Every year around this time I get the same question from customers in Boca Raton and Fort Lauderdale: can I cancel after September? The thinking is reasonable. The rain lets up and it feels like the problem should solve itself. But South Florida mosquito season does not run on the rain calendar, and the mosquito that matters most does not need a rainstorm to breed.
The rain has an end date. The mosquitoes do not.
The National Weather Service in Miami uses fixed dates for South Florida's wet season, May 15 to October 15, regardless of what the weather actually does that year (Source: NWS Miami rainy season documentation, via Miami New Times and NBC 6 South Florida). That is a rainfall bookkeeping date. It is not a mosquito date, and treating it like one is where people get caught.
Here is the part that matters. Aedes aegypti, the mosquito behind dengue transmission in Florida, is a container breeder. It lays eggs in water held in containers, on plant stems in water, or on damp soil, and it can use a container as small as a bottle cap. Its eggs resist drying and can survive six months or more, then hatch once water covers them again (Source: CDC Aedes aegypti fact sheet).
That changes what you do in October. Your yard does not need a daily thunderstorm to produce mosquitoes. It needs a saucer under a potted plant, a clogged gutter, a tarp with a dip in it, or a toy left upright. A sprinkler cycle or one passing shower is enough to flood eggs that have been sitting dry since August.
What the state's numbers actually say this week
Florida has recorded 152 locally acquired dengue cases in 2026 so far, the second highest total on record behind the roughly 200 reported in 2023 (Source: Florida Department of Health data, reported Sept 17, 2026, WTSP). Forty-one of those were reported in a single week, Sept 6 to 12.
Now the part the headlines usually skip. Of those 152 locally acquired cases, 134 are in Hillsborough County, 7 in Pinellas, and 2 in Pasco, and Tampa Bay area counties account for 143 of the 152 total (Source: same DOH data, Sept 17, 2026). Subtract that and fewer than ten locally acquired cases are spread across the entire rest of the state. This year's local outbreak is a Tampa Bay story, not a South Florida one, and I would rather tell you that than scare you with a statewide number.
Separately, Florida has 186 travel associated dengue cases in 2026 (Source: same DOH data, Sept 17, 2026). Those are infections caught outside Florida. They are a different surveillance category and they do not indicate local transmission where the patient lives.
As for county status, the state's arbovirus surveillance report for week 36, Sept 6 to 12, 2026, lists Duval, Hillsborough, Miami-Dade, and Pinellas counties under a mosquito borne illness alert (Source: Florida Arbovirus Surveillance, week 36, Sept 6-12, 2026). As of the Aug 29, 2026 status, Palm Beach was under an advisory, which is the lower tier (Source: Florida Arbovirus Surveillance, as of Aug 29, 2026). Broward appears on neither list in those reports.
What to actually do over the next four weeks
Walk the yard once a week and dump anything holding water. Gutters, saucers, birdbaths, pet dishes, tarps, wheelbarrows, boat covers, bromeliads. A capful counts. This is free and it is still the highest value thing a homeowner can do.
On the professional side, keep the two tools straight, because they do different jobs and the difference matters more in the shoulder season, not less:
A barrier treatment kills adult mosquitoes on contact and on treated foliage, with protection generally running 10 to 17 days depending on rain and new growth. It is a control product, it kills, and it is not a natural product. We apply it label directed, and it contains no neonicotinoids.
In2Care style stations work the other end of the life cycle, using a natural based biological larvicide against breeding containers before those mosquitoes mature into biting adults. Against a container breeder whose eggs are sitting dry in your yard right now waiting for water, that is exactly the right tool for October.
Bottom line
October is when people stop paying attention and the eggs are still there. The rain has a scheduled end date. The mosquito laying eggs in the saucer behind your garage does not. If you want a set of eyes on your yard before the shoulder season, give us a call or fill out the form on our site.
Sources are cited inline. Questions about your own property? Call 561-443-3333 or request a free quote.