The things that keep mosquitoes off a patio are mostly simple and cheap: a fan blowing across where you sit, an EPA-registered repellent on your skin, a metofluthrin device like a Thermacell for still evenings, and a weekly walk around the patio to dump standing water. Many popular fixes, like mosquito plants, bug zappers and ultrasonic gadgets, did little or nothing when researchers tested them. This guide ranks the options by what studies actually measured, explains how to set each one up, and covers the spots around a patio where mosquitoes breed and hide.
What keeps mosquitoes away from a patio? A fan pointed at the seating area, repellent such as DEET, picaridin or oil of lemon eucalyptus on exposed skin, and a metofluthrin repeller placed right next to you when the air is still. Then cut off the supply: empty anything around the patio and yard that holds water, once a week.
What doesn't work well? Potted "mosquito plants," bug zappers, ultrasonic devices and incense. Citronella candles help a little, but not much more than an ordinary candle.
What Works on a Patio, Ranked by the Evidence
| Option | What testing found | Verdict |
|---|---|---|
| Repellent on skin | EPA-registered DEET, picaridin, IR3535 and oil of lemon eucalyptus protect for hours; citronella sprays lasted 10 to 20 minutes in University of Florida tests | Works |
| Fan | Fan-made wind "strongly reduced" mosquito catches in a Michigan State field study | Works |
| Metofluthrin repeller (Thermacell, clip-on types) | About 90% fewer landings on a person sitting right next to one; much weaker a few feet away | Works close up, in still air |
| Dumping standing water | Cuts off the mosquitoes that breed in your own yard; the CDC recommends it weekly | Essential |
| Citronella candles | 42% fewer bites in one field study, but a plain candle gave 24% | Weak |
| Yard barrier spray | Reduced Asian tiger mosquitoes in an NC State neighborhood study; lasts a few weeks | Works, needs repeating |
| Mosquito plants | No reduction over 16 weeks in a 2026 field study | Doesn't work |
| Incense | 24% fewer bites, the same as a plain candle | Doesn't add much |
| Bug zappers | Biting insects were about 0.2% of what one study's zappers killed | Doesn't work |
| Ultrasonic devices | No effect in all 10 field studies in a Cochrane review | Doesn't work |
Use a Fan, and Aim It Low
A fan is the cheapest tool on this list and one of the best supported. In a Michigan State University study in a wetland, electric fans sharply cut the number of mosquitoes reaching traps baited with carbon dioxide, and the effect grew with wind speed. The researchers found the wind works mainly by scattering the carbon dioxide and body odor mosquitoes use to find you, not just by being too strong to fly through. They recommended fans "as a practical means of protecting humans or pets from mosquitoes in the backyard setting." The American Mosquito Control Association agrees that a large fan on a deck is "a low-tech solution."
- Point it across the seating area, not just at faces. Ankles and legs get bitten most at a table, and on Reddit (via Google search excerpts) one person's fix was a box fan "blowing towards everyone's legs underneath the tables."
- More air movement is better. A strong box fan or pedestal fan beats a small clip-on. For a long table, use two.
- Ceiling fans help on covered porches, but a fan near floor level covers legs better.
- Use outdoor-rated fans and cords on damp patios.
Metofluthrin Repellers (Thermacell and Clip-Ons)
These devices release a small amount of a pyrethroid called metofluthrin into the air around you. They're the best-tested area repellent for a patio:
- A 2022 study with Asian tiger mosquitoes found that sitting next to a metofluthrin emanator cut landings by 89.5% outdoors. It protected the person right beside it but not reliably people farther away.
- A 2026 Sacramento-Yolo mosquito district field study found a Thermacell E90 "consistently" lowered mosquito catches, while citronella geranium and rosemary plants did nothing.
- A 2026 review of 49 studies found these vapor repellents cut mosquito landings by roughly 57 to 62% on average.
To get those results, put the device on the table or the ground next to where people sit, not across the patio. Give it a few minutes to start working. Don't run a fan at the same time: the top answer in a recent r/MosquitoHating thread (via Google search excerpts) was "thermacell OR fans," and the science agrees, because the fan blows the repellent away. Reddit users also say they struggle in wind for the same reason. Studies have found these heated devices didn't affect honey bee foraging. Follow the label and keep refills away from children.
Repellent on Your Skin
Whatever else you use, repellent on exposed skin is the most reliable protection for the person wearing it. The CDC recommends EPA-registered products with DEET, picaridin, IR3535, oil of lemon eucalyptus (OLE), PMD or 2-undecanone. University of Florida testing found citronella-based sprays protected for only 10 to 20 minutes. If you also need sunscreen, the CDC says to put sunscreen on first and repellent on top, and to skip combination products. Don't use OLE or PMD on children under 3.
