Grandma Knows: How to Keep Spiders Out of the House

There is a certain kind of calm that comes from walking into a clean, tidy home and knowing that every corner has been looked after. But that calm can disappear quickly when a spider drops from the ceiling or scurries across the bathroom floor. For most people, spiders in the house are not a welcome sight — and while most household spiders are harmless, that does not make them any less startling to find behind the curtains or tucked into a shoe.

The good news is that keeping spiders out of the house does not require expensive chemicals or professional treatments. With a little understanding of why spiders come inside in the first place, and some consistent habits built around simple, natural remedies, you can make your home a place spiders simply prefer to avoid. These are practical, proven methods — the kind that have been used in households for generations — and they work best when you use them together as part of a regular routine.

Why Spiders Come Inside

Spiders are not trying to bother anyone. They are looking for three things: warmth, shelter, and food. When the weather turns cold or dry, the outdoors becomes less hospitable, and spiders begin looking for a way inside. Gaps around windows and doors, cracks in the foundation, spaces around pipes, and open vents are all common entry points. Once inside, a spider will look for a quiet, undisturbed corner where small insects — their food source — tend to gather.

This is an important point. If there are spiders in your home, it often means there are also smaller insects present, because spiders follow their food supply. Addressing both problems at the same time gives you the best results. A home that is sealed, clean, and free of the insects that spiders feed on is a home that spiders will naturally avoid.

Certain rooms tend to attract spiders more than others. Basements, garages, attics, and crawl spaces are prime locations because they are dark, quiet, and less frequently disturbed. Bathrooms attract spiders because of the moisture and the small insects that are drawn to damp spaces. Kitchens can also be a target, especially around cabinets and under sinks where crumbs and moisture collect.

Traditional Remedies That Actually Work

Long before pest control companies existed, households managed spider problems with what they had on hand. Many of those old-fashioned remedies hold up well, and the reason is simple: spiders have a strong sense of smell and are sensitive to certain scents and substances. Their legs absorb chemical information directly from surfaces they walk on, which makes them particularly vulnerable to repellents that humans can barely detect.

Peppermint Oil

Peppermint oil is one of the most widely recommended natural spider repellents, and it genuinely delivers results. Spiders find the strong scent of peppermint deeply unpleasant and will go out of their way to avoid areas where it is present. To use it, mix about fifteen to twenty drops of pure peppermint essential oil with water in a standard spray bottle. Shake well and spray along windowsills, door frames, baseboards, and any other entry points or spider-prone corners.

Reapply every one to two weeks, or after you clean those surfaces. The scent fades over time, and consistency is what makes this method effective. Cotton balls soaked in peppermint oil and tucked into corners of closets, under sinks, or behind furniture can extend the effect between spray applications.

One thing to keep in mind: peppermint oil is safe for most households, but it should be kept away from pets, especially cats, who can be sensitive to essential oils. Always dilute the oil properly — using it undiluted can damage surfaces and cause skin irritation.

White Vinegar Spray

White vinegar is a household workhorse, and its usefulness extends to spider prevention. The acetic acid in vinegar is irritating to spiders and disrupts the chemical trails they leave behind to navigate. Mix equal parts white vinegar and water in a spray bottle and apply it to the same areas you would treat with peppermint oil — entry points, windowsills, and corners where spiders tend to appear.

Vinegar is especially useful in areas where you want to avoid strong scents, such as near food storage. It also doubles as a general cleaner, so treating your kitchen surfaces with a vinegar solution serves two purposes at once. Be cautious using vinegar on natural stone surfaces like marble or granite, as the acidity can cause damage over time.

Citrus Peels and Lemon

Spiders have a strong aversion to citrus. Fresh lemon, orange, or lime peels placed along windowsills, in corners of rooms, or near doorways can help deter them. This is a simple and natural method that leaves behind a pleasant scent for people while being off-putting to spiders.

You can also rub citrus peels directly along the edges of window frames and door frames. The oils left behind from the peel act as a repellent. Replace the peels every few days as they dry out and lose their potency. For a longer-lasting option, citrus-scented essential oils like lemon or orange can be diluted with water and used as a spray in the same way as peppermint oil.

Diatomaceous Earth

Food-grade diatomaceous earth is a fine powder made from the fossilized remains of tiny aquatic organisms. To spiders and other crawling insects, it acts as a physical barrier — the microscopic sharp edges of the powder damage their exoskeletons, causing them to dehydrate. It is completely natural and non-toxic to humans and pets when used as directed.

