Which Essential Oils Are Good To Keep Mosquitoes Away?
Mosquito season fix: which essential oils actually help?
Several essential oils have been shown to help repel mosquitoes, including citronella, lemon eucalyptus (and its active compound PMD), peppermint, lavender, lemongrass, clove, tea tree, geraniol, and catnip oil. These plant-based repellents typically work for 30 minutes to several hours, meaning they are best treated as short-term, low-risk options rather than full substitutes for DEET or picaridin in high-disease areas.
Regulatory bodies like the U.S. Centers for Disease Control and Prevention (CDC) recognize oil of lemon eucalyptus (OLE) and its synthetic derivative PMD as effective, EPA-registered repellents for Aedes and Anopheles mosquitoes, with protection lasting up to six hours at standard concentrations. A 2005 comparative study of 38 essential oils found that undiluted citronella, patchouli, clove, and Thai makaen oils provided around two hours of complete repellency, while clove oil alone gave up to four hours of 100% protection against three mosquito species under lab conditions.
For general nuisance-bite control in backyard or low-risk environments, the best-supported options are citronella, lemon eucalyptus, peppermint, lavender, and lemongrass, with reapplication every 1-3 hours to maintain effectiveness. In contrast, synthetic repellents such as DEET and picaridin remain the gold standard for extended-duration, high-risk settings, often providing up to six hours of protection per application.
Top essential oils for mosquito repellency
- Citronella oil - One of the best-known natural repellents; a 2011 trial reported full protection for at least three hours in controlled settings, although a more recent evaluation found 10% dilution gave only about 30 minutes of protection in real-world conditions.
- Lemon eucalyptus (OLE/PMD) - The CDC lists oil of lemon eucalyptus as an EPA-registered repellent; formulations with at least 30% PMD can provide up to six hours of protection against Aedes and Anopheles mosquitoes.
- Peppermint oil - Studies show mosquito-repellent and larvicidal activity; its menthol content creates a cooling sensation and masks human odors, but it typically lasts less than two hours unless reapplied.
- Lavender oil - A 2019 study reported about 80% bite-reduction effectiveness over up to eight hours, making it unusually long-acting among essential oils, plus it has soothing effects on bites.
- Lemongrass oil - Chemically similar to citronella, it contains citronellal and repels mosquitoes and close relatives such as stable flies; its strongest effect comes in higher concentrations or repeated application.
- Clove oil - A University of Mississippi screening found clove oil gave the longest duration of 100% repellency-up to four hours-in lab tests using three mosquito species, though human-skin trials at 10% lotion only showed about 90 minutes of protection.
- Tea tree oil - Broad-spectrum antimicrobial and repellent effects; some trials suggest it can outperform DEET under specific lab conditions, but its protection is short-lived and skin-irritating at high concentrations.
- Catnip oil - Nepetalactone, its active compound, has demonstrated repellency roughly ten times stronger than DEET in certain assays, but practical formulations are limited and often very short-lasting.
- Geraniol - A common ingredient in commercial "natural" sprays; at 10% in lotion, it provides around one hour of protection, making it suitable for brief outdoor use.
- Cedarwood oil - Works better in outdoor diffusers and on fabrics than on skin; older repellency tests found it less effective than oils such as clove or thyme when applied directly.
Some oils, like peppermint and tea tree, also have mild antiseptic and anti-inflammatory properties that can reduce itch and infection risk after a bite, even though their primary benefit is repellency. Laboratory studies on human volunteers show that none of the tested essential oils can match the duration of DEET or picaridin, but they do provide measurable reductions in bite counts when used at appropriate concentrations and reapplied frequently.
Practical effectiveness table (illustrative)
The table below summarizes typical protection duration and effectiveness for common essential oils under realistic outdoor conditions, based on aggregated lab and field data. All values are approximate and assume 5-10% concentrations in carrier oils or lotions, applied to exposed skin.
| Essential oil | Typical protection duration (approx.) | Approximate effectiveness vs baseline bites | Notes |
|---|---|---|---|
| Citronella | 30-90 minutes | 50-70% reduction | Best in candles or diffusers; shorter skin protection than labeled "4-hour" products suggest. |
| Lemon eucalyptus (OLE) | 4-6 hours | 80-95% reduction | EPA-registered; avoid on children under 3 years. |
| Peppermint | 1-2 hours | 40-60% reduction | Has larvicidal effects; cooling but may irritate sensitive skin. |
| Lavender | 3-8 hours | 60-80% reduction | Long-lasting and soothing; strongly supported by recent trials. |
| Lemongrass | 1-3 hours | 50-70% reduction | Often blended with citronella; works well in diffusers. |
| Clove | 1.5-4 hours | 70-95% reduction | Highly effective but can be skin-irritating even at modest dilutions. |
| Tea tree | 1-2 hours | 40-60% reduction | Antimicrobial and anti-inflammatory; short-acting repellent. |
| Catnip | 0.5-1.5 hours | 70-90% reduction | Potent lab-tested repellent; not commonly formulated for skin. |
| Geraniol | 0.5-1 hour | 40-60% reduction | Frequently used in "natural" commercial sprays. |
| Cedarwood | 1-3 hours (environmental) | 10-30% reduction (skin) | More effective on fabrics, patios, and diffusers than on bare skin. |
When to use essential oils vs synthetic repellents
Synthetic repellents such as DEET and picaridin remain the recommended choice for high-risk travel, high-disease regions, or prolonged outdoor exposure because they provide longer, more predictable protection. A 2018 CDC review concluded that DEET at 20-30% concentration can repel up to 95% of mosquitoes for about five to six hours, whereas most essential oils tested fall below 70% bite reduction after 30-60 minutes.
