Which moth is actually in my house in winter?

Almost certainly a pantry moth, formally called the Indian meal moth, or a clothes moth — both live indoors year-round in heated homes and don't follow a seasonal pattern at all. Pantry moths are drawn to stored grains, cereals, dried fruit, nuts, and pet food, while clothes moth larvae feed on wool, fur, feathers, and silk. The 'winter moth' you may have heard of is not one of these; it's an outdoor species whose adults fly in cold weather but never come inside a structure.

Do pantry moths go dormant in winter?

No. In a heated New Hampshire home, pantry moths breed continuously regardless of the season, since indoor warmth — not the calendar — drives their life cycle. Under warm conditions, a single generation can go from egg to adult in roughly 30 to 50 days, meaning an untreated infestation can multiply steadily through the coldest months just as easily as in summer. There's no winter slowdown to wait out; the only effective response is finding and removing the infested food source.

Why is a moth named 'winter moth' not actually in my house?

The winter moth gets its name because its adults are unusually active in cold weather, flying from mid-to-late November — often before Thanksgiving — into January, when almost no other moths are on the wing. But its entire life cycle happens outdoors: males fly to find females resting on tree trunks, mated females lay eggs directly on bark, and those eggs overwinter in place. There's no stage of its life cycle that involves sheltering inside a building.

When do winter moths fly in New Hampshire?

Adult winter moths typically emerge from soil pupae and begin flying in mid-to-late November, often appearing before Thanksgiving, and activity can continue into January on nights that stay above freezing. Males are the ones most commonly noticed, swarming around porch lights and holiday lighting after dark. This late-fall flight window is unrelated to the entry timing of overwintering house-invading insects like cluster flies or boxelder bugs, which enter buildings well before the winter moth even emerges.

What do winter moth caterpillars actually do?

Eggs laid on tree bark the previous winter hatch in early spring, and the resulting tiny caterpillars feed on developing buds and leaves of oaks, maples, cherries, apples, and blueberries. In heavy outbreak years, a single tree can host as many as 100,000 caterpillars, causing significant defoliation. Feeding continues until roughly mid-June, when mature larvae drop to the soil to pupate and remain there until the adults emerge again in late fall — this is strictly a tree-health issue, not a household one.

How do I tell a pantry moth from a clothes moth?

Pantry (Indian meal) moths are the ones you typically see flying around the kitchen or pantry, with two-toned wings that look coppery-reddish on the outer half and grayish near the body. Clothes moths are smaller, tend to avoid light, and are usually found near closets or storage areas containing wool, fur, or silk rather than flying openly through a room. If you're finding damage to fabric specifically, it's a clothes moth; if it's near stored food, it's a pantry moth.

Do clothes moths ever slow down or overwinter?

Clothes moths stay active year-round indoors in a heated building, with no true dormant or overwintering period the way outdoor insects experience. The one meaningful exception is temperature-driven: larvae become inactive once conditions drop below about 40°F, which is exactly why cold storage is an effective, non-chemical way to protect valuable wool or fur items — a properly chilled storage space halts feeding even though the moth itself isn't hibernating in any biological sense.

Can I prevent pantry moths on a seasonal schedule?

No — because pantry moths breed year-round in heated homes, there's no seasonal window where prevention matters more or less than any other time. Effective prevention is a continuous habit: store dry goods like grains, cereal, and pet food in airtight containers, inspect groceries for webbing or larvae before they go in the pantry, and rotate older stock regularly so infestations don't have time to establish. Treating this as an ongoing routine, rather than a once-a-year task, is what actually keeps pantry moths out.

Daniel Brady · NH-Licensed Pesticide Applicator · License #782664

|Reviewed by Daniel Brady

Where Do Moths Go in the Winter? NH Moth Timing Guide

Overwintering Invaders

Moths seen indoors in a New Hampshire winter are almost always pantry (Indian meal) moths or clothes moths, both of which breed continuously in heated homes with no real seasonal pause — pantry moths in stored food, clothes moths in wool, fur, or feathers. The outdoor winter moth is a different insect entirely: its males fly in the cold, typically mid-to-late November into January, but it overwinters as eggs laid on tree bark and its caterpillars defoliate trees the following spring. It never enters homes, so if a moth is genuinely inside your house, treat it as a food or textile problem, not a seasonal one.

