Mar 5, 2021 | Pest Control
Millipedes are long, wormlike animals that are also referred to as worms, wireworms, and armyworms. While often mistaken for centipedes, millipedes are smaller (1 to 1-1/4 inches in length) with dark brown coloring and shiny, hard shells. They have long cylindrical bodies and have a habit of curling into a ball when they are disturbed. While the name millipede might imply they have thousands of legs, in reality they typically have 4 legs per body segment and at least 60 legs total, although some species can have up to 160 legs. Millipedes are harmless to humans as they cannot sting or bite. They also do not feed on plants or wooden structures. What they do feed on is decaying plant material and prefer damp, moist environments where they thrive. They are often found under leaves, plant debris, mulch, pine needles and other similar habitats.
While there is no set millipede season, they do go on mass migrations twice per year – once in the spring and once in the fall. These usually occur on warm, humid nights where they will emerge by the hundreds. Millipedes are outdoor pests so finding them inside your home means they have wandered in by mistake. In fact, millipedes cannot reproduce indoors. When these pests do make their way indoors, they are often found in garages and basements. Millipedes are nocturnal when they wander out of their hiding places roaming aimlessly. They eventually crawl back into holes or cracks (oftentimes in our homes) to escape the dryness of the impending daytime. They can often be found hiding under the edge of the garage door, in cracks along the exterior of your home, in sidewalk or driveway cracks, and in the gaps of your foundation.
Although millipedes are harmless, they can become a nuisance when they make their way into your home en masse. While there is no definitive millipede control method, the best practice is to try and keep them outdoors as best as possible. Because they often wander in through cracks and gaps, make sure these and other entry points around doors, windows, and foundations are sealed. They feed on organic material so keeping mulch, pine needles, and dead leaves away from your home will also help. Ensure gutters are not clogged and downspouts are angled away from foundations as this dampness will attract them in droves. Using insecticides on millipedes indoors is usually considered unnecessary as they will die in a short period of time due to lack of moisture. The best option to get rid of them indoors is to sweep or vacuum them up and discard them. Once the cold weather hits, they will become dormant… at least until springtime rolls around again!
If you have a problem with millipedes or any other household pests, contact your local pest control company for a free analysis.
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Nov 6, 2020 | Pest Control
By Anna V., Editorial Lead — Pest Education · Last updated: May 2026
If you’ve found millipedes in your house and want to get rid of them without spraying chemicals, you’re in the right place. At Northwest, we run millipede calls across Georgia, Alabama, Tennessee, and South Carolina nearly every week during the spring and fall rainy seasons. The good news: millipedes are harmless (no bites, no stings, no property damage) and they respond well to natural removal methods. Most homeowners can solve a millipede problem in their house with a few changes around the foundation, a dehumidifier, and some basic sealing. No pesticides required.
Here’s the realistic version of natural millipede control: what actually works, what doesn’t, and what to do when DIY methods aren’t enough.
A cluster of millipedes along a basement baseboard usually shows up within 48 hours of heavy rain.
What Are Millipedes and Why They Enter Homes
Millipedes are segmented arthropods that thrive in moist, dark environments. They eat decaying plant matter, not your home, your food, or any living thing inside. They’re slow movers, they don’t bite, and they don’t carry disease. They’re a nuisance pest, not a hazard.
Three things drive millipedes into Southeast homes:
- Wet weather and saturated soil. Heavy spring or fall rain pushes millipedes from their outdoor habitat (mulch, leaf litter, soil) toward drier ground. Sometimes that drier ground is your basement.
- Drought and dehydration. Extended dry weather has the opposite effect — millipedes seek any source of moisture, which can include indoor humidity from bathrooms, basements, and crawl spaces.
- Foundation conditions. Mulch beds against the house, leaf litter near the foundation, downspouts emptying close to the wall, and ground-level cracks all combine to make your home the easiest moisture refuge in the neighborhood.
For more on why millipedes appear and how to identify them (including the millipede vs centipede confusion most homeowners run into), see our companion guide on why there are so many household millipedes in your home.
Signs of a Millipede Infestation
Most millipede problems are obvious. You see them moving on the floor or curled up dead in corners. Other signs:
- Live sightings in basements, bathrooms, garages, crawl spaces, or laundry rooms.
- Trails of curled, dehydrated millipedes in damp corners. They enter looking for moisture and die when they don’t find enough.
- Clusters near entry points: gaps under doors, foundation cracks, basement window wells.
