Moths inside your house almost always come from one of two sources: food you brought home from the store, or animal-fiber textiles like wool, silk, and fur. The moths you’re seeing aren’t flying in from outside. They hatched and grew up somewhere inside your home, feeding on something you probably haven’t noticed yet. Identifying which type of moth you have tells you exactly where to look.
Pantry Moths vs. Clothes Moths
There are two categories of moths that infest homes, and they behave very differently. Pantry moths (most commonly the Indianmeal moth) are about half an inch long at rest, and you’ll often see them flying around your kitchen or other rooms, especially at night. They’re drawn to light and are relatively easy to spot.
Clothes moths are smaller, only about a quarter inch long, and they actively avoid light. You’re unlikely to see them flying around. They stick to dark, undisturbed spaces like closets, basements, attics, and the undersides of furniture. If you’re seeing moths fluttering around your house regularly, they’re almost certainly pantry moths. If you’re finding mysterious holes in sweaters or threadbare patches on wool rugs, clothes moths are the likely culprit even if you’ve never seen one.
How Pantry Moths Get Inside
Pantry moths enter your home as eggs or larvae hidden in food packaging. They arrive in cereal, flour, grains, rice, beans, nuts, dried fruit, spices, chocolate, candy, birdseed, and dry pet food. The infestation starts at the warehouse, processing facility, or grocery store, and you carry it home without knowing. By the time you see an adult moth flying through your kitchen, larvae have already been feeding somewhere in your pantry for weeks.
A single female lays hundreds of eggs directly on or near food sources. The larvae are tiny caterpillars that can chew through plastic bags and thin cardboard, so even unopened packages can become infested. This is why you might find webbing or small worms inside a sealed box of pasta you bought a month ago. The eggs were already there when you purchased it, or larvae chewed their way in from an adjacent infested item.
How Clothes Moths Get Inside
Clothes moths typically arrive on secondhand clothing, vintage furniture, antique rugs, or inherited textiles. Thrift store wool sweaters, estate sale tapestries, and used upholstered furniture are common carriers. The eggs and larvae are nearly invisible, tucked into folds, seams, and hidden surfaces of fabric. You can also bring them in on new items that were stored in infested warehouses.
Once inside, clothes moths seek out dark, undisturbed spots. They feed on animal-derived fibers: wool, silk, cashmere, fur, feathers, and leather. They’ll also eat lint, pet hair, and dust that contains skin cells or hair. A forgotten wool blanket in the back of a closet or a carpet beneath heavy furniture provides the perfect combination of food and darkness. Clothes moths prefer dark, undisturbed areas such as closets, basements, and attics, which is why infestations can grow for months before you notice.
Why the Problem Grows Quickly
Female clothes moths lay between 30 and 200 eggs at a time, gluing them to surfaces with a sticky secretion. The eggs hatch in four to ten days into near-microscopic white caterpillars. These larvae are the ones doing all the damage, not the adult moths. The larval stage can last anywhere from one month to two years depending on temperature, humidity, and food availability. In a warm house with plenty of wool or stored food, the cycle speeds up considerably.
Pantry moth reproduction follows a similar pattern. Hundreds of eggs laid directly on food means a single contaminated bag of flour can produce a large population within weeks. The larvae feed, pupate, emerge as adults, mate, and lay more eggs, creating overlapping generations that make the problem feel like it appeared out of nowhere.
Signs You Have an Infestation
For pantry moths, the first sign is usually spotting an adult moth flying near your kitchen ceiling or walls. Check your pantry for fine silken webbing on food surfaces, small caterpillars crawling on shelves, or clumps in dry goods like flour and cereal. You may also see tiny fecal pellets that look like grains of sand.
Clothes moth damage is harder to spot because it happens in hidden locations. Look beneath collars and cuffs of stored clothing, in crevices of upholstered furniture, and in carpeted areas beneath heavy furniture. The signs include:
- Silken tubes or mats on fabric surfaces, often with fibers and tiny fecal pellets woven in
- Surface grazing where fibers have been eaten at the base, creating threadbare patches
- Small irregular holes in wool, silk, or cashmere garments
- Cigar-shaped silken cases about 3/8 inch long, attached to fabric (these belong to casemaking clothes moth larvae)
- Loose fur or detached hair on animal pelts, hides, or taxidermy mounts
Finding the Source
If you’re seeing pantry moths, pull everything out of your pantry and inspect each item. Open boxes, bags, and containers. Look for webbing, larvae, or anything that seems clumped together unnaturally. Don’t skip items you wouldn’t expect, like spice packets, bags of dried beans, or pet food stored nearby. Larvae can chew into adjacent packages, so the infestation may have spread beyond the original contaminated item.
For clothes moths, check every item made of wool, silk, cashmere, or fur in your closets and storage areas. Pay special attention to items you haven’t worn or moved in months. Inspect the back corners of closet shelves, the undersides of area rugs, and any upholstered furniture with natural fiber fabric. Look along baseboards where lint and pet hair accumulate, since clothes moth larvae can survive on these organic debris deposits alone.
Getting Rid of Them
For pantry moths, throw away every infested item and anything you’re unsure about. Vacuum and wipe down all pantry shelves, paying attention to cracks and corners where eggs can hide. Transfer remaining dry goods into hard-sided, airtight containers that larvae can’t chew through. Glass jars with sealed lids or thick plastic containers with locking tops work well.
For clothes moths, start by laundering or treating every item in the affected area. Washing in hot water kills all life stages. If an item can’t be washed, freezing works: seal it in an airtight plastic bag and place it in a freezer set below 18°F (-8°C) for at least 72 hours. Any temperature above 122°F will also kill moths and eggs, so a hot dryer cycle is effective for items that can handle heat. Vacuum closets, shelves, baseboards, and carpet edges thoroughly, then dispose of the vacuum bag or empty the canister outside.
Pheromone traps are useful for monitoring and reducing moth populations. These sticky traps release a scent that mimics a female moth, attracting and trapping males to break the breeding cycle. Place two or three traps in affected closets at different heights and on opposite sides. They work both for active infestations and as an early warning system to catch new moths before the population builds again.
Keeping Moths From Coming Back
Prevention depends on which moth you’re dealing with. For pantry moths, store all dry goods in sealed, hard-sided containers as soon as you bring them home. This contains any eggs that might already be present and prevents larvae from spreading to other items. Rotate your stock so nothing sits untouched for months.
For clothes moths, the key is eliminating the dark, undisturbed conditions they need. Clean wool and silk garments before storing them, since moths are especially attracted to fabrics with sweat, food residue, or body oils. Store seasonal woolens in airtight garment bags or sealed bins. Vacuum closets and carpeted areas regularly, including under furniture. Cedar blocks and lavender sachets may offer mild deterrent effects, but they won’t stop an established infestation. Regular cleaning and proper storage are far more reliable than any repellent.