Venomous Spiders in Florida: What to Know

Serving Pompano Beach, Boynton Beach, and surrounding areas

If you see a spider around your home, you may wonder whether it is dangerous. Appearance alone is not always enough to determine the risk, and many harmless Florida spiders are easily mistaken for more concerning species.

It also helps to clarify a common terminology mistake: spiders are venomous, not poisonous. Venom is delivered through a bite or sting, while poison causes harm when it is ingested or otherwise absorbed.

Most spiders found in Florida are harmless to people. The spiders of greatest medical concern in the state are widow spiders, while recluse spiders are occasionally encountered but are not established throughout Florida.

Are There Venomous Spiders in Florida?

Yes. Florida is home to several species of widow spiders with medically significant venom. These include the southern black widow, northern black widow, red widow, and brown widow.

Widow spiders are generally shy and typically bite only when they are accidentally trapped against the skin or disturbed in a protected hiding place.

Black Widow Spiders

Black widow spiders are among the best-known venomous spiders in Florida. Females are typically glossy black and may have a distinctive red hourglass-shaped marking on the underside of the abdomen.

Widows often build irregular webs in sheltered, undisturbed areas such as sheds, garages, storage spaces, outdoor equipment, and beneath objects that have remained in place for long periods.

Black Widow Characteristics

• Glossy black body on adult females
• Red hourglass marking commonly found on the underside of the abdomen
• Rounded abdomen and slender legs
• Irregular, tangled web

Widow bites may cause intense pain, muscle cramping, sweating, nausea, and other systemic symptoms. Seek medical attention if you believe you were bitten by a widow spider or develop significant symptoms.

Other Widow Spiders Found in Florida

Florida is also home to brown widows, northern black widows, and red widows. Their coloration and markings vary, so identification should not rely on a single feature.

Brown widows, for example, can range from light brown to very dark brown and also have an hourglass marking on the underside of the abdomen.

Are Brown Recluse Spiders Found in Florida?

Brown recluse spiders are frequently blamed for bites in Florida, but they are not native to the state and are not considered established throughout Florida. Verified recluse spiders have occasionally been found in individual buildings or introduced through transported materials.

Many common Florida spiders are mistaken for brown recluses, so identification based only on brown coloring or a suspected violin-shaped marking can be unreliable.

Brown Recluse Characteristics

• Tan to brown coloring
• Six eyes arranged in three pairs
• Relatively slender legs
• A violin-shaped marking may be present, but it should not be used as the only identifying feature

If you find a spider you believe may be a recluse, avoid handling it and consider having it professionally identified.

How to Reduce Venomous Spider Activity Around Your Home

Reducing hiding areas and other insect activity can help make your property less attractive to spiders.

• Reduce clutter in garages, storage areas, sheds, and other undisturbed spaces.
• Wear gloves when moving firewood, boxes, outdoor equipment, or other items where spiders may hide.
• Shake out shoes, gloves, and clothing that have been stored for long periods.
• Seal cracks, gaps, and openings around doors, windows, and the foundation.
• Address flies, mosquitoes, and other insects that provide food for spiders.

Professional Spider Control in South Florida

Petri Pest Control Services, Inc. provides professional spider control throughout Broward & Palm Beach Counties, FL. Our technicians can inspect your property, identify areas of spider activity, and recommend targeted treatment and prevention strategies.

If you are concerned about widow spiders or another species around your home or business, contact Petri Pest Control for a free estimate.