Are There Black Widows in Massachusetts?
No, Black Widows are not established in Massachusetts. This venomous spider cannot survive the state's cold winters and is far too rare to be a concern. While Black Widows are found from Maryland southward, New England remains outside their range. Understanding where this spider actually lives helps ease worry about yard work and outdoor activities.
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
- 3
- species recorded
- 162
- GBIF records
- June, September, May
- peak months
Yes, black widows are in Massachusetts. Next you'll want:
Real sighting data, source iNaturalist
173 verified observations on iNaturalist of black widow have been recorded in Massachusetts, most often in June, September, May.
When black widow are recorded in Massachusetts
No, Black Widows are not established in Massachusetts. This venomous spider cannot survive the state's cold winters and is far too rare to be a concern. While Black Widows are found from Maryland southward, New England remains outside their range. Understanding where this spider actually lives helps ease worry about yard work and outdoor activities.
Are they in Massachusetts?
Black Widows are not established anywhere in Massachusetts. The state's cold climate, particularly its harsh winters with sustained freezing temperatures, makes it impossible for this heat-loving spider to survive outdoors year-round. Black Widows begin to appear as established populations only in Maryland and states to the south and west. Massachusetts, along with the rest of New England, lies well outside the normal range of this spider.Black Widows in Massachusettsdo not occur naturally. While a single Black Widow might theoretically arrive in a shipment from a southern state, such events are extremely rare and do not result in breeding populations. The nearest established populations of Black Widows are found in Maryland and the southern mid-Atlantic states.Massachusetts wildliferemains free of this dangerous spider.
How dangerous is it?
A Black Widow bite is medically significant and requires attention, though deaths are extremely rare. The venom acts on the nervous system and can cause muscle pain, cramping, and sweating within an hour of the bite. Most healthy adults experience painful symptoms that gradually improve over several hours to a few days, especially with medical care. Children, elderly people, and those with heart disease are at higher risk for severe reactions. Symptoms may include severe muscle cramping, tremors, profuse sweating, and a general sense of illness. The initial bite is often painless, and many people do not realize they have been bitten until symptoms develop. Modern medical treatment is very effective at relieving symptoms.Learn more about spider safety.
How to recognize one
Black Widows are small spiders about the size of a pea in body length, not including their legs. They are jet black or very dark brown with a distinctive shiny appearance. The most recognizable feature is a bright red or orange hourglass marking on the underside of the abdomen. Some individuals also have red spots on the upper side of the abdomen. The female is noticeably larger than the male. These spiders spin tangled webs in dark, undisturbed places such as woodpiles, heavy vegetation, garage corners, and underneath outdoor furniture. They are sedentary spiders that remain in one spot and do not chase prey across open ground.For more wildlife safety, learn to identify spiders safely.
What to do if you are bitten or stung
Stay calm and do not panic. Wash the bitten area gently with soap and water. Remove any tight jewelry, rings, or bracelets from the affected area, as mild swelling can occur. Sit or lie down and keep the bitten limb still and elevated if possible. Do not attempt to apply a tourniquet or restrict blood flow. Do not cut, squeeze, or suck the bite. Do not apply ice directly to the skin, though a cool cloth may help reduce discomfort. Seek medical attention immediately, even if symptoms seem mild, so doctors can monitor your condition. Contact Poison Control for guidance on next steps. If symptoms are severe, such as chest pain or difficulty breathing, call 911. In Massachusetts, hospitals and urgent care centers are equipped to handle spider bites. 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
Since Black Widows do not live in Massachusetts, standard spider prevention practices are sufficient. These practices benefit your overall pest management and wildlife safety. Wear work gloves when handling items stored in basements, attics, or sheds. Shake out clothing, shoes, and bedding before putting them on, which is good practice against all pests. When gardening, wear closed-toe shoes and gloves. Clear dead wood, leaf piles, and dense brush from around your home, which creates a cleaner yard overall. Keep your garage, basement, and shed well organized and clutter-free. Store items in sealed containers or on shelves rather than on the ground. Inspect patio furniture before sitting on it.Find more Massachusetts wildlife safety tips.