- Movement within 24 to 48 hours after a major rain event.
- Shed exoskeletons in undisturbed corners (suggests an established indoor population).
Natural Methods to Get Rid of Millipedes in Your House
The most effective natural millipede control isn’t a product. It’s removing the conditions that attract them in the first place. Five categories of natural methods, ranked by effectiveness.
Moisture control does most of the work. Essential oils are short-term help at best.
1. Remove Moisture Sources (The Most Effective Method)
Millipedes can’t survive indoors without moisture. Remove the moisture, and the indoor population resolves itself within days. Steps:
- Fix all leaky pipes and faucets. Even slow drips support indoor millipede populations.
- Run a dehumidifier in basements and crawl spaces. Target relative humidity below 50%. Most home improvement stores carry units in the 30 to 70 pint range; a 50-pint dehumidifier handles most Southeast basements.
- Improve ventilation in bathrooms (exhaust fan that vents outside, not into the attic), laundry rooms (proper dryer vent), and crawl spaces (functional vents or encapsulation).
- Address standing water in floor drains, sink overflows, sump pump pits, and condensation around HVAC units.
This is the single highest-impact natural method. Most homes with persistent millipede problems are also homes with chronic moisture issues. Solve one, you usually solve the other.
2. Seal Entry Points
Millipedes can only enter through gaps. Sealing them is the only way to keep new arrivals out for good.
- Caulk foundation cracks at ground level.
- Install or replace door sweeps and weatherstripping (especially garage side doors and basement hatches).
- Screen crawl space vents with galvanized 1/4-inch hardware cloth.
- Cover window wells with rigid plastic or metal covers.
- Seal gaps around utility line penetrations with steel wool packed into the gap, then caulk over the top.
- Check brick weep holes; screen them with a fine mesh if they’re large enough for millipedes to enter.
3. Reduce Clutter and Hiding Spots
Damp clutter holds moisture and creates millipede shelter. Decluttering reduces both:
- Clear stacks of cardboard, magazines, and stored papers from damp basement floors.
- Move stored items off the floor onto shelves or pallets.
- Transfer storage from cardboard to plastic bins. Cardboard absorbs moisture and is itself a food source for millipedes.
- Keep basement and crawl space corners clean and dry.
4. Diatomaceous Earth
Diatomaceous earth (DE) is a fine powder made from fossilized aquatic organisms. The microscopic edges damage the exoskeleton of insects and arthropods that crawl through it, causing dehydration. Food-grade DE is safe for use around children and pets when applied lightly.
Where to apply:
- Light dusting along baseboards in basements and crawl spaces
- Around foundation cracks and door thresholds
- Inside crawl space access doors
- Reapply after vacuuming or any moisture exposure (DE loses effectiveness when wet)
Caution: don’t over-apply. A visible white layer on baseboards isn’t more effective than a thin barely-visible dusting. It just creates a cleanup project. DE works on millipedes that crawl through it, not on millipedes that don’t.
5. Essential Oils and Natural Repellents
Cedar oil, peppermint oil, and tea tree oil all show modest, short-term repellent effects against millipedes. Mix 10 to 15 drops of essential oil per cup of water in a spray bottle and apply around entry points, baseboards, and any spots where you’ve seen millipede activity.
Honest expectations: scent-based repellents fade within 24 to 72 hours and need frequent reapplication. They’re a supplement to moisture control and sealing, not a substitute. Use them as a short-term measure while you address the underlying conditions.
What about vinegar? Equal parts vinegar and water sprayed around entry points has anecdotal support but limited research backing. It’s safe and cheap so there’s no harm in trying, but don’t expect it to solve a persistent problem on its own.
Step-by-Step DIY Removal Guide
If you have an active millipede problem and want to handle it naturally, follow this sequence:
- Identify entry points. Walk the perimeter of the basement, crawl space, or affected room. Look for cracks, gaps under doors, unsealed pipe penetrations, and dampness on walls.
- Reduce indoor humidity. Plug in a dehumidifier in the affected area. Set it to 45 to 50% relative humidity. Run continuously for at least 2 weeks.
- Address the outdoor conditions. Pull mulch back 3 feet from the foundation. Remove leaf litter against the house. Make sure downspouts extend at least 4 feet from the foundation.
- Vacuum visible millipedes. Empty the canister outside immediately to avoid odor buildup.
- Apply diatomaceous earth in a thin dusting at known entry points and along baseboards in affected areas.
