The most effective way to stop mosquitoes from biting you is to use an EPA-registered repellent containing DEET, picaridin, or oil of lemon eucalyptus, combined with physical barriers like long clothing and fans. But the best strategy layers multiple approaches, from what you put on your skin to what you wear, where you sit, and how you manage your yard.
Repellents That Actually Work
The EPA currently registers eight active ingredients for skin-applied mosquito repellents: DEET, picaridin, IR3535, oil of lemon eucalyptus (and its active compound PMD), catnip oil, oil of citronella, and 2-undecanone. Not all of these perform equally. The top tier for long-lasting protection includes DEET, picaridin, and oil of lemon eucalyptus.
Picaridin at 20% concentration protects against mosquitoes for 8 to 14 hours. At 10%, that drops to 3.5 to 8 hours. IR3535 at 20% protects against most common mosquito species for 7 to 10 hours, though it’s less effective against certain tropical species. DEET at similar concentrations provides comparable protection times, and it remains the most studied repellent on the market.
For a plant-based option, oil of lemon eucalyptus (containing PMD) performs comparably to DEET in lab testing. It needs reapplication more frequently than the synthetics, but it’s the strongest botanical option available. Citronella, by contrast, typically provides only 30 minutes to two hours of protection and needs constant reapplication to be useful.
When applying any repellent, spray it on exposed skin and on top of clothing, not underneath. Reapply after swimming or heavy sweating. You can use repellent and sunscreen together, but apply sunscreen first and repellent on top.
What You Wear Matters More Than You Think
Mosquitoes can bite through thin, tight-fitting fabric. Loose-fitting long sleeves and pants made from tightly woven material create a real physical barrier. But color matters too.
Research from the University of Washington found that after detecting the carbon dioxide you exhale, mosquitoes fly toward specific colors: red, orange, black, and cyan. They largely ignore green, purple, blue, and white. This happens because human skin, regardless of pigmentation, emits a long-wavelength signal in the red-orange range. When researchers filtered out those wavelengths or covered skin with a green glove, mosquitoes lost interest. So wearing lighter colors in green, blue, purple, or white gives you a genuine, if modest, advantage.
For serious outdoor time, treating your clothes with permethrin adds another layer of defense. Permethrin is an insecticide that bonds to fabric fibers and kills or repels mosquitoes on contact. If you treat clothing yourself with a spray-on product, expect it to last about five to six washes or roughly six weeks of wear. Washing treated clothes gently by hand and as infrequently as possible extends that lifespan. Factory-treated clothing from brands that build permethrin into the fabric lasts significantly longer, often through 70 or more washes. Never apply permethrin directly to skin.
Use a Fan When You’re Sitting Outside
Mosquitoes are weak fliers. They struggle in winds above 10 to 12 miles per hour, which is roughly what a standard box fan or oscillating pedestal fan produces on its medium or high setting. Pointing a fan at your seating area does two things: it physically prevents mosquitoes from reaching you, and it disperses the plume of carbon dioxide and body odors that attract them in the first place. A large-bladed fan on high speed outperforms a small desk fan. If you eat dinner on a patio, this is one of the simplest and most underrated defenses available.
Eliminate Breeding Sites in Your Yard
Female mosquitoes lay eggs in standing water, and some species need as little as a bottle cap’s worth. Walk your property once a week and dump anything holding water: plant saucers, clogged gutters, old tires, buckets, tarps with puddles, and kids’ toys left in the yard. Change the water in birdbaths every few days.
For water features you can’t drain, like rain barrels, ornamental ponds, or drainage ditches, mosquito dunks containing a naturally occurring bacteria called BTI kill mosquito larvae without harming fish, pets, birds, or other wildlife. Each dunk lasts about 30 days before you need to replace it. They’re available at most hardware and garden stores.
Timing and Location
Most mosquito species are most active at dawn and dusk, though some (particularly the species that carries dengue and Zika) bite aggressively during the day. If you’re outdoors during peak hours, that’s when layering repellent, clothing, and a fan together pays off most.
Mosquitoes rest in shady, humid spots during the heat of the day. Trimming tall grass and shrubs near your home, especially around seating areas, reduces the number of adults lurking nearby. They also congregate near standing water sources, so positioning your outdoor hangout away from ponds, marshes, or ditches helps.
Repellents for Kids and Pregnancy
DEET is the most studied repellent during pregnancy. A randomized, double-blind trial of 897 pregnant women in Thailand found no adverse effects when therapeutic doses were applied during the second and third trimesters. Picaridin and IR3535 are also considered safe during pregnancy.
For children, DEET and picaridin can be used on kids over two months old. Oil of lemon eucalyptus is the exception: the CDC recommends against it for children under three years old. For infants under two months, skip repellents entirely and use mosquito netting over carriers and strollers instead. When applying repellent to older children, spray it on your own hands first and then rub it on the child’s skin, avoiding their hands, eyes, and mouth.
What Doesn’t Work
Vitamin B1 (thiamine) supplements are one of the most persistent mosquito myths. A comprehensive scoping review of 22 experimental reports found that thiamine does not repel mosquitoes at any dosage or by any route of administration. Every well-controlled study reached the same conclusion: no effect. The FDA declared all oral insect repellents, including thiamine, “not generally recognized as safe and effective” back in 1985. Garlic supplements have a similarly thin evidence base.
Ultrasonic repellent devices, citronella candles (as opposed to applied citronella oil), and wristbands infused with repellent have all performed poorly in independent testing. Candles and wristbands may create a tiny zone of reduced landing near the source, but they don’t provide meaningful whole-body protection. Bug zappers attract and kill many insects, but mosquitoes make up a small fraction of their catch, and the light can actually draw more mosquitoes into your yard.
The most reliable approach combines a proven repellent on your skin, sensible clothing choices, and environmental controls like fans and standing water removal. No single method is perfect, but stacking several together makes you a far less appealing target.