Do mothballs keep stink bugs and boxelder bugs out naturally?

Not as typically used, and not legally. Mothballs are a registered pesticide with a specific label — scattering them loosely in an attic or along a windowsill is off-label use, which is neither an EPA-endorsed application nor reliably effective against occasional invaders. Sealing the actual entry points is the evidence-backed fix; extension sources don't recommend mothballs for this purpose.

What actually keeps stink bugs and boxelder bugs out of my house?

Sealing the gaps they use to get in — around window and door frames, utility penetrations, soffits, and foundation cracks — before they start seeking shelter in fall. This is the single highest-leverage step because these insects aren't feeding indoors; they're overwintering, so once the entry points are closed, they simply can't get in the following season.

Does heat or freezing really kill clothes moths?

Yes. Extension sources specify heating infested items to 130°F for 30 minutes or freezing at 0°F for about four days kills all life stages; valuable or delicate items get a longer freeze at −4°F for seven days. Both are effective, chemical-free alternatives to mothballs for salvaging stored textiles, provided the temperature and duration are actually reached — a home freezer at typical settings may need longer than a commercial one.

Can natural methods get rid of bed bugs?

Heat is genuinely effective — bed bugs and their eggs die at sustained temperatures around 118–120°F, which is why laundering on hot and drying on high heat works for infested fabric items. But whole-room or whole-home bed bug elimination with DIY heat equipment is difficult to execute correctly and inconsistent heat is a common failure point; a persistent infestation usually needs a professional heat treatment or integrated approach.

Is diatomaceous earth effective against household invaders?

Food-grade DE can help in cracks and voids against crawling invaders when applied dry, but it stops working once it gets damp and needs reapplication — University of Minnesota Extension is explicit on this limitation, and it's a slow, contact-based kill rather than an instant one. Treat it as a supplemental tool alongside sealing gaps, not a standalone fix for occasional invaders or a substitute for heat/freeze on fabric pests.

Are natural household-pest methods safe for pets?

Keep DE application areas and any bait or trap out of pets' reach, and avoid concentrated essential-oil sprays or diffusers — sometimes marketed as natural repellents for stink bugs or moths — since they're toxic to cats and dogs per the ASPCA even in small amounts. Vacuuming, laundering, sealing gaps, and freezing infested textiles carry no pet-safety concern and are the methods to lean on around animals in the house.

Should I vacuum up stink bugs or boxelder bugs I find indoors?

Yes — vacuuming is a clean, chemical-free way to remove them, though both stink bugs and boxelder bugs can release a mild, somewhat unpleasant odor when disturbed or crushed. Empty the vacuum canister or bag outdoors right afterward rather than leaving it inside overnight, since a larger number of insects trapped in an enclosed bag can still produce a noticeable smell over time.

Why do I see the same invaders every fall and spring?

Because the entry points they used last year are still open. Occasional invaders don't breed indoors in meaningful numbers — they're using your walls as overwintering shelter, cycling in during fall's cooling temperatures and emerging on warm days in late winter and spring. Sealing gaps before the next fall breaks that cycle; spraying the ones you see does not.

How do I protect stored clothing from moths naturally?

Launder items before storing them, since moths are drawn to food and sweat residue on fabric rather than the fabric itself, then store the clean items in sealed containers rather than open boxes or cardboard. For already-infested valuable textiles, freezing at −4°F for seven days or heating to 130°F for 30 minutes kills all life stages — eggs, larvae, and adults — without any chemical treatment, per extension guidance.

When should I call a pro instead of handling this myself?

Call for a bed bug infestation beyond a single item (DIY heat is hard to execute reliably at scale), an occasional-invader problem that persists despite sealing, or if you can't identify what's actually invading. Anchor can identify the species, locate entry points a homeowner search might miss, and handle bed bug and fabric-pest cases that need more than a home freezer or washer.

Natural & OrganicHousehold Pests

Natural Control for Fall Invaders and Fabric Pests in NH Homes

TL;DR

New Hampshire's occasional invaders (stink bugs, boxelder bugs, elm seed bugs, sowbugs/pillbugs) and fabric pests (clothes moths, Indian meal moths, bed bugs) each have a clear best-lever. Exclusion before first frost is rated HIGH for invaders; heat/freeze and vacuuming are rated HIGH for fabric pests. Standalone essential-oil sprays and mothballs used off-label are rated LOW to MYTH — sealing and heat do the real work.

