Common House Bugs in Florida: What You Will See and When
The most common house bugs in Florida are large outdoor cockroaches (American, Australian and smokybrown, all called palmetto bugs), the indoor German cockroach, small sweet-feeding ants such as ghost ants and white-footed ants, Florida carpenter ants, fire ants, and three structural termites: Formosan, Asian subterranean and West Indian drywood. Seasonal flyers fill in the rest: lovebugs in spring and late summer, no-see-ums and container-breeding Aedes mosquitoes. Most of these are nuisances that good sealing and baiting handle. Termites and German cockroaches are the two that usually need a licensed professional.
Several of Florida’s worst house pests are tropical species that arrived by ship or in nursery plants. This guide sorts them by what you are seeing, uses University of Florida IFAS Featured Creatures profiles for sizes and timing, and adds our own count of what Floridians photograph.
Florida’s house bugs at a glance
| Bug | Size | Where you usually see it | Peak timing in Florida | DIY or professional |
|---|---|---|---|---|
| American cockroach | About 40 mm (1.5 in) | Bathrooms, garages, drains, after migrating from sewers or trees | Year round, worse in summer | DIY sealing and bait usually enough |
| Australian cockroach | 32 to 35 mm | Outdoors under bark, woodpiles; strays inside | Year round in south Florida | DIY exclusion |
| Smokybrown cockroach | 25 to 32 mm | Tree holes, attics, flies to lit openings | Warm months | DIY exclusion |
| German cockroach | 13 to 16 mm | Kitchens, then bathrooms | Year round indoors | Professional, in most homes |
| Ghost ant | 1.3 to 1.5 mm | Sinks, counters, bathroom floors | Year round | DIY bait |
| White-footed ant | 2.5 to 3 mm | Trails up exterior walls, kitchens, bathrooms | Year round | Bait; large colonies often need a pro |
| Florida carpenter ant | 5.5 to 11 mm workers | Kitchens and bathrooms at night; swarmers at windows | Swarm complaints April to June | DIY or pro, depending on nest |
| Red imported fire ant | 2.4 to 6 mm | Lawn mounds, slab edges, indoors after heavy rain | Spring to fall flights | DIY broadcast bait |
| Formosan subterranean termite | 12 to 15 mm swarmers | Swarms at lights after sunset | Early April to late June, peak May | Professional |
| West Indian drywood termite | Pellets and wings on sills | Furniture, attics, window frames | Flights April to June | Professional |
| Lovebug | 6 to 9 mm | Roads, cars, porches | April to May and August to September | No treatment needed |
| No-see-ums | 1 to 2 mm | Coastal and wooded yards, through screens | Dusk, night and morning | Personal protection |
Cockroaches: the big ones mostly live outside
Most of the large cockroaches Floridians find indoors are peridomestic species, meaning they live outdoors and wander in. UF/IFAS describes the American cockroach as the largest of the common species, averaging 4 cm (1.5 in), and notes that it occurs in buildings throughout Florida and migrates into homes from sewers via plumbing and from trees and shrubs beside the house.
The Australian cockroach is, according to UF/IFAS, the most common cockroach species found outdoors in southern Florida. It looks like the American cockroach but has light yellow bands on the outer edges of the forewings. Adults are about 32 to 35 mm long. UF/IFAS notes that a gap under a door the width of a quarter is enough to let one in.
The smokybrown cockroach is 25 to 32 mm (1 to 1.25 in), uniformly dark mahogany to black, and a good flier attracted to light. UF/IFAS says it is abundant outdoors in tree holes, woodpiles and attics and readily enters through lit openings. It, too, is often called a palmetto bug; our guide to what a palmetto bug actually is sorts out which species the name covers and why it matters.
The one that changes the plan
The German cockroach is different in kind, not just size. At 13 to 16 mm (about half to five-eighths of an inch) with two dark stripes behind the head, it lives in close contact with people, preferring kitchens and then bathrooms. UF/IFAS calls it the most important pest cockroach in the United States. Small striped cockroaches in the kitchen usually mean an established indoor population, and that is normally a job for a licensed professional rather than a can of spray.
Ants: tiny trails, big colonies
The ant species matters because the effective treatment differs. Our ant identification guide covers the general features; these four are the Florida specialists.
Ghost ants
Ghost ant workers are only 1.3 to 1.5 mm long, with a dark brown head and thorax and a milky white abdomen and legs. UF/IFAS says that in Florida they are mostly found from Sarasota to Orlando and south, and considers them one of the most important household ant pests in the state. Foragers turn up on sinks, counters and floors, and crushed workers smell of rotten coconut. Sweet baits placed on trails, checked after a day or two and moved if ignored, are the method UF/IFAS describes.
White-footed ants
White-footed ants are 2.5 to 3 mm, black to brownish black with pale yellowish white feet. They do not bite or sting and cause no structural damage, but colonies range from 8,000 to 3 million individuals. UF/IFAS research in Fort Lauderdale found baits to be the only effective method in laboratory tests, and stresses trimming vegetation off the house, since the ants trail from shrubs onto walls and into soffit vents.