- Seal entry points as a final step, after the indoor population has cleared. Caulking, door sweeps, hardware cloth on vents.
- Maintain. Re-check entry points seasonally. Run the dehumidifier through humid months. Keep mulch beds away from the foundation.
A dehumidifier set to 45-50% humidity is the single highest-impact change for keeping millipedes out long-term.
Preventing Millipedes from Entering Your House Long-Term
Once you’ve cleared an active problem, prevention focuses on the conditions that allowed millipedes in the first place.
- Seal cracks and gaps in doors, windows, and foundations seasonally. The Southeast freeze-thaw cycle and soil expansion can open new gaps each year.
- Maintain a 3-foot mulch-free zone around the foundation. Use gravel, river rock, or bare soil within 3 feet of the house. Move mulch beds farther out.
- Remove leaves, mulch, and organic debris from the foundation perimeter regularly. Fall raking is especially important.
- Direct downspouts away from the foundation. Add extensions if needed. Standing water within 2 feet of the house is the single biggest contributor to millipede entry.
- Control indoor humidity with dehumidifiers, proper ventilation, and prompt leak repair.
- Trim back vegetation so air circulates against the foundation. Damp shaded foundation walls hold millipedes longer.
When Natural Methods Aren’t Enough
Most millipede problems clear up with the natural methods above. Some don’t. Call Northwest for professional millipede control if:
- You’ve followed the DIY steps for 3 to 4 weeks and millipede sightings haven’t dropped significantly.
- You’re finding more than 10 to 15 millipedes per day in any single room.
- You can’t identify the entry points or moisture source on your own.
- You’re dealing with millipedes plus other moisture pests (sowbugs, springtails, centipedes, ground beetles). All share the same root cause and can be solved together.
- The home has chronic crawl space moisture, drainage problems, or other structural issues contributing to the millipede problem. Professional pest control + targeted moisture remediation handles both layers.
The UGA Extension Bulletin B 1412 on Southeastern household pests recommends professional pest control when DIY moisture management hasn’t reduced indoor millipede activity within a few weeks.
(Tried the natural methods and millipedes keep coming back? Request a free Northwest inspection and we’ll find the entry points and moisture sources driving them in.)
Millipedes In House: Southeast Seasonal Patterns
Millipede pressure in Georgia, Alabama, Tennessee, and South Carolina follows a predictable rhythm. Plan prevention around it.
- March through May: Spring rains drive the first major peak. Foundation perimeter prep (mulch pullback, downspout checks) is best done in late February or early March before the rainy season.
- June through August: Summer thunderstorms produce intermittent peaks. Dehumidifier should be running continuously in basements during this period.
- September through November: Fall rains and cooler nights drive the second annual peak. This is the period when most homeowners notice clusters of curled, dead millipedes in basement corners.
- December through February: Activity drops significantly. Use this window for entry-point sealing and structural prevention work, since indoor millipede pressure is at its lowest.
Frequently Asked Questions About Millipedes in the House
Are millipedes harmful to humans or pets?
No, millipedes are harmless. They don’t bite, sting, transmit disease, or damage homes. Some species release a mild defensive secretion when handled, which can briefly irritate skin and shouldn’t be eaten by pets in large numbers, but otherwise they’re entirely safe to have around.
Why do millipedes come inside my home?
They’re seeking moisture, warmth, and shelter. Heavy rain saturates their outdoor environment and pushes them indoors looking for drier ground. Drought has the opposite effect; they seek any source of moisture, which can include indoor humidity. Foundation mulch, leaf litter, and entry-point gaps make some homes much easier targets than others.
How do I prevent millipedes indoors permanently?
Three layers: (1) reduce indoor humidity with a dehumidifier and leak repair, (2) seal all entry points (foundation cracks, door gaps, crawl space vents), and (3) maintain a 3-foot mulch-free zone around the foundation. The first two address current entries; the third reduces outdoor pressure year-round.
Can essential oils keep millipedes away?
Cedar, peppermint, and tea tree oils show modest short-term repellent effects against millipedes. Mix 10 to 15 drops per cup of water and spray around entry points. Expectations: they fade within 24 to 72 hours and need frequent reapplication. Use them as a supplement to moisture control and sealing, not a substitute.
Does diatomaceous earth kill millipedes?
Yes, food-grade diatomaceous earth (DE) damages the exoskeleton of millipedes that crawl through it, causing dehydration. Apply a thin dusting at baseboards and entry points in affected areas. Reapply after vacuuming or any moisture exposure, since DE loses effectiveness when wet.