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NH License #782664Family-owned since 2017Updated Jul 2026

Why fall invaders show up at all
They seek overwintering shelter as temperatures drop, entering through unsealed gaps
University and extension IPM guidance on occasional invaders.
Clothes-moth kill treatment
Heat 130°F/30 min OR freeze 0°F for ~4 days; −4°F/7 days for valuables
UF/IFAS; Texas A&M AgriLife.
Bed bug heat threshold
Bed bugs and eggs die at sustained temperatures around 118–120°F
EPA / extension bed bug guidance.
Mothball reality
Mothballs are a registered pesticide — off-label use (loose, unsealed) is not a safe or legal application
EPA pesticide-label guidance.

The honest verdict

Does this actually work?

HIGH for exclusion (invaders) and heat/freeze (fabric pests); LOW for mothballs used off-label and standalone essential-oil sprays.

Works — Moderate

Evidence: Extension guidance consistently recommends exclusion before frost as the primary lever for occasional invaders, since they enter to overwinter rather than to feed. UF/IFAS and Texas A&M specify heat (130°F/30 min) or freeze (0°F for ~4 days; −4°F/7 days for valuables) as effective, chemical-free kill methods for fabric-pest life stages, and extension bed bug guidance places the kill threshold around 118–120°F sustained.

Works when

Gaps are sealed before fall's overwintering search begins
Infested or stored textiles are laundered hot or frozen at 0°F/−4°F for the specified duration
Vacuuming physically removes invaders, larvae, and eggs
DE is applied dry in cracks as a supplemental barrier

Fails when

Mothballs are scattered loosely instead of used per their EPA label
You rely on essential-oil sprays instead of sealing or heat/freeze
Freezing or heating doesn't reach the specified temperature or duration
Entry points remain open year after year

At a glance

Skip the mothballs and sprays — here's what actually keeps invaders and fabric pests out

How it works

Easy DIY

For occasional invaders (stink bugs, boxelder bugs, seed bugs, sowbugs), natural control means sealing the entry points they use to seek overwintering shelter, since they aren't feeding or breeding indoors in meaningful numbers. For fabric pests (clothes moths, Indian meal moths) and bed bugs, it means physically removing them via vacuuming and laundering, and using heat or cold to kill eggs and larvae in stored or infested textiles — mechanisms mothballs and scent repellents don't reliably match.

Vital stats

Time: A weekend for sealing; a single heat/freeze cycle for fabric-pest items
Best for: Fall/spring occasional invaders clustering on exterior walls or entering through gaps, and fabric pests or bed bugs in stored clothing, closets, and bedding.
Cost: Low — caulk, screens, and a household freezer/washer cover most of it

Stink bugs on the siding in October, a boxelder bug on the windowsill in March, or a hole in a wool sweater you pulled out of storage — these are different problems with one thing in common: the internet's favorite fix (mothballs scattered loosely, an essential-oil spray, a scent-based repellent) rarely holds up. Occasional invaders aren't trying to eat your house; they're trying to overwinter in it, and they get in through the same small gaps every year. Fabric pests aren't repelled by cedar or lavender so much as they're killed by heat, cold, and thorough cleaning.

The natural methods that genuinely work are unglamorous: seal the entry points before the fall search for shelter begins, vacuum and launder to physically remove fabric-pest larvae and eggs, and use heat or a hard freeze to kill what's left in stored textiles. This page grades the popular remedies honestly for New Hampshire's occasional invaders and fabric pests, and gives the sourced protocol that replaces them.

