In most of the country, pest season means summer. Things wake up in spring, peak in July, and die back with the first freeze.
South Florida does not get the freeze, so nothing resets. What we get instead is a set of overlapping cycles, each one driven by something different. Termites follow rain and temperature. Mosquitoes follow standing water. Roof rats follow fruit. Fleas barely follow anything at all.
Knowing which month belongs to which pest is the difference between treating a problem and preventing one.
The short version
Spring, roughly February through May, is termite swarm season and the single most consequential window on this calendar.
The wet season, June through October, is peak mosquito pressure and the months when most mosquito-borne illness activity is reported in Florida.
Summer is worst for American roaches and palmetto bugs, which move indoors when outdoor conditions get extreme in either direction.
Fleas, German roaches, silverfish and ghost ants have no real off-season here. They are indoor pests living in climate-controlled conditions year-round.
This is the one to plan around. Subterranean termites swarm in spring, and a swarm is not the start of a problem. It is a mature colony announcing itself, often after years underground.
Different species swarm at different points in that window and at different times of day, which is why you may see one swarm in March and another in May. Drywood termites swarm later, generally into the warmer months, and behave differently because they live inside the wood rather than in soil.
The practical point is that treatment decisions made during swarm season are made under pressure, with a visible problem and a homeowner who wants it solved today. Decisions made in December are made calmly. Our guide on termite prevention covers what to do ahead of the season.
The wet season is the whole story. Mosquito populations track standing water, and the afternoon storms that define South Florida summer refill every container on a property every few days.
This is also when arbovirus activity is reported. The Florida Department of Health publishes weekly arbovirus surveillance, and locally acquired case counts in 2026 have concentrated in the summer months.
The species that matter most around houses are container breeders. They are not coming from the canal at the end of the street, they are coming from the plant saucer on your patio.
Peak heat and peak rain both push them indoors, which is why the calls cluster in summer.
American roaches live outdoors by preference, in mulch, sewers, tree holes and palm debris. Heavy rain floods those harborages and drives them toward structures. Extended dry heat does the same thing for a different reason, sending them looking for moisture.
They are the large ones people find in the garage or coming up a drain, and they are generally an entry problem rather than an infestation problem. Our roach identification guide covers the difference.
There is no cold snap driving rodents indoors here, so the pressure shift comes from food and landscape rather than temperature.
Fruit tree cycles move them. Landscape work displaces them. The dry season starting in November makes outdoor water less reliable and irrigation lines more attractive. Holiday cooking, garbage volume and cardboard in the garage all feed an existing problem.
Seasonal residents closing up a house in spring and returning in fall find the worst of it, because a population that establishes in September has months to grow with nobody in the house.
Tick activity in Florida runs year-round, with activity generally increasing through the warmer months. Unlike northern states, there is no winter window where the risk drops to nothing.
Yard conditions matter more than season. Shaded mulch beds, tall grass along fence lines, leaf litter and dense landscaping hold humidity, and that is where ticks wait. Properties near canals, retention ponds or equestrian facilities carry more pressure than the calendar alone would suggest. Our tick library page covers the species found here.
Fleas.
Florida's climate supports fleas year-round, and the indoor environment is stable regardless of what the weather does. Most of a flea population is eggs, larvae and pupae in carpet and bedding rather than adults on a pet, which is why the problem persists through months that feel like they should be quiet.
German roaches.
They live entirely indoors, in kitchens and bathrooms, at a temperature that never changes. They also arrive by hitchhiking in boxes, bags and secondhand appliances rather than by walking in from outside, so the season that matters is whenever something came into the house.
Ghost ants.
Warm and wet conditions favor them, and South Florida supplies both nearly all year. Their colonies nest in potted plants, mulch and wall voids, and irrigation keeps those sites viable through the dry months.
Silverfish.
They need humidity, not warmth, and bathrooms, laundry rooms and storage closets provide it in January as readily as in August. Our silverfish page covers what they damage and how long they live.
The useful move is to work about six to eight weeks ahead of each window rather than inside it.
Termite prevention decisions belong in December and January, not March. Mosquito yard work belongs in May, before the rain starts refilling containers weekly. Rodent exclusion belongs in August and September, before fruit cycles and landscape work start moving populations around.
Everything on the year-round list is a different kind of problem. Those are not seasonal, so there is no window to get ahead of. They get addressed when they appear, and they stay addressed only if the conditions supporting them change.
If you would rather get ahead of a season than react to one, a free inspection is the place to start. Wise House Pest Control serves Palm Beach County, Martin County, and St. Lucie County.
1177 Hypoluxo Rd Suite C-31 Lantana, FL 33462
464 NW Peacock Blvd, Unit 106 Port St Lucie, FL 34986
