Are There Black Widows in Pennsylvania?
No, black widows are not established in Pennsylvania. These venomous spiders are found only in warm southern and southwestern states. Pennsylvania's cool climate from the Appalachian region to the Allegheny Mountains is far too cold for black widows to survive. While they live in warmer states to the south, Pennsylvania residents do not need to worry about these spiders.
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
- 90
- GBIF records
- June, May, July
- peak months
Yes, black widows are in Pennsylvania. Next you'll want:
Verified species, source iNaturalist
2 types of black widows recorded in Pennsylvania
2 black widow species have a verified observation record in Pennsylvania, 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 1 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations.
Real sighting data, source iNaturalist
152 verified observations on iNaturalist of black widow have been recorded in Pennsylvania, most often in June, May, July.
When black widow are recorded in Pennsylvania
No, black widows are not established in Pennsylvania. These venomous spiders are found only in warm southern and southwestern states. Pennsylvania's cool climate from the Appalachian region to the Allegheny Mountains is far too cold for black widows to survive. While they live in warmer states to the south, Pennsylvania residents do not need to worry about these spiders.
Are They in Pennsylvania?
Black widows are not found in Pennsylvania. These spiders require warm, consistent temperatures throughout the year, and Pennsylvania's four-season climate does not meet their needs. The Appalachian region, which covers much of eastern Pennsylvania, has cold winters and mild summers that are unsuitable for black widow survival. Even the warmest months in Philadelphia and Pittsburgh do not provide the sustained heat these spiders require to breed and establish populations. Black widows are found primarily in the southern and southwestern United States where winters are mild and summers are long and hot. If a black widow were transported to Pennsylvania, it could not survive outdoors through winter or establish a breeding population. Explorewildlife in Pennsylvaniato learn about the spider species that actually live here. The nearest states with black widows are far to the south. For information on Pennsylvania's actual wildlife, check outwildlife guides.
How Dangerous Is It?
Since black widows do not live in Pennsylvania, there is no local danger from these spiders. However, understanding their venom is useful if you travel to warmer regions. A black widow bite is medically significant and requires medical attention. The venom affects the nervous system and causes muscle pain, cramping, sweating, and other effects. Death from a black widow bite is extremely rare in healthy adults, especially with prompt medical treatment. Most bites occur when the spider is accidentally pressed against skin, such as when putting on clothing or reaching into a dark space. The bite itself may feel like a pinprick and might go unnoticed at first, though pain usually develops within an hour. With proper medical care, almost everyone recovers completely. Understanding the actual danger level helps separate fact from excessive worry. Learn more aboutwildlife in Pennsylvaniaand the harmless spiders that live here instead.
How to Recognize One
If you travel to a state where black widows live, knowing how to identify them helps you avoid contact. Black widows are small spiders, typically one half inch in body length, with a shiny black abdomen. The signature feature is a bright red or red-orange hourglass marking on the underside of the abdomen. Some individuals have a red stripe running down the center of the back. The head and legs are glossy black and smooth. Male black widows are much smaller than females and often have red spots or stripes on the back. These spiders are shy and prefer to hide in warm, dark, undisturbed spaces like woodpiles, under rocks, inside sheds, in tight building crevices, and around porch eaves. They do not seek out humans and bite only when they feel threatened or when accidentally pressed against skin. In Pennsylvania, you will not encounter them outdoors or in homes.
What to Do If Bitten or Stung
Since black widows do not live in Pennsylvania, bites are not a concern here. However, if you travel south and believe you have been bitten by a black widow, stay calm and take the right steps. Remove any tight rings or jewelry from the affected limb right away. Keep the bitten area still and avoid moving it more than necessary. Do not apply ice, heat, or any topical treatment. Do not attempt to treat it with cutting, sucking, or any home remedy. Seek medical care immediately by going to an emergency room or urgent care facility. 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 provide appropriate treatment if needed. Pennsylvania hospitals and urgent care centers are well equipped to handle spider bites in travelers returning from other regions.
How to Prevent Encounters
Prevention is straightforward in Pennsylvania: black widows do not live here, so there is nothing to prevent. However, if you travel to warmer southern states, practical steps reduce spider encounters. Wear closed shoes and long pants when hiking, working in brush, or handling firewood. Shake out shoes, hats, and clothing before putting them on, especially items stored in dark places. When camping in warmer states, inspect tents and sleeping bags before use. Use a flashlight to check dark spaces like under rocks or in cabin corners. Wear gloves when moving stored items, firewood, or garden materials in warm climates. Keep shoes and sports equipment away from walls and dark corners. Avoid reaching into spaces you cannot see without a light. In Pennsylvania, your wildlife concerns are different. Learn about the spiders and wildlife that actually live here by visitingyour local wildlife guides.