Step by step

How to do it

Identify what you're dealing with
Distinguish an occasional invader (stink bug, boxelder bug, seed bug, sowbug) from a fabric pest (clothes moth, Indian meal moth) or bed bug — the natural fix is different for each.
Tip: Occasional invaders cluster on sun-warmed exterior walls in fall; fabric pests show up as damage or larvae in stored textiles or dry goods.
Seal entry points before fall
Caulk gaps around window and door frames, utility penetrations, and soffits; add door sweeps and repair screens, prioritizing the sunniest exterior walls where invaders cluster.
Tip: Do this work in September, ahead of the fall overwintering search — sealing after they're already inside only helps next year.
Vacuum indoor invaders and fabric-pest larvae
Vacuum any invaders found indoors, along with closet corners, carpet edges, and baseboards where fabric-pest larvae and eggs collect.
Caution: Stink bugs and boxelder bugs can release a mild odor when disturbed — empty the vacuum outdoors afterward.
Launder or heat/freeze stored textiles
Launder infested items hot and dry on high heat, or freeze at 0°F for about four days (−4°F for 7 days for valuables) to kill all fabric-pest life stages before returning items to storage.
Caution: Confirm your freezer actually reaches and holds the target temperature for the full duration — a home unit may need longer than a lab freezer.
Store clean, seal tight
Store laundered textiles in sealed containers rather than open boxes, since moths are drawn to food and sweat residue left on unwashed fabric.
Tip: A cedar-lined chest offers mild, short-term repellency at best — it's not a substitute for laundering before storage.
Use DE dry as a supplemental barrier
Apply food-grade diatomaceous earth thinly and dry in cracks, closet corners, or pantry edges where invaders or fabric pests travel.
Caution: DE loses effectiveness once damp — reapply after cleaning or humidity exposure, and wear a dust mask during application.

What you need

Tools & materials

Caulk / weather-stripping
Seals the gaps occasional invaders use to enter
Prioritize sunny exterior walls and utility penetrations
Vacuum with hose attachment
Removes indoor invaders and fabric-pest larvae/eggs
Empty outdoors after use
Home freezer or hot washer/dryer
Kills fabric-pest and bed bug life stages via heat or cold
Confirm target temperature and duration are actually reached
Sealed storage containers
Prevents re-infestation of laundered/treated textiles
Glass or hard plastic preferred over cardboard
Food-grade diatomaceous earth
Supplemental dry barrier in cracks and voids
Apply thin and dry; reapply after moisture exposure

Products & actives

What to use — the label is the law

Product classes only — never a dosage. Always read and follow the product label.

Food-grade diatomaceous earth

Active class: Amorphous silica

Supplemental dry barrier in cracks/voids for crawling invaders

Food-grade only; apply dry and thin; wear a dust mask

Cedar blocks/chest

Active class: Cedar oil (natural)

Mild, short-term repellent supplement for stored textiles — not a substitute for laundering

Repellent only; refresh cedar surface periodically to maintain scent

Sticky monitoring traps

Active class: Adhesive (no chemical) / pheromone lure for pantry moths

Detects Indian meal moth activity in pantry areas

Monitoring tool, not eradication; keep from pets

Stay safe

Safety first

Pets
Caution
Avoid concentrated essential-oil sprays or diffusers marketed as natural repellents for invaders or moths — they're toxic to cats and dogs per the ASPCA. Keep DE application areas and sticky traps out of pets' reach.
General
Caution
Mothballs are a registered pesticide with a specific label; scattering them loosely in an attic, closet, or along a windowsill is off-label use and not a safe or legal application.
General
Low risk
DE silica dust can irritate airways if inhaled — apply thin, dry layers and wear a dust mask.
Children
Low risk
Keep any sticky or pheromone traps out of reach of young children.

Avoid these

Common mistakes

Why this method fails in practice.

Scattering mothballs loosely instead of sealing entry points
Spraying occasional invaders instead of finding and closing the gaps they used
Storing unwashed textiles, which attracts fabric pests via food/sweat residue
Freezing infested items for too short a time or at too warm a setting
Treating essential-oil sprays as a fix instead of a brief, unreliable repellent

New Hampshire context

Natural household-pest control in New Hampshire

New Hampshire's occasional invaders — boxelder bugs, elm seed bugs, western conifer seed bugs, brown marmorated stink bugs — follow the same fall pattern: they cluster on sun-warmed exterior walls seeking a way in as temperatures drop, then reappear on warm days in late winter and early spring. The single highest-leverage window is sealing gaps before the first hard frost, roughly October 19 (50% chance) to October 29 (80%) in Manchester per NOAA. Once they're inside a wall void, the honest advice is to leave them there until spring rather than trying to spray a void you can't fully reach.