Most natural millipede solutions work. When they don’t, the underlying issue is usually structural moisture that needs more attention.
Solve the Millipede Problem at the Source
Natural millipede control works well for most homeowners. When it doesn’t, the underlying issue is usually structural moisture or hard-to-find entry points that need professional eyes. Northwest’s team handles the full workflow: moisture assessment, entry-point sealing, targeted eco-friendly treatment, and prevention plans tied to Southeast seasonal patterns.
About the Author
Anna V., Editorial Lead — Pest Education leads pest education content for Northwest Exterminating, working with senior technicians and service center managers across our Georgia, Alabama, Tennessee, and South Carolina service areas to translate field expertise into homeowner-friendly guides. The focus: accurate, regionally-specific answers to the pest questions Southeast homeowners are actually searching for.
Jul 17, 2020 | Pest Control
Millipedes are common occasional pests that are found throughout the United States. While they typically live outdoors under leaves, mulch, compost, rocks, etc, they will come indoors for two reasons: in search of water during droughts or in search of shelter after heavy rains. They are often found infesting basements, garages, and crawlspaces. If you spot millipedes in your house, it is highly likely that they are breeding somewhere in your lawn.
Millipedes are decomposers meaning their diet primarily consists of damp, decaying plant material. Because of this, they are quite beneficial to have in your garden. While they are harmless to humans, millipedes can become a nuisance if they infest your home in large numbers. Prevention is the best method of millipede control. Here are some tips you need to know about how to keep millipedes away from your home.
Remove Attractants
If there is nowhere for millipedes to hide or breed then they can’t infest your home. Prevent millipedes by removing mulch, leaves, grass clippings, boards, woodpiles, rocks, boxes, etc. from your yard, especially if they are near foundations. If you are unable to remove them completely, try to elevate them off the ground. Try not to overmulch your flowerbeds.
Eliminate Moisture
What attracts millipedes is moisture, especially in crawlspaces and around foundations. Make sure your gutters are clear and properly functioning. Consider installing gutter guards to help prevent clogs. Make sure downspouts are pointed away from foundations and use splash blocks to keep water away from foundation walls. Consider installing tiles or drains or sloping the ground so water drains away from foundations. Repair any leaky pipes, appliances, or faucets. Reduce the humidity in your crawlspace and basement with dehumidifiers, sump pumps, or soil covers.
Maintain Your Lawn
Millipedes thrive in the moist layer of thatch that can accumulate on unkempt lawns. Keep your grass mowed short and dethatch the lawn as this will make it less appealing to millipedes. Try not to overwater your lawn. Don’t water your lawn at night as there is no sun to help evaporate the moisture.
Seal Them Out
Millipedes can enter your home through cracks in the exterior of your home or foundation. Seal any cracks or openings in the outside foundation. Use thresholds or door sweeps on all exterior doors. Caulk the outer edges of the thresholds. Seal any expansion joints where sunrooms, patios, and sidewalks are next to foundations. Seal any expansion joints or gaps at the bottom of basement walls.
Wait It Out
Millipedes can only survive for a few days once they get inside your home. The conditions indoors are too dry for them to be able to live long periods of time. The infestation will be short lived and eventually they will die off. Once this happens, you can sweep them up with a broom or vacuum them up.
Contact A Professional
While millipedes don’t cause damage to homes or to the health of humans, they can become quite a nuisance when they invade in large numbers. If you have a problem with millipedes or any other pests, contact a professional pest control company who can provide you with the most up-to-date prevention and treatment techniques.
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May 15, 2020 | Pest Control
Seeing “thousand legger”, creepy-crawly, slithering, worm-like pests in mass amounts inside your home? You’re not alone. They’re called millipedes and millipedes in houses are common at certain times during the year, particularly after heavy rains, during drought, or when temperatures drop – all conditions that can make their outdoor habitats less comfortable. Once millipedes are in the house, they’ll search for shelter and a source of moisture – preferring damp areas such as basements, laundry rooms, and crawlspaces.
Here’s everything you need to know about millipedes, what attracts them to your house, and how to prevent a millipede infestation:
What Do Millipedes Look Like?
Millipedes are arthropods, not insects, that typically have hundreds of legs (not thousands as their nickname implies). Their size depends on the species but they usually range from 1/4 to 2 inches long with slender, round bodies – similar to worms.
