Clothes moths get into your home by hitching rides on secondhand clothing, vintage rugs, wool blankets, and other animal-fiber items you bring inside. They can also fly in through open windows and doors, though they’re weak fliers that prefer dark, undisturbed spaces. Once inside, they seek out quiet spots like closets, storage bins, and dresser drawers where they can lay eggs on materials their larvae will eat.
What Brings Clothes Moths Indoors
The single most common way clothes moths arrive is on infested items. A wool sweater from a thrift store, an antique rug from an estate sale, or a bag of hand-me-down blankets can carry moth eggs or larvae that are nearly invisible to the naked eye. Because eggs are tiny and larvae blend into fabric fibers, you won’t spot them during a casual inspection. By the time you notice damage, the moths may have been in your home for weeks or months.
Adult moths can also enter through open windows, but this is less common than people assume. Clothes moths are small (about the size of a grain of rice), pale gold, and they avoid light. Unlike the larger moths that circle your porch light at night, clothes moths actively seek darkness. That’s why infestations tend to start in places you don’t look often: the back of a closet, a box of winter clothes in the attic, or a rolled-up wool rug in the basement.
What They’re Actually After
Clothes moths don’t eat your clothes. Their larvae do. Adult moths live only 15 to 30 days and don’t feed at all. Their sole purpose is to mate and lay eggs on materials that will nourish the next generation. So when you see a small moth fluttering in your closet, the damage has likely already started.
Larvae feed exclusively on animal fibers: wool, silk, fur, feathers, felt, and leather. These materials contain keratin, a protein the larvae can digest. Cotton and synthetic fabrics like polyester are rarely attacked unless they’re blended with wool or heavily soiled with food stains, body oils, or perspiration. That last detail matters. Dirty clothes attract moths far more than clean ones, because sweat and skin oils provide extra nutrients the larvae need. A clean wool sweater stored properly is at much lower risk than a lightly worn one tossed in the back of a closet.
Pet hair and human hair that accumulates in corners, under furniture, and inside vacuum bags also provides a food source. Lint buildup along baseboards or in heating vents can quietly sustain a small population of larvae without you ever noticing.
How an Infestation Develops
The clothes moth life cycle runs one to three months under typical conditions, though larvae can survive for over a year in cooler environments with limited food. Eggs hatch in 4 to 21 days, producing tiny white larvae that immediately begin feeding. Webbing clothes moth larvae (the more common species) feed for anywhere from 35 days to two and a half years, depending on temperature and food supply. The casemaking species feeds for roughly 68 to 87 days. After the larval stage, pupation takes 8 to 40 days, with winter slowing things down considerably.
This means a single introduction of eggs on a thrift-store coat can quietly grow into a full infestation over the course of a season. The larvae stay hidden in folds of fabric, along seams, and inside dark storage spaces. You’ll typically notice irregular holes in garments, fine silk-like webbing on fabrics, or tiny sand-colored droppings before you ever see an adult moth.
How to Kill Moths Already in Your Home
Heat and cold are the most reliable ways to eliminate every life stage. Laundering infested items in water at least 120°F for 20 to 30 minutes kills eggs, larvae, and adults. For items that can’t be washed, you can place them in a dryer on high heat, or seal them in a plastic bag and freeze them for several days at temperatures below 18°F. Heating items in an oven at 120°F or above for at least 30 minutes also works, though this is only practical for smaller, heat-safe items.
Beyond treating individual garments, vacuum every drawer, closet shelf, baseboard, and piece of upholstered furniture where lint or hair could accumulate. Dispose of the vacuum bag immediately afterward, since it can contain live eggs and larvae. Cracks and crevices where larvae might hide can be treated with boric acid dust once infested items have been removed and cleaned.
Preventing Reinfestation
The most effective long-term protection is simple: keep animal-fiber garments clean and store them in airtight containers. Perspiration odors attract egg-laying females, so always launder or dry-clean wool, silk, and cashmere before putting them into seasonal storage. Shake or brush clothes before returning them to a closet or drawer, which dislodges any eggs or larvae that may have been deposited.
For garments that aren’t stored in sealed containers, placing them in a dryer or setting them in direct sunlight once or twice a month destroys larvae before they can cause visible damage. Regularly vacuuming closets, drawers, and areas where pet hair collects removes the breeding material that sustains small populations between seasons.
Pheromone traps can help you monitor for moths but won’t eliminate an infestation on their own. These traps use synthetic female sex pheromones to attract male moths, pulling them onto a sticky surface. They’re useful for detecting a problem early and tracking whether your efforts are working. The Natural History Museum in London uses a more advanced version of this approach, coating male moths in female pheromones so they attract other males instead of mating with females. This technique reduced moth numbers in their galleries by up to 50 percent.
Mothballs and Cedar: How Well They Work
Mothballs contain either naphthalene or paradichlorobenzene, both of which release fumes that can kill moths in an enclosed space. The key phrase is “enclosed space.” Mothballs only work inside airtight containers or sealed garment bags. Tossing them loosely into an open closet does almost nothing to moths while releasing chemicals linked to headaches, nausea, dizziness, and difficulty breathing. The fumes can spread through an entire house and be detected at concentrations as low as a few parts per billion.
Cedar blocks and cedar-lined chests have some repellent effect when fresh, but the oils that deter moths dissipate over time. Sanding the cedar periodically can restore some potency, but cedar alone is not reliable enough to protect valuable garments. It works best as a supplement to clean storage and airtight containers, not a replacement for them.
Inspecting Secondhand Items
Any time you bring home a secondhand wool, silk, fur, or feathered item, treat it before it goes into your closet. Launder it in hot water if the fabric allows, freeze it in a sealed bag for several days, or run it through a hot dryer cycle. This applies to thrift-store clothes, vintage rugs, inherited blankets, taxidermy, and even felt crafting supplies. A few minutes of prevention eliminates the most common way clothes moths establish themselves in a new home.