Do Citronella Candles and Torches Work?
A little, and less than most people think:
- In a Canadian field study, people next to 3% citronella candles got 42% fewer bites than people with nothing. But people next to plain, unscented candles got 24% fewer bites, so much of the effect came from the candle itself.
- Diffusers beat candles. In a 2009 study, citronella diffusers outperformed citronella candles, and geraniol and linalool did better than citronella. Outdoors, citronella diffusers repelled 22% of mosquitoes, linalool 58% and geraniol 75%.
- Formulation matters. A 2026 New Mexico State lab study of six essential-oil candles labeled as repellents found three worked strongly and three didn't. The ones that worked had higher concentrations of oils.
Some citronella candles aren't sold as repellents at all. A Reddit post with 860+ comments showed an OFF! citronella candle whose label said it wasn't intended to repel mosquitoes. If you buy one, check that the label makes a repellent claim, and treat it as a backup to a fan and skin repellent, not a replacement.
What Doesn't Work
- Mosquito plants. In a 16-week field study, potted citronella-scented geraniums and rosemary didn't reduce mosquitoes, even when trimmed weekly to release more scent. See mosquito repellent plants.
- Bug zappers. In a University of Delaware study, only 31 of 13,789 insects killed were biting flies, and the AMCA reports no difference in mosquitoes between yards with and without zappers.
- Ultrasonic repellers. A Cochrane review found no effect in all 10 field studies. See does ultrasonic pest control work.
- Incense. Citronella incense did no better than a plain candle in field tests.
- Folk sprays and soap bars. On Reddit, people swear by mouthwash, flat beer and Epsom salt sprayed on the yard, or cut-up bars of Irish Spring. We found no studies supporting these. A Virginia Tech study did find that some soaps change how attractive people are to mosquitoes, in both directions, but it didn't test Irish Spring or anything placed around a patio.
Dump the Water Around Your Patio Every Week
Patio mosquitoes in the South are often Asian tiger mosquitoes, and in a University of Georgia study they made up 95% of the mosquitoes caught in backyards. Clemson Extension notes they breed in small containers and can go from egg to adult in about a week. They don't travel far, often staying within a few hundred feet of where they hatched, so the water near your patio matters most. The CDC recommends emptying and scrubbing, turning over, covering or throwing out anything that holds water once a week. Around a patio, check:
- plant saucers and pots without drainage holes
- grill covers, folded tarps and furniture covers that hold puddles
- buckets, watering cans, toys and kiddie pools
- birdbaths (change the water weekly)
- clogged gutters and downspout extensions
- low spots in pavers and the area under the deck that stays wet
For water you can't dump, like a rain barrel, ornamental pond or birdbath you want to keep full, the CDC suggests a larvicide. Bti dunks kill mosquito larvae and last about 30 days. Screen rain barrels so mosquitoes can't get in.
Check Under the Deck and Patio Furniture
Adult mosquitoes spend the day resting in shade and humidity. The CDC names spots like "under patio furniture or under the carport or garage." Professionals on LawnSite describe the underside of deck boards as a favorite: "Every time I do a mosquito service and blow under a deck, they all come pouring out from the bottom side of the deck boards." If your deck is low and the ground below stays damp, improve drainage, clear leaves and clutter from underneath, and trim dense shrubs next to the patio.
Screen It In
If you use a porch every evening, screening is the only option that physically keeps mosquitoes out. Check screens for tears, seal gaps around screen doors, and keep the door closed. A fan inside a screened porch handles the few that slip in.
What Makes You a Target
Mosquitoes find people mainly by carbon dioxide, body odor and heat, and some people really are more attractive than others because of differences in skin chemistry. A few things you can change:
- Clothing color. In a University of Washington lab study, mosquitoes that had smelled carbon dioxide were drawn to red, orange, cyan and dark objects, while green, blue and violet objects were no more attractive than the white control. Light, loose clothing that covers legs and arms helps.
- Time of day. Asian tiger mosquitoes bite during the day, so sitting out in the afternoon doesn't avoid them the way it might avoid dusk biters.
- Beer. One study found that drinking beer made volunteers more attractive to malaria mosquitoes. It's one study with a different species, but it's a fun reason to keep the repellent handy at a cookout.