Sprinkle a thin line of diatomaceous earth along the base of exterior walls, in the corners of basements, around the edges of garage floors, and in any other area where spiders tend to enter or gather. It works best in dry conditions — moisture reduces its effectiveness. Reapply after cleaning or after any exposure to water.

Step-by-Step Prevention Methods

Seal Entry Points

The most effective long-term solution is to reduce the number of ways spiders can get inside. Walk around the outside of your home and look for gaps around window frames, cracks in the foundation, spaces around utility pipes, and any place where two surfaces meet imperfectly. Use caulk to seal small cracks and gaps. Install door sweeps on exterior doors that have visible light coming through at the bottom. Check that window screens are intact and fit snugly.

This step takes a little time up front but pays off for years. A home that is well-sealed keeps out far more than just spiders — it also reduces drafts, keeps out other insects, and can even lower heating and cooling costs.

Reduce Clutter and Hiding Spots

Spiders are attracted to undisturbed spaces where they can build webs without being bothered. Clutter gives them exactly what they need. Stacks of boxes, piles of old newspapers, storage areas that are rarely touched — these are all ideal spider habitats. Reducing clutter, especially in basements, garages, and storage rooms, removes the hiding spots that spiders depend on.

Store items in sealed plastic bins rather than open cardboard boxes. Cardboard is not just easy for spiders to hide in — it also attracts the small insects they feed on. Clear, sealed containers make it harder for spiders to nest and easier for you to spot any that do try to take up residence.

Regular Cleaning of Corners and Hard-to-Reach Areas

A consistent cleaning routine is one of the simplest and most effective tools in spider prevention. Use a vacuum or a broom to clear out corners, behind furniture, along baseboards, and in ceiling corners where webs tend to form. When you remove a web, you remove the spider's home and its egg sacs, which is important for preventing populations from growing inside your home.

Pay special attention to less-visited areas: the space behind the washing machine, under the bed, inside closets, and the corners of the garage. A quick pass with the vacuum every week or two in these spots can make a significant difference over time.

Manage Outdoor Lighting

Outdoor lighting attracts moths, flies, and other insects — and those insects attract spiders. Switching outdoor lights to yellow-tinted bulbs or sodium vapor lights, which are less attractive to insects, reduces the number of insects gathering near your doors and windows. Fewer insects near the entry points of your home means fewer reasons for spiders to come looking.

If possible, position outdoor lights away from the house itself — on a post or fence rather than directly over the door — so that insects are drawn away from your entry points rather than directly to them.

Variations and Special Situations

For Basements and Garages

These spaces require a slightly more intensive approach because they are harder to seal completely and are naturally more hospitable to spiders. Use diatomaceous earth along the perimeter. Keep items stored in sealed containers. Use a dehumidifier if the space is damp, as moisture attracts both insects and spiders. Inspect regularly and remove webs as soon as you spot them.

For Bathrooms

Moisture is the main issue in bathrooms. Fix any leaking pipes or dripping faucets, as standing water attracts the small insects that spiders feed on. Use a ventilation fan during and after showers to reduce humidity. Wipe down damp surfaces regularly. A small cotton ball with tea tree or peppermint oil placed under the sink cabinet can help keep spiders from settling in that enclosed, damp space.

For Gardens and Patios Near the House

Dense vegetation right against the exterior walls of your home gives spiders a bridge directly inside. Keep shrubs, plants, and ground cover trimmed back from the foundation. Move firewood stacks away from the house — firewood is a classic spider habitat, and having it stacked against the wall creates a direct path inside. Clear leaf piles and debris from areas close to entry points.

When These Methods Work Best — and When They Don't

Natural repellents and preventive habits work very well for keeping the ordinary, nuisance spiders that most households encounter from becoming a recurring problem. When used consistently and in combination — sealing entry points, reducing clutter, cleaning regularly, and applying natural repellents — most people see a noticeable reduction in spider activity within a few weeks.

These methods are less effective when used only occasionally or in isolation. A single application of peppermint spray, without any attention to entry points or clutter, is unlikely to produce lasting results. The key is consistency and layering multiple approaches together.

It is also worth knowing when to call for professional help. If you live in an area where venomous spiders such as the black widow or brown recluse are common, and you are finding them regularly inside your home, that situation warrants a different response. These species require proper identification and targeted treatment, and the peace of mind that comes from professional assessment is worth it. For the vast majority of households, however, the calm, practical methods outlined here are more than enough to keep spiders where they belong — outside.