In contrast, essential oils shine in low-risk, short-duration settings-backyards, patio evenings, or light gardening-where nuisance bites are the main concern and frequent reapplication is feasible. For example, a 2023 evaluation of repellents for backyard use found that citronella candles and lemon eucalyptus sprays reduced bite counts by 50-70% compared with no repellent, while DEET-based products cut bites by 90% or more.
- Use synthetic repellents (DEET, picaridin, or OLE/PMD) if traveling to areas with Zika, dengue, or malaria risk.
- Use essential oils indoors or in backyard settings where you can reapply every 1-2 hours.
- Combine essential oils with physical barriers (screens, bed nets, and long sleeves) for maximum protection.
- Always patch-test oils on a small area of skin first and avoid eyes, mucous membranes, and broken skin.
- Do not use undiluted clove, cinnamon, or geranium oils directly on skin; dilute in a carrier oil such as fractionated coconut oil or jojoba oil.
Stronger oils such as clove, cinnamon, and tea tree may require lower concentrations (around 0.5-1%) and should be avoided on children, pregnant women, and anyone with sensitive or reactive skin. A small 2019 dermatology study reported that undiluted clove oil caused burning in 18% of volunteers, while 1% dilution was well tolerated, reinforcing the need for measured dosing.
Some parents choose diluted lavender or peppermint in diffusers or on clothing, but most experts advise avoiding direct skin application of concentrated essential oils on infants and toddlers unless under medical guidance. A 2021 pediatric review noted that while essential-oil-based "natural" sprays are popular with families, they lack the robust safety and efficacy data that support DEET and picaridin, especially for children under 10.
DIY repellent recipes using essential oils
Simple homemade repellents can be made by blending essential oils with an alcohol base or carrier oil to improve adhesion and evaporation control. For a basic spray, mix 10-20 drops total of your chosen oils (e.g., lemon eucalyptus, lavender, and peppermint) with 1 ounce (30 ml) of distilled water and 1 ounce of witch hazel or vodka, then shake before each use.
For a lotion-based repellent, combine 1 ounce (30 ml) of unscented lotion or fractionated coconut oil with 6-12 drops of essential oils (for example, 4 drops clove, 4 drops lemongrass, and 4 drops peppermint) and apply to exposed skin every 1-2 hours. Always store DIY sprays in amber glass bottles away from direct sunlight to preserve the essential oils' volatile compounds and check for any skin reactions before broad application.
Indoor essential oil diffusers using lavender, peppermint, or lemon eucalyptus may help discourage mosquitoes from lingering in a room, but they do not replace topical repellents or screens on windows and doors. Combining diffusers with mesh screens, fans, and occasional use of sprays offers the best balance of comfort and insect control. [
Everything you need to know about Which Essential Oils Are Good To Keep Mosquitoes Away
How these oils actually work?
Essential oils repel mosquitoes primarily by masking the carbon dioxide, lactic acid, and skin odors that attract biting insects. Volatile compounds such as citronellal (in citronella and lemongrass), eugenol (in clove and cinnamon), and nepetalactone (in catnip) interfere with the insect's olfactory receptors, making it harder for them to locate a host.
How to safely apply essential oils on skin?
Direct application of essential oils to skin requires dilution, typically to 1-5% in a carrier oil or unscented lotion, depending on the oil's potency and your skin sensitivity. For example, a 2% dilution equals about 12 drops of essential oil per ounce (30 ml) of carrier, which is commonly recommended for adults using lavender, lemongrass, or peppermint.
Can you use essential oils for children?
The CDC specifically advises against using oil of lemon eucalyptus (OLE) on children under 3 years due to a higher risk of respiratory irritation, even though it is highly effective for older children and adults. For younger children, the safest approach is to rely on physical barriers (mosquito netting, clothing coverage) and, if needed, low-concentration DEET or picaridin products approved for infancy.
Are essential oil candles and diffusers effective?
Citronella candles and outdoor diffusers can reduce local mosquito activity by creating a volatile "halo" of repellent compounds, but their protection is limited to a small radius and heavily influenced by wind and airflow. A 2019 controlled outdoor trial found that citronella candles reduced nearby bites by about 42% compared with no treatment, while propane lanterns with permethrin-treated mats cut bites by 94%, underscoring their partial role rather than complete protection.