Clothes moths go through four life stages: egg, larva, pupa, and adult. The full cycle takes roughly 65 to 90 days under favorable conditions, but the larval stage alone can stretch anywhere from one month to two years depending on temperature, humidity, and food supply. Understanding each stage helps you figure out where the damage is happening and how to stop it, because only the larvae, not the flying adults, actually eat your clothes.
Egg Stage: Where It Starts
A female clothes moth lays clutches of 40 to 50 eggs, typically depositing them directly on or near a food source like wool, fur, or silk. The eggs are tiny, about the size of a pinhead, and nearly impossible to spot with the naked eye. In warm weather, they hatch in as few as 4 to 10 days. Cooler or drier conditions slow things down, with hatching taking up to 21 days. Low indoor humidity makes the environment less hospitable for development at every stage, starting here.
Larval Stage: The Only Stage That Causes Damage
The larva is the entire reason clothes moths are a problem. These small, worm-like caterpillars are shiny white or cream-colored with brown heads, and they have no eyes (in the webbing species) or only a simple eye on each side (in the casemaking species). They feed exclusively on animal fibers: wool, fur, silk, feathers, felt, and leather. All of these materials contain keratin, a fibrous protein that 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 or body oils. In the wild, these same larvae feed on bird nests and animal carcasses.
The larval stage is also the most variable. Under warm, humid conditions with plenty of food, larvae can develop in as little as 35 days. But in cooler environments or when food is scarce, development can drag on for up to two and a half years. This extreme range is why infestations can seem to appear out of nowhere. Larvae may have been feeding slowly inside a closet, trunk, or storage bin for months before any visible damage shows up.
Larvae tend to feed in hidden spots. You’ll commonly find damage under collars, along cuffs, in folds, and in other concealed parts of clothing where the fabric stays undisturbed. They avoid light and rarely venture out into the open.
Pupal Stage: The Quiet Transition
Once a larva has eaten enough to reach full size, it spins a silken cocoon and pupates. This is a resting phase during which the larva transforms into an adult moth. The pupal stage is relatively short compared to the larval phase and is typically completed within the overall 65-to-90-day cycle. Pupae are often found in the same hidden areas where larvae were feeding, tucked into fabric folds or along seams.
Adult Stage: Short-Lived and Harmless to Fabric
Adult clothes moths do not eat at all. They have no functional mouthparts for feeding on fabric. Their sole purpose is to mate and lay eggs, and they typically live only a few weeks. Adults are small, about a quarter inch long at rest, with narrow wings that fold flat against the body. They avoid light and tend to flutter weakly rather than fly strongly, which distinguishes them from pantry moths and other household species that are drawn to lamps and windows.
If you’re seeing small moths flying around your closet or bedroom, the infestation is already well underway. The larvae that hatched weeks or months ago have been feeding this whole time, and the adults you’re seeing are now laying the next generation of eggs.
Webbing vs. Casemaking Clothes Moths
Two species cause most clothes moth damage in homes, and their larvae behave differently in ways that affect what you’ll see during an infestation.
Webbing clothes moths are the more common species. Their larvae spin silken tubes or patches as they graze across fabric, creating a feeding tunnel made of fibers, silk, and fecal particles. This tube isn’t portable; the larva builds it in place. Adults are golden with shiny scales, reddish-gold tufts of hair on the head, black eyes, and spotless wings about half an inch wide.
Casemaking clothes moths are less common but equally destructive. Their larvae build a portable silken case that they carry with them wherever they go, feeding from the open ends and retreating inside when disturbed. The case often picks up dyes from whatever fabric the larva has been eating, so it may appear tinted. The larval feeding period for casemaking moths is narrower, typically 68 to 87 days, compared to the webbing moth’s range of 35 days to two and a half years. Adults are similar in size but slightly brownish-gold with three faint spots on the wings and lighter-colored head hair.
What Speeds Up or Slows Down the Cycle
Temperature and humidity are the two biggest factors controlling how quickly clothes moths reproduce. Warm, humid environments accelerate every stage. Eggs hatch faster, larvae grow faster, and generations turn over more quickly. This is why infestations are more common in closets with poor air circulation, attics in warm climates, and storage areas where garments sit undisturbed for long periods.
Keeping indoor humidity low is one of the most effective environmental controls. Dry air slows egg hatching, extends the larval stage, and generally makes your home less favorable for clothes moth development. Regular use of items also helps: larvae thrive on clothing that sits untouched for weeks or months. Simply wearing, brushing, or shaking out garments periodically disrupts their feeding and exposes them to light they actively avoid.
Signs of an Active Infestation
Because larvae hide and adults don’t eat fabric, you’ll usually notice the damage before you notice the moths. Look for irregular holes in wool sweaters, thinning patches on rugs, or bare spots on fur and felt items. Silken webbing or tubes on the surface of fabric indicate webbing clothes moths. Small, dyed cigar-shaped cases clinging to fabric point to the casemaking species. Tiny sand-grain-sized fecal pellets the same color as the fabric are another telltale sign.
Check the most vulnerable spots first: the undersides of collars, hems, cuffs, fabric folds, and anywhere garments touch each other in a packed closet. Larvae concentrate in these dark, undisturbed areas. If you find adult moths, look beyond the immediate area. Eggs could have been laid on any animal-fiber item in the room, and larvae may already be feeding in places you haven’t checked yet.
Breaking the Cycle
Effective control targets the stages that matter most. Since larvae are the only stage that feeds and causes damage, and since eggs are constantly being laid by adults, you need to interrupt both ends of the cycle. Washing infested items in hot water or running them through a hot dryer kills eggs and larvae. For items that can’t be washed, sealing them in plastic bags and freezing them for several days can also be effective.
Thorough vacuuming of closets, baseboards, and storage areas removes eggs, larvae, and the hair and lint debris they feed on. Pheromone sticky traps attract adult males and can help you monitor whether moths are present, but they won’t eliminate an infestation on their own since they don’t target females or larvae. For valuable textiles, airtight storage with cedar or lavender can deter egg-laying, though these repellents lose potency over time and won’t kill larvae already present.
The most important thing to understand about the clothes moth life cycle is its variability. A generation can turn over in just over two months or stretch across two full years. That means a single overlooked wool blanket in a storage bin can harbor a slow-burning infestation that seeds moths throughout your home long after you thought the problem was resolved.