Key takeaways
- One spider now and then is normal in South Florida; spiders several times a week, in several rooms, are a pattern worth investigating.
- Widow spiders are the only spiders native to or established in Florida with medically significant venom (UF/IFAS).
- No brown recluse population is established in Florida; about 20 verified specimens have turned up, all in buildings or vehicles.
- Spiders follow insects, so steady spider activity often means another pest problem is feeding them.
- Get medical care right away for a bite followed by spreading pain, cramps, sweating, nausea or a wound that worsens.
In this article
You should be concerned about spiders in your home when you see a pattern, not a single spider: spiders several times a week, in several rooms, egg sacs, webs that return right after cleaning, or a widow spider near the places your family uses. One spider that wandered in through the garage door is normal in South Florida and calls for nothing more than a vacuum.
The other reason for concern is what the spiders are eating. Spiders are hunters, so a home that keeps supporting them is usually supporting insects too. This guide gives you a simple way to tell normal activity from a problem, explains which Florida spiders actually matter for your health, and shows when it is time to bring in a professional.
An Occasional Spider Is Normal
Spiders are part of South Florida’s environment. Warm weather, humidity and green yards support a huge number of insects for most of the year, and spiders follow them. It is not unusual for a hunting spider to walk in under a door, through a torn screen or from the garage. In most cases you remove it and do not see another one for weeks.
Most of these spiders are harmless. UF/IFAS describes Florida spiders as mostly non-aggressive, shy and generally not a threat to people, and many of them help by eating insects, including mosquitoes. To learn more about the species around you, see 7 interesting facts about spiders.
Normal Spider Activity vs. a Problem: How to Tell
The difference comes down to frequency, spread and evidence of breeding. Use this table as a quick check.
| What you notice | Usually normal | Worth a closer look |
|---|---|---|
| How often | A spider every few weeks | Spiders several times a week |
| Where | One area, near a door or window | Several rooms or floors |
| Webs | Occasional, dusty, not rebuilt | Fresh webs back within days of cleaning |
| Egg sacs | None | Sacs in corners, closets, under furniture |
| Young spiders | None | Clusters of tiny spiderlings |
| Type of spider | Small hunters or cellar spiders | Widow spiders near doors, furniture, play areas |
| Other insects | Rare | Roaches, flies, ants or crickets indoors |
| After cleaning | Spiders stay away | Spiders return within days |
One item in the right column is a reason to pay attention. Several at once, especially egg sacs plus spiders in multiple rooms, mean spiders are living and reproducing inside your home.
The Signs, One by One
- Fresh webs that keep returning. A spider rebuilds in the same spot only if it keeps catching prey there. Our guide to what spider webs around your home mean explains how to read them.
- Spiders in several rooms. This suggests conditions favor spiders throughout the house, not just at one entry point.
- Egg sacs. A sac means a spider has settled in to breed. The University of Kentucky notes that each sac can hold hundreds of young spiders.
- More insects indoors. If you are also seeing roaches, flies or ants, the spiders have a food source inside.
- Spiders returning soon after cleaning. Removing spiders without removing their food and shelter brings them back.
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Which Spiders Are Actually Dangerous in Florida?
This is the question behind most spider worries, and the answer is short. According to UF/IFAS, widow spiders are the only spiders native to or established in Florida with medically significant venom, meaning a bite could require medical care.
Widow Spiders
Florida has four widows: the southern black widow, northern black widow, brown widow and red widow. The red widow lives in scrub habitat and is rarely seen around homes. Around houses you are most likely to meet the black and brown widows.
- Southern black widow: the female is shiny black with a red hourglass under the abdomen. UF/IFAS says it lives in woodpiles, rock piles, rodent burrows and hollow stumps outdoors, and in garages, sheds and outbuildings.
- Brown widow: tan to dark brown with an orange to yellow-orange hourglass. It builds in plant pots, mailboxes, eaves and under outdoor chairs, and its egg sac is covered in small spikes.
Widows are shy. UF/IFAS notes that most black widow bites happen when people reach under objects where the spider lives, put on shoes not worn recently or go through old boxes. Brown widows are very timid, do not defend their webs, usually bite only when accidentally pressed against skin and inject less venom than black widows.
What About the Brown Recluse?
