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Black widow: how to identify it and what to do in Arizona
You may have seen a shiny black spider in a garage corner, under patio furniture, or in a messy web near the ground. This page helps you tell whether it’s a black widow, how much bite risk there is, plus what to do without putting your hands near it.
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- Messy, tough webs near the ground
- Shiny black female in a web
- Red hourglass under abdomen
- Egg sacs in sheltered corners
- Sightings in garages or woodpiles
- Pain after reaching into clutter
If someone was stung or bitten
Call Poison Help at 1-800-222-1222. It's answered around the clock by nurses and pharmacists at Arizona's poison centers, and they'll tell you whether you can stay home.
Call Poison Help: 1-800-222-1222
Call 911 right away for trouble breathing, swallowing or talking, or for a young child with strong symptoms.
In the Phoenix area, a black widow is usually the western black widow, a venomous spider with a rounded body and a red to orange hourglass under the abdomen. The adult female is the one that matters for bite risk, and a bite can cause serious pain or body-wide symptoms. Keep away from the spider, use the Poison Help panel above if a bite is possible, then check for webs and egg sacs in sheltered spots.
Black widows eat insects caught in their webs. Around homes, they use quiet shelter such as garages, woodpiles, lawn furniture, sheds, cracks, vents, and block wall gaps. They don’t need much space.
A mature female often stays close to her web. At night she may hang with her underside facing up, which can make the hourglass easier to see. If the web is disturbed, she often retreats into a nearby crack or hole.
Finding one black widow doesn’t always mean the house is overrun. It does mean the area has shelter and prey. Egg sacs, repeated webs, or several females in different spots point to a larger problem.
Indoors, black widows are less likely to thrive in busy living areas because they need insects and quiet retreats. Garages, storage rooms, pool equipment areas, patios, and sheds are more likely places to find them in Valley homes.
- Adult females are shiny black or very dark brown.
- The abdomen is rounded and larger than the front body section.
- The red to orange hourglass is on the underside.
- The web is tangled, irregular, and strong.
- They usually hide by day, then sit in the web at night.
- Look low in cracks, holes, woodpiles, garages, or patio clutter.
Health risk
Black widows are shy spiders that bite in self-defense, often after being trapped or touched. Adult females pose the main health risk because they are larger and have more venom. A black widow bite can cause pain, cramps, sweating, nausea, dizziness, or other symptoms, so use the Poison Help panel above if a bite may have happened.
In the Phoenix area, spider activity tends to rise as spring warmth brings more insects. Warm, dry desert conditions also suit western black widows in sheltered places around homes.
What's different in the Phoenix area
Phoenix homes give black widows a lot of shelter, especially garages, sheds, patio furniture, woodpiles, pool equipment boxes, and block walls. Those block wall gaps along side yards are a very Valley hiding place. Warm weather and insects around lights or storage areas can keep webs active near the house.
Often confused with
What you can do today
Keep hands away
Don’t pick up the spider, web, or egg sac by hand. Use a flashlight first, especially before reaching into boxes, gloves, shoes, patio cushions, or stored yard gear.
Look for messy webs
Check low, sheltered areas near the garage door, storage shelves, outdoor furniture, woodpiles, sheds, and pool equipment. A black widow web looks tangled and can be much tougher than a normal cobweb, but don't touch it.
Reduce clutter
Move stored items off the floor when you can. Shake out gloves, shoes, towels, and equipment that sat in a garage or outside before use.
Vacuum with distance
For reachable webs in safe spots, don't vacuum a widow or egg sac yourself. Mark the area, keep hands back, keep kids and pets away, and call a professional if a spider or egg sac is present.
Block easy entry
Repair torn screens, add door sweeps where needed, and seal small gaps around doors or utility openings. University of Arizona guidance also points to weather stripping and caulking to reduce spider entry.
When to call a pest control company
A local pest control company is worth calling when you find more than one black widow, see egg sacs, keep clearing webs that return, or find widows in living spaces. It’s also a good step if someone in the home is very young, older, or has health concerns. A technician will look for web sites, hiding cracks, egg sacs, insect prey, and entry points around the structure.
Not sure what you're dealing with?
Describe it on the phone. The company on the other end handles these calls every day and will know what to ask.
Common questions about black widow in Phoenix
What should I do for a black widow bite?
Use the Poison Help panel above right away if a black widow bite is possible. If you can do so without touching the spider, a photo may help with identification.
Are black widows common in Arizona?
Yes. The western black widow is a common spider in warm western areas, including Arizona, and it often uses human-made shelter around homes.
Will a black widow chase me?
No. Black widows are shy and usually stay close to a retreat in the web. Bites tend to happen when the spider is pressed, trapped, or touched.
What does a black widow web look like?
The web is messy, irregular, and strong. It is often placed in a sheltered spot near the ground, with the spider waiting there at night.
Do male black widows look like the female?
Males are much smaller and usually brown with lighter markings. Juveniles can also be patterned, so the classic shiny black body with a red underside hourglass is mainly the mature female.
Get the black widow problem looked at
One call connects you with an independent pest control company in your part of the Valley. Mon-Fri 9am-5pm.