Several essential oils repel mosquitoes, but only a few work well enough to matter. Oil of lemon eucalyptus is the standout performer, the only plant-derived essential oil ingredient that the CDC and EPA recommend for preventing bites that could transmit disease. Other oils like citronella, cinnamon, clove, and geraniol do repel mosquitoes, but they wear off quickly and offer far less protection than conventional repellents.
Oil of Lemon Eucalyptus: The Most Effective Option
Oil of lemon eucalyptus (OLE) is the gold standard among plant-based mosquito repellents. Its active compound, p-menthane-3,8-diol (PMD), is one of only six active ingredients the CDC lists as proven effective against disease-carrying mosquitoes, alongside synthetic options like DEET and picaridin. A product like Repel Lemon Eucalyptus provides roughly two hours of complete protection per application.
One important distinction: OLE is not the same thing as pure lemon eucalyptus essential oil you’d find in an aromatherapy shop. OLE goes through a refining process that concentrates the PMD, which is the compound that actually keeps mosquitoes away. Buying a bottle labeled “lemon eucalyptus essential oil” and rubbing it on your skin will not give you the same protection. Look specifically for EPA-registered products listing OLE or PMD as the active ingredient.
PMD is also available as a synthetic version, which performs identically. Both are safe for pregnant women and children over three years old when used as directed. Neither should be used on children under three.
Citronella: Popular but Short-Lived
Citronella is probably the most widely recognized mosquito-repelling essential oil, used in candles, sprays, and wristbands. It does repel mosquitoes, but not for long. A systematic review of controlled lab studies found that citronella products provided roughly four hours less protection than DEET-based products against Aedes mosquitoes (the species that carries dengue and Zika). In practical terms, citronella applied to the skin may keep mosquitoes away for 30 minutes to an hour before you need to reapply.
Citronella candles and diffusers are even less reliable. They create a cloud of scent that can reduce bites in a small area, but wind, open spaces, and heavy mosquito pressure easily overwhelm them. If you’re sitting on a patio, a citronella candle might help slightly. If you’re hiking through a marsh at dusk, it won’t do much.
Cinnamon, Clove, and Geraniol
Among the lesser-known essential oils, cinnamon oil consistently performs well in lab testing. A 2023 study testing 20 essential oils against Aedes aegypti mosquitoes found that cinnamon oil was the only one that showed repellent activity across all three types of assays used. At a 10% concentration in a lotion, cinnamon oil and clove oil both provided protection lasting over 100 minutes against mosquitoes. Geraniol, a compound found in rose, citronella, and lemongrass oils, also ranked among the top performers.
Cinnamon oil has an additional property: it kills mosquito larvae in standing water at relatively low concentrations and can discourage egg-laying. That makes it potentially useful for treating birdbaths or rain barrels, though it’s not a substitute for dumping standing water entirely.
Catnip Oil
Catnip oil contains a compound called nepetalactone that mosquitoes dislike. Research comparing catnip oil directly to DEET found that catnip was actually the better spatial repellent, meaning it was more effective at keeping mosquitoes from approaching an area. However, DEET was more effective as a contact repellent, the type that works when applied to skin. So catnip oil might have some value in a diffuser or spray for a room, but it’s less practical as something you’d put on your body before going outside.
Why Essential Oils Wear Off So Fast
The core problem with most essential oils as mosquito repellents is volatility. The same property that makes them aromatic, the rapid evaporation of their active compounds, is what makes them poor at sustained protection. DEET and picaridin are formulated to sit on the skin and release slowly over hours. Essential oil compounds evaporate into the air quickly, which means whatever repellent effect they have fades in under two hours for even the best performers, and often much less.
Essential oils work against mosquitoes through several mechanisms. Some compounds interfere with the proteins mosquitoes use to detect human scent, essentially jamming their ability to find you. Others affect insect nervous system receptors that have no equivalent in mammals, which is why they’re generally safe for humans at appropriate concentrations. But because these compounds are lightweight and volatile, they simply don’t last on the skin the way synthetic repellents do.
How to Use Essential Oils Safely
Essential oils should never be applied undiluted to skin. Many cause irritation or burns at full concentration, and citrus-derived oils can cause severe reactions when exposed to sunlight. A common dilution for mosquito repellent is a 1:10 ratio, one part essential oil to ten parts carrier liquid like witch hazel or a carrier oil such as coconut or jojoba oil. For a 10% lotion formulation, which is the concentration used in most lab studies showing effectiveness, that ratio is about right.
Reapplication is necessary far more often than with conventional repellents. Plan to reapply every 30 to 60 minutes for most essential oils, or every two hours for OLE-based products. If you’re sweating or swimming, reapply sooner.
If you have pets, be cautious. The ASPCA warns that concentrated essential oils are dangerous to dogs and cats, with as few as seven or eight drops of tea tree oil potentially causing health problems. Avoid applying essential oils directly to pets, and if you have birds, skip diffusers entirely. Birds have extremely sensitive respiratory systems and can develop serious issues from airborne essential oil particles.
What the CDC Actually Recommends
The CDC’s list of recommended active ingredients for mosquito repellents includes only two plant-derived options: oil of lemon eucalyptus (OLE) and 2-undecanone, a compound originally identified in wild tomato plants. Every other essential oil, including citronella, cinnamon, clove, lavender, and peppermint, falls into the category the CDC describes plainly: “We do not know the effectiveness of non-EPA registered insect repellents, including some natural repellents.”
That doesn’t mean these oils do nothing. Lab studies confirm they have real repellent properties. But the protection they offer is shorter, less consistent, and less studied than EPA-registered options. If you’re in an area where mosquitoes carry serious diseases like West Nile, Zika, or malaria, OLE or PMD is the minimum plant-based option worth relying on. For a backyard barbecue in a low-risk area, a homemade spray with cinnamon or clove oil in a carrier lotion can reduce bites, as long as you reapply frequently and keep your expectations realistic.