Peak season

Fall entry before first frost; spring emergence on warm days

First-frost anchor: Manchester first hard frost ~Oct 19 (50%) / Oct 29 (80%) per NOAA 1991–2020

Sealing, vacuuming, laundering, and store-bought organic products are DIY-legal statewide; mothballs must be used per their EPA label, not loose or off-label.

UNH Cooperative Extension recommends exclusion before frost as the primary lever for NH's occasional invaders, consistent with regional extension guidance.

This method targets

Pests this applies to

Western Conifer Seed Bug

Brown Marmorated Stink Bug

Clothes Moth

Indian Meal Moth

Woodlouse

When to call a pro

General Pest Control with Anchor

Exclusion clears most occasional-invader problems and heat/freeze handles most fabric-pest cases, but a bed bug infestation beyond a single item, invaders persisting despite thorough sealing, or an unidentified pest calls for a professional look.

Call us when…

Bed bugs are present beyond a single treatable item
Occasional invaders keep returning despite sealing all found gaps
You can't identify what's actually invading your home
A fabric-pest infestation has spread across multiple closets or rooms
You need entry points found in hard-to-inspect areas like soffits or high gables

General Pest Control

free inspection; same-day service across southern and central New Hampshire.

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Keep them out

Seal exterior gaps before the first hard frost each fall
Launder textiles before storing them in sealed containers
Repair window and door screens each spring

Common questions

Frequently asked

Sources & further reading(4)

[1]
UF/IFAS Extension — Clothes Moths and Carpet Beetles
Heat/freeze kill thresholds and durations for fabric pests
extensionverified 2026-07-13
[2]
Texas A&M AgriLife Extension — Food and Fabric Pests
Freezing duration for valuable/delicate stored textiles
extensionverified 2026-07-13
[3]
University of Minnesota Extension — Diatomaceous Earth
DE effective only when dry; reapplication after moisture
extensionverified 2026-07-13
[4]
ASPCA — Essential Oils and Pets
Concentrated essential oils toxic to cats and dogs
medicalverified 2026-07-13

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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Anchor Pest Services

When household pests won't quit, we will.

Same-day service across Southern New Hampshire. NH-licensed #782664. Family-owned since 2017. We diagnose the pest, then treat it the right way — with a satisfaction guarantee.

Get a free inspection Call (603) 785-0118

Keep Exploring

Natural Control for Fall Invaders and Fabric Pests in NH Homes

Works when

Fails when

Skip the mothballs and sprays — here's what actually keeps invaders and fabric pests out

How it works

How to do it

Identify what you're dealing with

Seal entry points before fall

Vacuum indoor invaders and fabric-pest larvae

Launder or heat/freeze stored textiles

Store clean, seal tight

Use DE dry as a supplemental barrier

Tools & materials

Caulk / weather-stripping

Vacuum with hose attachment

Home freezer or hot washer/dryer

Sealed storage containers

Food-grade diatomaceous earth

What to use — the label is the law

Food-grade diatomaceous earth

Cedar blocks/chest

Sticky monitoring traps

Safety first

Common mistakes

Natural household-pest control in New Hampshire

Pests this applies to

General Pest Control with Anchor

Call us when…

Keep them out

Frequently asked

Do mothballs keep stink bugs and boxelder bugs out naturally?

What actually keeps stink bugs and boxelder bugs out of my house?

Does heat or freezing really kill clothes moths?

Can natural methods get rid of bed bugs?

Is diatomaceous earth effective against household invaders?

Are natural household-pest methods safe for pets?

Should I vacuum up stink bugs or boxelder bugs I find indoors?

Why do I see the same invaders every fall and spring?

How do I protect stored clothing from moths naturally?

When should I call a pro instead of handling this myself?

When household pests won't quit, we will.

Your next step

Bed Bug Treatment

Mechanical Control for Fall Invaders, Bed Bugs & Fabric Pests

What natural methods work for boxelder bugs?

Household Pest Prevention: Seal, Store, and Time It Right

Chemical Control for Occasional Invaders, Fabric Pests & Bed Bugs