidentally press against a spider or disturb its hiding place. Refer toBlack Widow in Missourifor detailed safety information.
How dangerous is it?+
A black widow bite is painful and should receive medical attention, but deaths are extremely rare in healthy people with prompt care. The venom affects the nervous system and can cause muscle pain and cramping. These symptoms may take hours to develop fully. Modern medicine handles black widow envenomation very effectively. Hospitals can provide muscle relaxants, fluids, and monitoring. Most bites result in local pain and minor systemic effects that resolve with supportive care. Serious complications are far more likely in very young children, elderly people, or those with heart disease or high blood pressure. The pain from a bite is often the most bothersome symptom and can last for days even with treatment. The risk of death from a black widow bite in Missouri is extremely low for anyone reaching medical care promptly.
More wildlife in Missouri