Florida carpenter ants
These large, bicoloured ants (workers 5.5 to 11 mm) account for roughly 20 per cent of homeowner ant complaints in a survey of four Florida metro areas cited by UF/IFAS. Unlike the black carpenter ant of the panhandle, UF/IFAS says Florida carpenter ants nest in existing voids or excavate only soft materials such as rotten wood and foam. They forage mostly at night and bite, though they do not sting. Swarm complaints peak from April to June, when winged ants at windows are often mistaken for termites; our guide to telling termites from flying ants gives the three-point check.
Fire ants
Red imported fire ants arrived through Mobile or Pensacola between 1933 and 1945 and are now one of two fire ant species in Florida. Workers range from 2.4 to 6 mm, mounds are seldom more than 18 inches across, and a sting usually leaves a white pustule the next day. After heavy rain a colony may move inside homes to escape saturated soil. USDA APHIS lists Florida among the states infested with imported fire ants, which are regulated under a federal quarantine; our fire ant quarantine guide explains what that does and does not mean for a homeowner, and the two-step bait method that works better than treating mounds one by one.
Termites: Florida has three to worry about
All three of Florida’s main structural termites are a professional job.
- Formosan subterranean termite. Distributed throughout Florida, mainly in densely populated urban areas, according to UF/IFAS. Swarmers are 12 to 15 mm, orange to light amber brown with hairy wings. In Florida they typically swarm between early April and late June, shortly after sunset, with peak activity in May, and flights can contain tens of thousands of individuals. UF/IFAS states that control requires professional services and over-the-counter products are unlikely to work.
- Asian subterranean termite. First found in the continental US in Miami in 1996 and since established in Broward and Palm Beach counties. Its swarms happen at dusk or night between February and April, ending about when the Formosan season begins.
- West Indian drywood termite. Lives entirely inside dry wood, including furniture and structural timber, and pushes small fecal pellets out of kick-out holes about 1 to 2 mm across. UF/IFAS says nearly all structural fumigation in Florida is for this species, costing an estimated $140 million a year in the state. Flights run from April to June.
Where Florida sits on the building code’s termite map, and why the Formosan and drywood species need maps of their own, is covered in our termite zones map, along with what the code requires of builders.
Flying bugs in Florida
Indoors, most flying insects are swarming termites and ants. Outside, three others account for most complaints.
Lovebugs
Lovebugs are small black flies with a red thorax, 6 to 9 mm long. UF/IFAS describes two generations a year in Florida, each about four weeks long, in April to May and August to September. They are a nuisance to drivers, not a house pest.
No-see-ums
Biting midges are usually 1 to 2 mm long; UF/IFAS says Florida has about 50 species and diversity is greatest in the northern half of the state. Most bite at dusk, night or morning. UF/IFAS notes that regular window screen does not keep them out.
Mosquitoes
Around the house, the two mosquitoes to know breed in containers. The Asian tiger mosquito, which UF/IFAS describes as a daytime feeder, was first found in Florida at a tire dump near Jacksonville a year after its 1985 US detection in Texas, and it breeds in flowerpot saucers, bird baths, tires and gutters. The yellow fever mosquito, Aedes aegypti, has declined since but still thrives in urban south Florida. Emptying standing water is the main control; for disease questions, the Florida Department of Health and CDC are the authorities. If you are weighing a yard service, our mosquito control cost guide covers what a season of treatment involves.
Black bugs in Florida
When Floridians search for small black bugs, the usual answers are:
- Lovebugs, black with a red thorax, in spring and late summer swarms.
- White-footed ants, black with pale feet, trailing along walls.
- Smokybrown cockroaches, very dark mahogany, near lights at night.
- Millipedes, wormlike and many-legged, which UF/IFAS says cause no damage indoors; a broom and dustpan are enough.
- Widow spiders, including the southern black widow. Florida also has the brown widow, red widow and northern black widow. UF/IFAS notes the brown widow has more potent venom than North American black widows but is more timid and releases less venom when it bites. Any suspected widow bite is a matter for a doctor.
The odd ones Floridians find
Household casebearers leave flat, spindle-shaped cases that resemble a pumpkin seed on walls, mostly in south and central Florida. The larvae mainly eat old spider webs, and vacuuming is usually enough.
Silverfish favour humid, hidden spaces such as bathrooms and attics at 72 to 81°F and eat starchy materials like glossy paper; our guide to silverfish and other moisture pests goes further.
Scorpions are less common than people fear. UF/IFAS lists the Hentz striped scorpion, slender brown scorpion and Keys bark scorpion as the most observed species in Florida, and says the state’s scorpions are not known to cause significant medical issues; stings are compared to a bee or wasp sting.
Geckos on the porch at night are not pests themselves; our lizard and iguana guide explains why a crowd of them around a porch light points to an insect problem first.
What Floridians actually photograph
We counted iNaturalist research-grade records in Florida for a fixed list of household pest taxa. These are photographed and identified sightings, mostly outdoors, so they show how often each animal is noticed, not how many homes are infested.