At a glance

Indoor moth cycle: Egg to adult in ~30–50 days (warm)Pantry moths breed year-round in heated homes with no dormant season.
Clothes moth larvae: Inactive below 40°FCold storage protects wool from active feeding.
Winter moth flight: Mid-late Nov–JanAdult males emerge from soil pupae, usually before Thanksgiving.
Winter moth eggs: 150–350 per female, laid on barkEggs overwinter outdoors and hatch in early spring, defoliating oaks and maples.

Indoor moth cycle
Egg to adult in ~30–50 days (warm)
Pantry moths breed year-round in heated homes with no dormant season.
Clothes moth larvae
Inactive below 40°F
Cold storage protects wool from active feeding.
Winter moth flight
Mid-late Nov–Jan
Adult males emerge from soil pupae, usually before Thanksgiving.
Winter moth eggs
150–350 per female, laid on bark
Eggs overwinter outdoors and hatch in early spring, defoliating oaks and maples.

The timing answer

The short of it

The verdict · overwintering invaders

Pantry/clothes moths breed indoors year-round

The moth truly inside your house in winter is a pantry (Indian meal) or clothes moth breeding year-round in food or wool — the 'winter moth' lives outdoors.

NH activity calendar

When are they active — the whole year at a glance

Indoor pantry and clothes moths run on a heated-home clock with no real winter pause, while the unrelated outdoor winter moth follows the opposite pattern — flying only in late fall and overwintering as eggs on bark.

12-month activity · New Hampshire

Peak · JulYou are here · Aug

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

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Nov

Dec

PeakActiveBuildingDecliningDormantCurrent season · Summer

Best window to act · Act immediately upon seeing adult moths or webbing — this is source-driven, not seasonal. Find and discard infested food for pantry moths, or clean and cold-store wool for clothes moths, and use pheromone traps to monitor ongoing activity.

What else peaks thenJul

Indoor pantry and clothes moths have no frost-driven season — heated homes remove the seasonal cue, so their calendar is set by the food or textile source, not the weather. The outdoor winter moth follows its own separate, tree-based schedule (late-fall flight, spring caterpillars).

Where they go in winter

Winter behavior

The honest answer to 'where do moths go in winter' depends entirely on which moth you mean — and for the ones actually in your house, the answer is 'nowhere, they never left.'

Overwintering strategy

Active all winter

Pantry and clothes moths don't overwinter in the outdoor sense — they live and breed continuously indoors year-round in heated New Hampshire homes, in pantry food or in wool and fur. The outdoor winter moth is the opposite: it spends winter as eggs on tree bark, with adults emerging from soil in late fall to mate, lay eggs, and die; none of them shelter indoors.

Move in
Pantry moths typically arrive already inside infested groceries, while clothes moths arrive on infested textiles or secondhand goods — either can happen at any time of year.
Active all winter
Pantry and clothes moths don't overwinter in the outdoor sense — they live and breed continuously indoors year-round in heated New Hampshire homes, in pantry food or in wool and fur. The outdoor winter moth is the opposite: it spends winter as eggs on tree bark, with adults emerging from soil in late fall to mate, lay eggs, and die; none of them shelter indoors.
Spring exit
There is no seasonal exit for indoor moths; effective control means removing the food or textile source directly rather than waiting for a change in season.

Season by season

A year in the life

Indoor moths run on a near-constant cycle in New Hampshire homes, while the outdoor winter moth follows a completely separate, tree-based calendar.

01
Spring
Pantry and clothes moths continue their indoor breeding cycles uninterrupted. Outdoors, winter-moth eggs laid the previous December hatch and tiny caterpillars begin defoliating buds and leaves — a landscape and tree-health issue, not a household one.
02
Summer
Peak pantry-moth breeding season, since warm indoor temperatures shorten the egg-to-adult cycle to just a few weeks and infestations can grow quickly if unaddressed. The outdoor winter moth is dormant this whole season as pupae resting in the soil.
03
Fall
Indoor pantry and clothes moths persist without any real change. Outdoors, adult winter moths emerge from the soil in late November — often before Thanksgiving — and males flutter conspicuously around porch and holiday lights.
04
Winter
Indoor moths keep breeding in heated New Hampshire homes with no seasonal slowdown. Outdoors, winter-moth adults finish mating and laying eggs on bark by January, then die, leaving only dormant eggs to overwinter until spring.