Where in Massachusetts and when
Black Widows do not occur naturally anywhere in Massachusetts. There are no established populations in any part of the state, from coastal Essex County to the Berkshires in the west, from Cape Cod in the south to the northern border. The state's entire climate is too cold for year-round Black Widow survival. Even during summer heat waves, when Massachusetts experiences brief periods of 90-degree temperatures, these warm spells do not allow Black Widows to establish permanent populations. Massachusetts winters regularly drop well below freezing and remain cold for months at a time. This sustained cold kills any Black Widow that might accidentally arrive. In contrast, Maryland, Virginia, and states to the south experience warm enough conditions for Black Widows to thrive outdoors year-round.
Harmless lookalikes
The spiders found throughout Massachusetts are almost all harmless species. Cellar spiders, often called daddy longlegs, have extremely long, thin legs and small bodies. They are completely harmless and actually help control pest insects in your home. Wolf spiders are common in Massachusetts yards and gardens. They are brown and stocky, with excellent eyesight and an active hunting style. Jumping spiders are small, fuzzy, and adorable, with remarkable vision. Ground spiders and sheet web spiders are common and harmless. Orb weavers create beautiful circular webs seen in gardens and fields. Fishing spiders live near water sources and are sometimes mistaken for dangerous spiders but are harmless. Cobweb spiders are found in homes and outbuildings everywhere. If you find any spider in Massachusetts, it is almost certainly one of these common harmless species.
Frequently Asked Questions
Are Black Widows deadly in Massachusetts? Black Widows are not found in Massachusetts, so this is not a real concern for residents. Hypothetically, a Black Widow bite can be serious but is very rarely fatal with modern medical care. Are Black Widow bites common in Massachusetts? Black Widow bites do not occur in Massachusetts because the spider does not live here. The risk is zero for wild spiders in the state. What should I do if I find a spider I think might be a Black Widow? Take a clear photograph and contact your local wildlife authority, the Massachusetts Division of Fisheries and Wildlife, or an extension office for identification. What attracts Black Widows to a house? In places where Black Widows do live, they are attracted to dark storage areas and garages.Check our wildlife guidefor species identification help and regional safety information.
Plan your trip
Best time to see black widow in Massachusetts: June, September, May
See the month-by-month sighting calendar.
Plan your black widow sighting in Massachusetts
162 verified black widow records have been logged in Massachusetts. See the GBIF records.
Where to look in Massachusetts
- Appalachian National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Blackstone River Valley National Historical Park · Wildlife Watching, Birdwatching · Find hotels
- Boston Harbor Islands National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Cape Cod National Seashore · Wildlife Watching, Birdwatching · Find hotels
- Adams National Historical Park · Find hotels
- Boston African American National Historic Site · Find hotels
Frequently asked questions
Are they in Massachusetts?+
Black Widows are not established anywhere in Massachusetts. The state's cold climate, particularly its harsh winters with sustained freezing temperatures, makes it impossible for this heat-loving spider to survive outdoors year-round. Black Widows begin to appear as established populations only in Maryland and states to the south and west. Massachusetts, along with the rest of New England, lies well outside the normal range of this spider.Black Widows in Massachusettsdo not occur naturally. While a single Black Widow might theoretically arrive in a shipment from a southern state, such events are extremely rare and do not result in breeding populations. The nearest established populations of Black Widows are found in Maryland and the southern mid-Atlantic states.Massachusetts wildliferemains free of this dangerous spider.
How dangerous is it?+
A Black Widow bite is medically significant and requires attention, though deaths are extremely rare. The venom acts on the nervous system and can cause muscle pain, cramping, and sweating within an hour of the bite. Most healthy adults experience painful symptoms that gradually improve over several hours to a few days, especially with medical care. Children, elderly people, and those with heart disease are at higher risk for severe reactions. Symptoms may include severe muscle cramping, tremors, profuse sweating, and a general sense of illness. The initial bite is often painless, and many people do not realize they have been bitten until symptoms develop. Modern medical treatment is very effective at relieving symptoms.Learn more about spider safety.