Are Millipedes Dangerous or Harmful?
Although creepy to some, millipedes are not dangerous or harmful to humans or pets. They don’t bite or sting, infest or damage wood, food or clothing – but they can release an unpleasant-smelling fluid if threatened that may cause skin irritation. If you come directly in contact with millipedes, rinse the affected area immediately after.
What Do Millipedes Eat?
Millipedes feed on dead and decaying matter – anything that’s rotting, dead insects, vegetable matter – which is vital in the decomposition of plants and animals, an important step in the soil fertilization process. They will occasionally eat young plants but the damage is usually minimal.
Where Do Millipedes Come From?
Millipedes prefer to be outdoors and can be found in areas with a lot of moisture – under rocks, piles of wood, flowerpots, in leaf litter or grass clippings, in gardens and flowerbeds, under mulch – any hiding spot that’s damp and undisturbed. You’re more likely to see them at night, when they leave their habitats, crawling around on sidewalks, driveways, patios, etc.
What Attracts Millipedes?
When weather conditions aren’t ideal outdoors, millipedes can migrate into structures in large numbers via doorways, expansion joints, and/or wall voids. Once inside, millipedes will die quickly, especially if there is no abundant source of moisture. If you’re seeing millipedes inside frequently, it may be a sign that they are breeding outside around your home, or that you have moisture issues that need to be corrected.
How to Get Rid of Millipedes
The best way to prevent a millipede infestation is to eliminate debris and decaying matter from around your home and yard – especially around your home’s perimeter, and correct moisture issues. Repair leaking pipes or faucets, check to be sure lawn sprinklers are functioning properly, consider upgrading your gutters with a gutter guard system, and ensure basements or crawlspaces are adequately ventilated. One of the most effective methods to reduce moisture and improve overall home health is to enclose your crawlspace.
If you’re seeing millipedes inside, a quick fix is to use a vacuum to get rid of them. If you’re experiencing a millipede infestation, it could be a sign of other issues, and it’s recommended to get your home inspected by a pest control company that can identify and correct entry points, check for and make suggestions related to moisture problems, and get you on a routine pest control service – to prevents future millipede and other pest infestations. Request a free estimate now or call (888) 466-7849.
Aug 23, 2019 | Pest Control
Millipedes are arthropods (not insects) that are commonly found in damp, moist locations. They feed on decaying organic matter. Millipedes will usually hide during the day and come out at night when the humidity is higher and dew is present on the ground. Millipedes are often mistaken for centipedes – they have elongated, worm-like bodies with 2 pairs of legs on each segment of their bodies. They are usually about 1 inch long with a hard, round, cylindrical body that is brown to black in color. When they are disturbed or dead they will curl into a spiral.
Finding a millipede in the house is not common. They cannot reproduce indoors and usually only come inside when there is a period of extreme wetness (during the rainy season) or in search of somewhere to overwinter (usually in late Fall). Millipedes are most commonly found in gardens but when they do come indoors they are usually found in the garage, basement, or the lowest level of the home. Millipedes that wander indoors typically die in a short amount of time because of the dryness.
If a millipede does get into your home, are they helpful or harmful? Should you be concerned? Millipedes are NOT harmful to humans. They do not feed on buildings, structures, or furnishings. They also cannot bite or sting. In fact, they can be beneficial in your compost pile as they help to break down the contents. They can cause damage to your garden by destroying seedlings or feeding on vegetables; however, there is no need to eliminate them unless they are causing damage to your plants.
While a millipede infestation is rare, there are things you can do to help prevent these pests from getting into your garden or home. Here are some tips on how to get rid of millipedes:
- Eliminate moisture in garden areas where millipedes are often found or where their eggs can overwinter.
- Rake out any old mulch under plants and replace it with either fresh mulch or straw.
- Put piles of raked leaves into the compost pile away from your home or bag them for disposal.
- Aerate your lawn to reduce thatch.
- Move anything that could provide a habitat for millipedes away from your home (compost piles, firewood, stones).
- Elevate any of these items that cannot be moved.
- Install a band of gravel between foundations and flower beds.
- Seal any cracks in the outside foundation.
- Seal around the bottoms of doors and basement windows.
- Use a dehumidifier to decrease the humidity in your home.
- Water lawns in the morning so they can dry out by afternoon.
- Contact a licensed pest control company who can inspect your home for entry points and help set up a comprehensive treatment and prevention plan.
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