Bottom line: South Florida peak mosquito season is May through October, with July and August being peak pressure. But activity never stops — canal-front and lakefront properties see meaningful mosquito activity 12 months a year.
Why South Florida Is Different
In most of the US, mosquito season follows a predictable arc. South Florida does not work that way. We have no killing frosts, year-round water sources including 165 miles of canals in Fort Lauderdale alone, a rainy season (May through October) with 60+ inches of annual rainfall, and the delayed hatch phenomenon where dormant eggs can hatch en masse after trigger rain events.
The result: homeowners who care about using their outdoor spaces need mosquito control 12 months a year, not 6.
Month-by-Month Mosquito Pressure
Coolest and driest month. Mosquito activity at its lowest but does not stop. Warm days (70F+) bring activity, especially near water. Canal-front and lakefront properties still see meaningful pressure in January.
Similar to January. Warming begins mid-month. Breeding activity increases as water temperatures rise. Early spring break visitors are often surprised by mosquito activity.
Temperatures warming. Breeding activity increases. Mosquito eggs dormant since fall begin hatching. Ideal time to start seasonal service before populations build.
Pre-rainy season. Significant activity especially on warm humid evenings. The delayed hatch phenomenon begins. Start service now if you have not already.
Rainy season begins. Afternoon thunderstorms dramatically accelerate breeding. Mosquito populations surge. Properties in Parkland, Coral Springs, and western communities see the sharpest increases.
Full rainy season. Daily afternoon storms. Mosquito populations near peak. Canal systems, lakes, and retention ponds at capacity. Outdoor entertaining becomes difficult without professional control.
Maximum mosquito pressure. Rainfall, humidity, and heat all at maximum. Adult populations at their annual high. Properties near water see all-day activity, not just dusk and dawn.
Ties with July for maximum pressure. Accumulated breeding from months of rain means enormous egg banks in soil and vegetation. Even a missed spray visit results in noticeable population rebound.
Still peak rainy season but temperatures begin moderating late in the month. Pressure remains very high. Hurricane and tropical storm activity can trigger sharp spikes as storm water creates new breeding sites.
Rainy season ends, but populations remain high from summer breeding. Many residents make the mistake of canceling service too early in October.
Pressure begins declining meaningfully. Drier conditions reduce new breeding but existing adults remain active. Activity concentrated in the evening and near water.
Lowest pressure of the year but not absent. Mosquitoes remain active on warm winter days. Canal-front and preserve-adjacent properties see persistent pressure even in December.
When to Start Mosquito Control Service
Barrier builds before peak season. 80%+ control established by June.
You will get results but need 3-4 visits to reach full control.
Waterfront and preserve-adjacent homes often benefit from year-round service.
Frequently Asked Questions
When is mosquito season in South Florida?+
South Florida's peak mosquito season runs from May through October, coinciding with the rainy season. However, mosquito activity never fully stops — even January through March sees activity on warm days, which in South Florida is most days. Effective control requires year-round attention, not just summer treatment.
What month has the most mosquitoes in South Florida?+
August and September typically have the highest mosquito pressure in Broward and Palm Beach counties. These months combine maximum rainfall, peak temperatures, and the accumulated effect of months of breeding.
Do mosquitoes go away in winter in South Florida?+
No, not in any meaningful sense. South Florida winters rarely drop below 60F, which is not cold enough to kill mosquitoes. Activity slows on cooler days but resumes immediately when temperatures rise. Most residents find mosquitoes active on outdoor patios even in January.
When should I start mosquito control service in South Florida?+
For optimal results, start service before peak season in March or April. The barrier spray strengthens with every visit, so starting before the May-June surge means you have 80%+ control established by the time peak season hits.
Eric holds a B.S. from Penn State, an MBA from Rollins College, and completed Pest Control Technology at the University of Florida. Florida License JB313837, all 5 categories.