New Hampshire context

Moths in southern New Hampshire homes

In Manchester, Nashua, and Concord, the moths homeowners actually find indoors in winter are pantry and clothes moths, both of which thrive in the stable warmth of a heated New England home regardless of what's happening outside. The outdoor winter moth, first a significant concern in coastal Massachusetts, has since spread into New Hampshire and is a genuine tree-health issue for oaks, maples, and fruit trees — but it is a landscaping and tree-care matter, handled with dormant oil and spring monitoring, not a pest-control call about the house itself.

Key local data

Winter moth reached coastal New Hampshire after spreading north from the Boston area, and the introduced parasitoid fly Cyzenis albicans — released across New England beginning in 2004 — is now established widely enough that NH winter-moth populations no longer cause noticeable defoliation (UMass Extension; Elkinton et al. biological-control program). Indoor pantry and clothes moths are unaffected by any of this — they breed year-round in heated homes regardless of the outdoor season.

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When to act

Timing your treatment

Because indoor pantry and clothes moth activity is driven by a food or textile source rather than the calendar, the right time to act is the moment you see adults or larvae, not a particular season.

The right window

Act immediately upon seeing adult moths or webbing — this is source-driven, not seasonal. Find and discard infested food for pantry moths, or clean and cold-store wool for clothes moths, and use pheromone traps to monitor ongoing activity.

Repeat sightings despite discarding suspected food sources

Webbing or larvae found in multiple pantry items

Visible damage to stored wool, fur, or clothing

Infestations that recur after a cleanup attempt

Uncertainty over whether it's a pantry moth or a clothes moth

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Learn more about this pest

Common Questions

Frequently asked

Sources & references

Penn State Extension — Indian Meal Moth
year-round indoor breeding, ~30–50-day life cycle
Penn State Extension — Clothes Moth
larvae feeding on wool/fur, year-round indoor presence
Rutgers NJAES — Clothes Moths FS1182
larvae inactive below 40°F
UMass Extension — Winter Moth
mid-late November flight timing, eggs laid on bark, NH range
Elkinton et al. — Successful biological control of winter moth in the northeastern United States (PubMed 33749016)
Cyzenis albicans releases from 2004, NH populations no longer causing noticeable defoliation
UMass Extension — Insect & Mite Guide: Operophtera brumata
150–350 eggs per female, defoliation impact
Mass Audubon — Winter Moths
egg overwintering, caterpillar host trees
UC IPM — Clothes Moths and Carpet Beetles
pantry vs. clothes moth identification

Editorial disclaimer: This content is provided for informational purposes only and does not constitute pest control advice. Every property is unique — consult a licensed professional for guidance specific to your situation. Anchor Pest Services is licensed in New Hampshire (#782664).

Written & reviewed by

Verified

Daniel Brady

NH-Licensed Pesticide Applicator · License #782664 (NHDAMF, RSA 430)

Daniel Brady is the New Hampshire–licensed applicator behind Anchor Pest Services, a family-owned pest control company serving the Manchester area since 2017.

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Last updated Jul 2026

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Keep Exploring

Where Do Moths Go in the Winter? NH Moth Timing Guide

The short of it

When are they active — the whole year at a glance

Winter behavior

A year in the life

Spring

Summer

Fall

Winter

Moths in southern New Hampshire homes

Timing your treatment

Frequently asked

Sources & references

Whatever the season — we handle the timing for you.

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Where Do Moths Go in the Winter? NH Moth Timing Guide

The short of it

When are they active — the whole year at a glance

Winter behavior

A year in the life

Spring

Summer

Fall

Winter

Moths in southern New Hampshire homes

Timing your treatment

Frequently asked