No-see-ums in Florida live up to their name because you feel the bite before you spot the bug. These biting midges, sometimes called sand gnats, measure roughly 0.03 inches long: small enough to be difficult to see, and just at the edge of what's visible to the naked eye. No-see-ums are tiny, but the itchy welt left behind after a no-see-um bite is impossible to miss.
This guide explains when no-see-ums are worst, how to reduce breeding sites and get rid of no-see-ums for good, which repellents actually work, how to treat a bite once you get bitten, and when professional treatment becomes the smarter solution.
Understanding seasonal patterns helps you prepare before biting midge activity increases in your outdoor spaces.
Florida's warm weather and humid climate create ideal conditions for no-see-ums from March through November. The worst months typically fall between March and June, when temperatures climb but afternoon thunderstorms keep humidity high.
South Florida and coastal communities, from Marco Island to the Keys, often deal with year-round activity, requiring consistent seasonal pest control to manage these swarms. Calm, overcast days with little wind bring the heaviest swarms, since these weak fliers struggle in breezy conditions. That's bad news for anyone spending time outdoors around dusk, whether you're grilling poolside or a vacationer just trying to enjoy the sunset.
Unlike West Nile-carrying mosquitoes, which need standing water, no-see-ums lay their eggs in damp soil and decaying organic debris. Only females bite. They need a blood meal to produce eggs, while males live entirely on nectar and never bite anyone. Common breeding sites include:
Coastal areas from the Florida Keys to Jacksonville see the densest populations. Inland homeowners near retention ponds or poorly draining landscapes encounter them regularly too.
Reducing breeding habitat on your property is the foundation of effective no-see-um control.
Drainage issues create the moist conditions no-see-ums need to reproduce. Take these steps as part of your routine for preventing pest infestations:
Soggy mulch beds are particularly problematic, especially since heavy storms and hurricanes could bring pest problems to your yard. Consider replacing materials in shaded areas that stay damp for days after rainfall.
Because no-see-ums cannot fly against even moderate airflow, a simple fan creates an effective barrier. Position a box fan or ceiling fan at seating height on your lanai or patio. Many Florida homeowners find this approach more practical than sprays for everyday use.
Over-the-counter sprays rarely reach the soil and organic debris where larvae develop, no matter how aggressively you use them against no-see-ums. Professional treatment works differently. Some programs rely on a misting system that releases a low dose of pyrethrum on a set schedule, timed to when adult activity peaks, targeting breeding sites that consumer products can't fully address. The goal is effective no-see-um control, applied as environmentally responsibly as possible, through ongoing, preventative service rather than a one-time fix.
These insects don't nest indoors, but plenty still slip inside your home through surprisingly small openings.
Standard 16-mesh window screens have gaps large enough for no-see-ums to slip through. Upgrading to 20-mesh or finer screening on windows and doors can help reduce their entry.
Even small tears in screen enclosures become entry points. Inspect your lanai and pool cage regularly, paying attention to:
Air conditioning keeps indoor humidity low and temperatures cool, both conditions no-see-ums avoid. Save open windows for breezy afternoons rather than the calm hours around dawn and dusk when biting activity peaks.
Personal protection matters most during early morning and evening hours when female no-see-ums feed actively.
EPA-registered repellents containing DEET or picaridin¹ offer proven protection against biting midges, and they're the difference between an evening outside and constantly swatting at gnats you can barely see. After a comprehensive re-assessment, the EPA concluded that insect repellents containing DEET do not present a health concern² when used as directed. Citronella candles and most botanical sprays provide minimal relief despite popular belief.
Covering exposed skin during peak biting times cuts down on painful bites significantly. Light-colored clothing helps too, since no-see-ums show a stronger attraction to darker colors.
Sweet-smelling personal care products draw no-see-ums toward you. Switching to unscented options during peak season helps you stay off their radar outdoors.
Even with every precaution, you'll probably still get a no-see-um bite or two before the season's over. The itching is often worse than the bite itself, since it's a reaction to saliva left behind while the insect feeds, and a bite usually shows up as a small red welt that stays itchy for days.
When it comes to remedies for no-see-um bites, over-the-counter options do the job: hydrocortisone cream, calamine lotion, and aloe vera all help calm the itching. Resist the urge to scratch. Broken skin is what turns an itchy bite into an infected one.
If bites continue after every step you've tried to repel no-see-ums on your own, a trained pest control professional can inspect the property and recommend next steps. Knowing what to expect during a Florida pest control visit can help you prepare.
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Mosquitoes |
No-See-Ums |
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Breed in standing water |
Breed in moist soil and decomposing organic matter |
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Require water-focused treatments |
Require soil and debris treatments |
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Standard mosquito treatments often focus on adults |
May require targeted attention to breeding areas |
Treatments designed for one pest may not address the breeding areas of the other. Learn more about how to get rid of mosquitoes and how comprehensive biting insect programs differ.
A professional program identifies breeding sites and addresses adult insects as part of a targeted, preventative plan. Perimeter treatments are applied according to label directions, with care for families, pets, and nearby outdoor areas.
No-see-ums are a persistent nuisance of Florida life, but they don't have to dictate how you use your outdoor spaces. Combining smart prevention with professional treatment is what actually keeps them away long-term.
Truly Nolen has served Florida homeowners for over 85 years with pest solutions focused on clear communication, careful service, and dependable results. Professional treatments from a Truly Nolen mosquito control program can target breeding sites that many DIY products may not fully address. Schedule a free inspection or find your nearest Florida pest control location to discuss options for reducing no-see-um activity around your yard, pool, and everywhere in between.