Does Peppermint Essential Oil Repel Spiders? | What The Science Says

For the full breakdown, see our best Peppermint Essential Oil For Spiders guide.

The idea of using peppermint essential oil for spiders has spread through every natural-cleaning blog on the internet. There’s a reason it persists: the scent is strong, the premise feels logical, and a few spider species genuinely do avoid it in controlled experiments. But whether peppermint oil will actually keep spiders out of your home depends heavily on which spider you’re dealing with—and the scientific evidence is far more limited than most articles suggest.

If you’re looking for a natural deterrent rather than a guaranteed repellent, peppermint oil can have a place in your approach. For a reliable fix, you need to know what the research actually shows, which spiders respond, and where the method falls short.

What The Research Shows About Mint Oil And Spiders

The strongest evidence for peppermint oil as a spider deterrent comes from a 2018 study published in the Journal of Economic Entomology. Researchers tested several essential oils against three spider species and found that mint oil strongly repelled two of them: Latrodectus geometricus (the brown widow spider) and Araneus diadematus (the European garden spider). A third species, Steatoda grossa (the false widow spider), showed noticeably less sensitivity to the oil.

That same study delivered an important side finding: lemon oil had no effect on any of the spiders tested. This matters because peppermint is often lumped together with other “natural repellent” claims that don’t share the same evidence. Just because one essential oil works on one species doesn’t mean the whole category is effective.

A follow-up study in 2022 tested mint oil against Cheiracanthium mildei, the common house spider, and found no significant repellent or lethal effect. In other words, the spider you’re most likely to see indoors may be the one peppermint oil affects least.

Why Peppermint Oil Isn’t A Guaranteed Spider Repellent

Several factors explain why peppermint oil is best treated as a limited deterrent rather than a reliable solution:

• Species sensitivity varies. A result observed in one spider species cannot be assumed for all spiders. Brown widows may avoid mint oil; common house spiders appear unaffected.
• Lab conditions differ from real homes. The evidence comes from controlled choice tests, not long-term field studies of household protection.
• Commercial pest-control companies dispute essential-oil claims. There is little scientific research proving peppermint oil repels or kills spiders, and many professionals reject the idea outright.
• No standard application exists. No official source endorses a specific concentration or method, which leaves room for inconsistent results.

If you’re determined to try peppermint oil anyway, the practical approach is to dilute it with water and a small amount of dish soap, spray it along baseboards, window sills, and door frames, and reapply after cleaning.

What Works Better Than Peppermint Oil For Spider Control

Given the inconsistent evidence, the most effective spider control starts with prevention rather than scent. Sealing cracks and gaps around windows and doors, removing webs regularly, keeping outdoor lights off at night, and reducing clutter where spiders hide will do more than any essential oil.

For indoor infestations, sticky traps placed along walls and in corners give you a clear picture of where spiders are active. Vacuuming visible spiders and webs immediately removes the problem without relying on scent-based deterrence.

The table below summarizes what the research actually supports:

Is Peppermint Oil Safe To Use Indoors?

No source in the research supports using undiluted essential oil as a general indoor pest-control treatment. Essential oils are potent compounds, and peppermint oil can irritate skin and eyes in concentrated form. It is also toxic to cats and dogs, so households with pets should use extreme caution or skip the approach entirely.

The honest bottom line is that peppermint oil may deter a few spider species in specific conditions, but it is not a proven, reliable home pest-control solution. Treat it as a mild deterrent with limited results, and pair it with real prevention measures for the best outcome.