How to Get Rid of Black Widow Spiders

Confirm you have black widow spiders

Correct identification matters, because the right fix for black widow spiders differs from the fix for their lookalikes. Adults measure 3–13 mm (up to about 0.51 in) and are usually black and red. Look for these features:

• Glossy black, globe-shaped abdomen
• Red or orange hourglass marking underneath
• Irregular, strong tangled web close to the ground

They are most often confused with southern house spider, common house spider and bold jumping spider. See the full black widow spider profile for side-by-side details.

Why you have black widow spiders

Black Widow Spiders hide in dark, undisturbed spots such as closets, garages, woodpiles and boxes. Other insects in the home give them a steady food supply. Clutter provides endless hiding places. They are most active in spring, summer, fall and winter, so expect to see more of them then.

When you'll see black widow spiders

Black Widow Spiders are most active in spring, summer, fall and winter. In spring, overwintering adults become active and many species lay their first eggs. Summer heat speeds up development, so populations can grow quickly. In fall, many bugs look for shelter, and some move toward or into buildings. In winter, activity continues mainly indoors in heated spaces.

Typical places to check: basement or garage, yard or patio and woods or trails.

Step-by-step: getting rid of black widow spiders

Step 1: Wear gloves when moving firewood

Wear gloves when moving firewood, boxes and outdoor items. Repeat this for at least two to three weeks, since eggs and hidden insects keep appearing for a while.

Step 2: Clear clutter from garages

Clear clutter from garages, sheds and crawl spaces. Combine this with the other steps rather than relying on it alone.

Step 3: Remove webs

Remove webs and egg sacs with a vacuum or long tool. Keep notes on where you still see activity so you can focus your effort.

Natural and low-toxicity options

These methods work well alongside the steps above and keep chemical use to a minimum:

• Reduce clutter and store items in sealed plastic bins.
• Wear gloves and shake out shoes and clothing.
• Use sticky traps along walls to catch and monitor them.
• Vacuum webs and egg sacs regularly.

If you do use a pesticide, choose one labeled for this pest and the place you're treating, and follow the label exactly. The label is the law.

When to call a professional

Because black widow spiders can be medically significant, call a licensed pest professional if you find them regularly indoors, especially in bedrooms or where children play.

How to keep black widow spiders from coming back

• Seal gaps around doors, windows and utility lines.
• Move beds away from walls and keep bedding off the floor.
• Store firewood away from the house.
• Control the insects they feed on.

Safety notes

Females have venom that can cause severe muscle pain and cramps; seek medical care after a bite.

Call 911 right away if someone has trouble breathing, swelling of the face or throat, dizziness or a racing heartbeat after a bite or sting.

About spiders

The black widow spider is one of the spiders. Spiders have eight legs, two main body sections and no antennae. Almost all spiders have venom to subdue prey, but only a few have venom that matters to people. Many build webs, while others, such as wolf spiders and jumping spiders, hunt on foot.

Spiders go where their food is. A home with lots of spiders usually has plenty of other insects, so general pest control reduces spiders too.

Frequently asked questions