Many Floridians believe brown recluses are common here. They are not. UF/IFAS reports that no breeding populations of any recluse spider have been found in Florida. About 20 verified specimens have turned up, all in buildings or vehicles, likely carried in with travelers or cargo. The spider usually mistaken for one is the male southern house spider, which is light brown and long-legged but harmless.
| Spider | Dangerous? | Where you see it | Key feature |
|---|---|---|---|
| Southern black widow | Yes, seek care if bitten | Garages, sheds, woodpiles | Shiny black, red hourglass |
| Brown widow | Yes, but timid | Planters, mailboxes, outdoor furniture | Orange hourglass, spiky egg sac |
| Southern house spider | No | Window corners, eaves, cracks | Males light brown, long legs; messy webs |
| Cellar spider | No | Ceilings, closets, sheds | Very long thin legs, loose webs |
| Wolf spider | No | Floors, garages, lawns | Hunts without a web, carries egg sac |
| Golden silk spider | No | Large webs in trees | Huge golden web, late summer and fall |
When Spiders Are a Sign of Another Pest Problem
Spiders do not come indoors for crumbs or garbage. They come for prey. If spiders keep turning up, the more useful question is what they are eating.
Common answers in South Florida homes include cockroaches, flies breeding in drains or trash, ants, crickets and silverfish. Moths and gnats drawn to lights near doors also feed the spiders waiting at the entrance. If you are seeing any of these, address them first; the spider population usually drops on its own once the food runs short. Our cockroach library is a good place to start if roaches are part of the picture, and are spiders a sign of a bigger pest problem covers the connection in depth.
Don’t Ignore Outdoor Activity
What happens outside often predicts what happens inside. Watch the entryways, patios, garage door and exterior lights. When outdoor webs multiply over a few weeks, insect numbers around the property are probably rising, and spiders that live near your doors will follow those insects inside.
The garage deserves special attention because it connects directly to the house and is full of quiet storage. If spiders seem to start there, read when spiders take over your garage.
What You Can Do Right Now
These steps reduce spiders and the insects they feed on:
- Vacuum spiders, webs and egg sacs, then seal and discard the bag.
- Declutter closets, garages and storage areas, and move items into sealed plastic bins.
- Seal entry points with door sweeps, screen repairs and caulk around windows and utility lines.
- Change outdoor lighting to yellow or sodium vapor bulbs at entrances, as the University of Kentucky suggests, so fewer insects gather at your doors.
- Trim plants so shrubs and branches do not touch the house.
- Shake out shoes, gloves and clothing stored in the garage before you use them. The CDC recommends this for anyone handling stored items.
- Use glue traps along walls to see where spiders travel.
Skip foggers. The University of Kentucky notes that total-release “bug bombs” are seldom effective against spiders, and they do nothing about the insects or gaps behind the problem.
When to Call a Professional
Call for an inspection if you find egg sacs or spiderlings, see spiders in several rooms, find widow spiders near doors, furniture or play areas, or keep seeing spiders after you have cleaned and sealed. It also makes sense to call if other pests are clearly feeding them.
Toro has protected South Florida homes since 1969. Our residential pest control services include Total Home Protection Gold 365, an every-other-month service inside and outside your home that includes removing spider nests outside the house, and it starts with a free inspection. For businesses, see our commercial pest control services. Browse the spider pest library to identify what you have seen.
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305-594-4767Frequently Asked Questions
How do I know if I have a spider infestation?
Are there brown recluse spiders in South Florida?
What does a widow spider bite feel like?
Are spiders in the house dangerous to dogs and cats?
Do spiders lay eggs in beds?
Sources
- An Introduction to Some Common and Charismatic Florida Spiders, UF/IFAS Extension
- Is it true that there are brown recluse spiders in Florida?, UF/IFAS Entomology and Nematology Department
- Southern Black Widow, Latrodectus mactans (Fabricius) (Arachnida: Araneae: Theridiidae), UF/IFAS Extension
- Brown Widow Spiders, UF/IFAS Extension Sarasota County
- Venomous Spiders at Work, Centers for Disease Control and Prevention (NIOSH)
- Eliminating Spiders Around Homes and Buildings, University of Kentucky Entomology
Educational content. This article is for general information about pests in South Florida and is not medical, legal or professional advice. If you have a bite, sting or allergic reaction, contact your doctor; in an emergency, call 911. Pest problems vary from home to home, so a licensed professional should inspect before treatment. When using any pesticide, always read and follow the product label.