Where in Pennsylvania and When
Black widows do not occur anywhere in Pennsylvania at any time of year. However, understanding their actual range provides context. Black widows are found primarily in the southwestern United States, including Arizona, Nevada, southern California, southern New Mexico, and parts of Texas. They also occur in parts of the southeastern states, but not as far north as Pennsylvania. Black widows prefer warm, dry climates with temperatures consistently above 70 degrees Fahrenheit. In the states where they live, they are most active during warm months, typically April through October, when they hunt, mate, and lay eggs. In winter, they may become dormant in their hiding places or die if exposed to extreme cold. Pennsylvania's cold winters, with temperatures often dropping below freezing, make the entire state unsuitable for black widow survival and establishment. To learn about spiders that actually live in your state, visit thePennsylvania wildlife section.
Harmless Lookalikes
In Pennsylvania, if you find a small dark spider with red or orange markings, it is almost certainly not a black widow because black widows do not live in Pennsylvania. The spiders you are likely to encounter are harmless Pennsylvania natives. Wolf spiders are common in Pennsylvania gardens, homes, and woodlands. They are brown or gray, lack the distinctive hourglass mark, and are completely harmless. House spiders, including common cellar spiders with long legs, are found throughout Pennsylvania homes and are harmless. Fishing spiders, found near water and in damp basements, are sometimes mistaken for black widows but are harmless. Orb weavers create beautiful symmetrical webs and are abundant in Pennsylvania, posing no danger. If you find any small dark spider in Pennsylvania, it is almost certainly one of these local harmless species. Knowing the realwildlife in Pennsylvaniahelps you appreciate the harmless spiders that actually live in your state and neighborhood.
Frequently Asked Questions
Are Black Widows deadly? Black widow bites are medically serious and require professional care, but death is extremely rare in healthy adults, especially with prompt treatment. Most people recover completely with proper medical care. How common are Black Widow bites in Pennsylvania? They are not common at all because black widows do not live in Pennsylvania. No one in Pennsylvania has been bitten by a black widow in their home state. What attracts Black Widows to a house? Black widows prefer undisturbed dark spaces like closets, basements, storage areas, and porch corners. They hide rather than actively seek humans. In Pennsylvania, this is not a concern because they cannot survive here. What should I do if I see one? If you see a shiny black spider with a red hourglass mark while in Pennsylvania, it is definitely not a black widow because black widows do not live here. Most dark spiders in Pennsylvania are harmless. If you are traveling in southwestern states and see one, leave it alone. For information about local spider species, visityour wildlife guide.
Plan your trip
Best time to see black widow in Pennsylvania: June, May, July
See the month-by-month sighting calendar.
Plan your black widow sighting in Pennsylvania
90 verified black widow records have been logged in Pennsylvania, most recently in 2026. See the GBIF records.
Where to look in Pennsylvania
- Appalachian National Scenic Trail · Wildlife Watching, Birdwatching · Find hotels
- Captain John Smith Chesapeake National Historic Trail · Wildlife Watching, Birdwatching · Find hotels
- Chesapeake Bay · Wildlife Watching · Find hotels
- Delaware Water Gap National Recreation Area · Wildlife Watching, Birdwatching · Find hotels
- Fort Necessity National Battlefield · Wildlife Watching, Birdwatching · Find hotels
- Friendship Hill National Historic Site · Wildlife Watching, Birdwatching · Find hotels
Frequently asked questions
Are They in Pennsylvania?+
Black widows are not found in Pennsylvania. These spiders require warm, consistent temperatures throughout the year, and Pennsylvania's four-season climate does not meet their needs. The Appalachian region, which covers much of eastern Pennsylvania, has cold winters and mild summers that are unsuitable for black widow survival. Even the warmest months in Philadelphia and Pittsburgh do not provide the sustained heat these spiders require to breed and establish populations. Black widows are found primarily in the southern and southwestern United States where winters are mild and summers are long and hot. If a black widow were transported to Pennsylvania, it could not survive outdoors through winter or establish a breeding population. Explorewildlife in Pennsylvaniato learn about the spider species that actually live here. The nearest states with black widows are far to the south. For information on Pennsylvania's actual wildlife, check outwildlife guides.
How Dangerous Is It?+
Since black widows do not live in Pennsylvania, there is no local danger from these spiders. However, understanding their venom is useful if you travel to warmer regions. A black widow bite is medically significant and requires medical attention. The venom affects the nervous system and causes muscle pain, cramping, sweating, and other effects. Death from a black widow bite is extremely rare in healthy adults, especially with prompt medical treatment. Most bites occur when the spider is accidentally pressed against skin, such as when putting on clothing or reaching into a dark space. The bite itself may feel like a pinprick and might go unnoticed at first, though pain usually develops within an hour. With proper medical care, almost everyone recovers completely. Understanding the actual danger level helps separate fact from excessive worry. Learn more aboutwildlife in Pennsylvaniaand the harmless spiders that live here instead.
More wildlife in Pennsylvania