Millipedes lead with 17,342 records, followed by carpenter ants at 14,001 and the Asian lady beetle at 10,322. Red imported fire ants (4,723) and lovebugs (4,122) come next. Two details stand out. Australian cockroach records (1,636) outnumber American cockroach records (1,475), consistent with UF/IFAS calling the Australian the most common outdoor cockroach in south Florida. And the German cockroach has only 183 records against 1,475 for the American, most likely because it lives indoors, where few people stop to photograph it.
When DIY is enough, and when to call
- Large cockroaches from outside: door sweeps, sealed plumbing gaps, woodpiles moved away from walls, and labelled baits. Usually enough.
- Ghost ants and white-footed ants: baits on active trails and vegetation trimmed off the house; UF/IFAS lab tests found baits the only effective method for white-footed ants. Persistent white-footed ant problems often need a professional because of colony size.
- Fire ants: broadcast bait, then treat problem mounds, following the label.
- German cockroaches: usually a professional job once established.
- Termite swarmers, mud tubes or pellet piles: save a specimen and call a licensed termite company for an inspection. UF/IFAS is explicit that retail products are unlikely to control Formosan termites.
Follow the label on any product, and do not rely on foggers.
Frequently asked questions
What are the most common bugs in Florida homes?
The ones Floridians meet most often indoors are large outdoor cockroaches such as American, Australian and smokybrown cockroaches, small ants such as ghost ants and white-footed ants, Florida carpenter ants foraging at night, and the indoor German cockroach. UF/IFAS considers the ghost ant one of the most important household ants in the state, and termite swarmers appear each spring.
When do termites swarm in Florida?
It depends on the species. UF/IFAS says Formosan subterranean termites typically swarm between early April and late June shortly after sunset, peaking in May. Asian subterranean termites fly at dusk or night from February to April. West Indian drywood termites fly from April to June. A swarm indoors is a reason to call a licensed termite professional for an inspection.
What are the little black flying bugs in Florida?
Small black flies with a red thorax, often flying joined in pairs, are lovebugs. UF/IFAS describes two main flights in Florida each year, in April to May and August to September. They do not bite and are mainly a nuisance to drivers. Tiny biting specks at dusk near the coast are more likely no-see-ums, which pass through standard window screen.
Are palmetto bugs the same as cockroaches?
Yes. Palmetto bug is a regional name for several large cockroaches, chiefly the American, Australian and smokybrown cockroaches. They mostly live outdoors in trees, mulch and woodpiles and wander indoors, so sealing gaps and reducing outdoor harborage usually controls them. The smaller German cockroach is a different, indoor species that normally needs professional treatment.
Does Florida have dangerous scorpions?
UF/IFAS says the scorpions found in Florida are not known to cause significant medical issues. The most observed species are the Hentz striped scorpion, slender brown scorpion and Keys bark scorpion. A sting is painful and has been compared to a bee or wasp sting, with redness and swelling usually clearing within hours. Anyone with a severe reaction should seek medical care.
Sources
- UF/IFAS Featured Creatures, Formosan Subterranean Termite, Coptotermes formosanus (EDIS IN278, revised 2025).
- UF/IFAS Featured Creatures, Asian Subterranean Termite, Coptotermes gestroi (EENY128, EDIS IN285).
- UF/IFAS Featured Creatures, West Indian Drywood Termite, Cryptotermes brevis (EDIS IN236, 2020).
- UF/IFAS Featured Creatures, American Cockroach, Periplaneta americana (EDIS IN298).
- UF/IFAS Featured Creatures, Australian Cockroach, Periplaneta australasiae (EDIS IN1088).
- UF/IFAS Cockroach Photographs, smokybrown cockroach and German cockroach species pages.
- UF/IFAS Featured Creatures, Ghost Ant, Tapinoma melanocephalum (EENY310, EDIS IN532).
- UF/IFAS Featured Creatures, White-footed Ant, Technomyrmex difficilis (EENY273, EDIS IN551).
- UF/IFAS Featured Creatures, Florida Carpenter Ant, Camponotus floridanus (EENY272, EDIS IN455).
- UF/IFAS Featured Creatures, Red Imported Fire Ant, Solenopsis invicta (EDIS IN352).
- UF/IFAS Featured Creatures, Lovebug, Plecia nearctica (EDIS IN204).
- UF/IFAS Featured Creatures, Biting Midges, No-See-Ums, Culicoides spp. (EDIS IN626, 2025).
- UF/IFAS Featured Creatures, Asian Tiger Mosquito, Aedes albopictus (EDIS IN594) and Yellow Fever Mosquito, Aedes aegypti (EDIS IN792).
- UF/IFAS Featured Creatures, Southern Black Widow, Latrodectus mactans (EDIS IN1000).
- UF/IFAS Featured Creatures, Household Casebearer, Phereoeca uterella (EENY003, EDIS IN129).
- UF/IFAS Featured Creatures, Silverfish, Lepisma saccharina (EDIS IN1211).
- UF/IFAS Extension, Pillbugs, Sowbugs, Centipedes, Millipedes, and Earwigs (ENY-221, IG093).
- UF/IFAS Extension Sarasota County, The Spooky Bug Brigade: Scorpions, 2024.
- The Pest Control Brief analysis of iNaturalist research-grade records, pulled October 2026.