When to Treat the Yard
If you've dumped the water and still can't sit outside, a barrier treatment on the shrubs, fences and shady spots where mosquitoes rest can help. An NC State study of neighboring homes found bifenthrin barrier sprays significantly reduced Asian tiger mosquitoes, and these treatments typically last about three to four weeks, so they're repeated through the season. Mosquitoes don't rest on short open lawn, so spraying the grass is wasted. For details, see how often to spray for mosquitoes, whether misting systems are worth it and natural yard options. Our mosquito control service covers South Carolina, North Carolina and Virginia, including breeding-site checks and treatment of resting areas.
Key Takeaways
- Fans work by scattering the scent mosquitoes follow. Aim one across the seating area, low enough to reach legs.
- Metofluthrin repellers work close up in still air. Don't run one with a fan.
- Skin repellent (DEET, picaridin, OLE) is the most reliable protection.
- Citronella candles are weak; plants, zappers, ultrasonic gadgets and incense don't help.
- Dump standing water weekly near the patio and check under the deck.
Frequently Asked Questions
Combine a fan blowing across the seating area, EPA-registered repellent such as DEET, picaridin or oil of lemon eucalyptus on exposed skin, and a metofluthrin repeller next to you on still evenings. Then empty anything around the patio that holds water once a week so new mosquitoes aren't breeding nearby.
Yes. In a Michigan State University field study, fan-made wind strongly reduced the number of mosquitoes reaching carbon dioxide-baited traps. The wind scatters the carbon dioxide and body odor mosquitoes use to find you. Aim the fan across the seating area and low enough to reach legs.
Metofluthrin devices like Thermacell have performed well in studies, cutting landings by about 90% for a person sitting right next to one. They work best close to you and in still air, so don't run one alongside a fan or expect it to protect the whole yard.
Only a little. In a field study, citronella candles cut bites by 42%, but plain unscented candles cut them by 24%. Diffusers and candles with higher oil concentrations do better. Use them as a backup to a fan and skin repellent.
In studies, geraniol and linalool repelled mosquitoes better than citronella, especially from diffusers. But scents fade quickly outdoors and blow away in a breeze. Repellents like DEET, picaridin and oil of lemon eucalyptus applied to skin are far more reliable.
A fan and a metofluthrin repeller near the seating area work best. Also check under the deck, where mosquitoes rest during the day, and remove standing water from saucers, covers and toys. Potted repellent plants didn't reduce mosquitoes in a 16-week field study.
There's no good evidence that coffee grounds, burned or spread around, repel adult mosquitoes. Lab studies found caffeine and coffee grounds in water can stop larvae from developing, but that doesn't keep biting mosquitoes off a patio.
Dragonflies, fish such as mosquitofish, and other predators eat mosquitoes, but none of them controls mosquitoes well enough to protect a patio. Bats and purple martins eat far fewer mosquitoes than often claimed. Removing standing water does more.
Usually because they're breeding close by. Asian tiger mosquitoes breed in small containers like plant saucers, buckets and clogged gutters, go from egg to adult in about a week, and don't travel far. They also rest in shady spots under decks and furniture.
Sources: E. J. Hoffmann & J. R. Miller, Journal of Medical Entomology 40(5) (2003); L. R. Lindsay et al., Journal of the American Mosquito Control Association 12 (1996); G. C. Müller et al., Journal of Vector Ecology 34 (2009); S. D. Rodriguez et al., Journal of Insect Science 17(1) (2017); A. D. Lopez et al., Frontiers in Insect Science (2026); Novelo et al., Journal of Medical Entomology 63(4) (2026); O. Zarella et al., PLoS ONE (2022); N. N. Rawlings et al., Parasites & Vectors (2026); M. J. Couvillon et al., Journal of Insect Science (2024); D. Alonso San Alberto et al., Nature Communications 13 (2022); M. VanderGiessen et al., iScience (2023); T. Lefèvre et al., PLoS ONE (2010); B. Hollingsworth et al., Journal of Medical Entomology 57 (2020); Enayati, Hemingway & Garner, Cochrane review (2007); Frick & Tallamy, Entomological News (1996); Nguyen, University of Georgia dissertation (2016); CDC, "Mosquito Control at Home"; CDC, "Preventing Mosquito Bites"; University of Florida IFAS Extension, "Mosquito Repellents" (IN419); Clemson Cooperative Extension HGIC 2471, "Asian Tiger Mosquito"; American Mosquito Control Association, FAQs; LawnSite forum; Reddit r/MosquitoHating, r/self, r/mildlyinfuriating (via Google search excerpts).
Photo credits: James Gathany, CDC, Public domain; Fir0002, CC BY-SA 3.0, via Wikimedia Commons.