Peppermint oil does repel spiders, but it works better against some species than others, and how you mix and apply it matters more than which brand you buy. The best peppermint spider spray is one with the right concentration of oil, an emulsifier to keep it mixed, and a reapplication schedule that accounts for how quickly the scent fades. For most people, a simple DIY version works just as well as commercial options.
Does Peppermint Oil Actually Work?
Lab research confirms that peppermint oil genuinely repels certain spider species. In a controlled study published in the Journal of Economic Entomology, brown widow spiders strongly avoided peppermint oil: 12 out of 15 tested spiders moved away from it, and nearly half of the spiders in mint oil trials “huddled” (froze in place) when they first detected the scent. Even among spiders that didn’t freeze, 68% still chose the side without peppermint. Garden orb-weaver spiders showed similar avoidance.
The catch is that not every species responds the same way. In that same study, false widow spiders showed no preference between peppermint and a control, walking toward it just as often as away from it. A separate study found peppermint oil strongly repelled two out of three tested species, while the third was largely unbothered. So peppermint spray is a useful deterrent, not a guaranteed barrier. If you’re dealing with a serious infestation or a medically significant species like brown recluses or black widows, peppermint alone is not a reliable solution.
How to Make Your Own Spray
A DIY peppermint spider spray is cheap and takes about two minutes to put together. The standard recipe: add roughly five drops of peppermint essential oil to a 16-ounce spray bottle filled with water, then add a small squirt of dish soap. The soap acts as an emulsifier, helping the oil mix into the water instead of floating on top. Shake well before each use.
If you want a stronger spray, you can increase to 10 or 15 drops per 16 ounces. More oil means a stronger scent and potentially better repellent effect, but it also means a stronger smell in your living space and a greater concern if you have pets. Start with five drops and increase if you’re not noticing results after a week or two.
Use 100% pure peppermint essential oil rather than peppermint extract or fragrance oil. Fragrance oils are synthetic and don’t contain the same volatile compounds that spiders respond to. Any reputable essential oil brand will work. There’s no meaningful difference between a $6 bottle and a $20 one for this purpose.
Where and How Often to Spray
Focus on entry points and the spots where spiders like to settle. That means windowsills, door frames, corners where walls meet ceilings, gaps around pipes, and the edges of your garage or basement. Spiders follow prey insects, so anywhere you notice small bugs congregating is a good target.
Peppermint oil is volatile, meaning its scent fades relatively quickly compared to synthetic pesticides. You’ll need to reapply at least once a week, and more often in well-ventilated areas, outdoor-facing spots, or during humid weather. If you can’t smell the peppermint anymore, neither can the spiders. Some people keep a bottle by the front door and give problem spots a quick spray every few days as part of their routine.
Avoid spraying directly on fabrics or finished wood, as the oil can leave stains. Test a small hidden area first if you’re concerned about a particular surface.
DIY vs. Commercial Sprays
Commercial peppermint spider sprays typically combine peppermint oil with other essential oils like rosemary, lemon, or cedarwood, and sometimes include additional surfactants for a more even spray. They’re convenient and often come in ready-to-use bottles with better spray nozzles than a repurposed cleaning bottle. Brands like Mighty Mint and Stay Away are popular options in this category.
The practical difference between a well-made DIY spray and a commercial one is small. Commercial products may last slightly longer per application because of their formulation, but you’re still reapplying regularly either way. Where commercial sprays have a real advantage is consistency. You get the same concentration every time without measuring drops. If you prefer convenience over cost savings, a commercial spray is fine. If you’d rather spend $8 on a bottle of peppermint oil that lasts months, the DIY route delivers comparable results.
Safety Around Pets
Peppermint oil poses real risks to pets, especially cats. Cats lack a specific liver enzyme needed to process certain compounds found in essential oils, making them especially vulnerable to toxicity. Their grooming habits compound the problem: if oil mist settles on fur, they’ll ingest it. Signs of essential oil toxicity in pets include vomiting, difficulty breathing, seizures, and in severe cases, liver or kidney failure.
Dogs are less sensitive than cats but still at risk. Birds are particularly vulnerable because their respiratory systems are uniquely sensitive to aerosolized particles.
If you have pets, follow these guidelines:
- Never spray directly on or near pet bedding, food bowls, or litter boxes.
- Keep pets out of the room while spraying and ventilate the area before letting them back in.
- Stick to diluted sprays rather than applying undiluted oil to surfaces.
- Avoid diffusers in shared spaces. Ultrasonic and nebulizing diffusers release oil microdroplets that settle on fur and feathers.
Pets with preexisting respiratory conditions like feline asthma or chronic bronchitis are at even higher risk. In homes with cats or birds, you may want to limit peppermint spray to enclosed areas your pets can’t access, like a sealed garage or crawl space.
Getting Better Results
Peppermint spray works best as one layer of a broader approach rather than a standalone fix. Spiders enter homes looking for prey, so reducing the insect population inside your house makes it less attractive to them in the first place. Sealing cracks around windows and doors, keeping outdoor lights off at night (lights attract the insects spiders eat), and reducing clutter in basements and garages all make a bigger long-term difference than any spray.
Peppermint spray is most effective as a perimeter deterrent, discouraging spiders from crossing treated thresholds. It won’t kill spiders that are already established inside, and it won’t repel every species equally. For the common house spiders most people encounter, though, a consistently applied peppermint spray is a reasonable, low-toxicity way to keep numbers down without reaching for chemical pesticides.