Why Rain Makes Millipedes More Noticeable
Millipedes live outdoors in damp soil, decaying plant matter, and other organic material. Mulch, leaf litter, ground cover, and rotting wood give them moisture, shelter, and food while keeping them hidden during the day.
When several days of rain saturate those areas, large numbers may leave their usual hiding places at once. Millipedes need moisture, but they cannot remain in flooded soil. As water fills the air spaces in the soil and soaks their shelter, they crawl to the surface and seek higher ground.
That is why you may suddenly find several curled up on the garage floor or near a patio door. It does not usually mean they are breeding inside. Hot, dry weather can also prompt millipedes to move in search of moisture, but after a stretch of summer storms, a saturated outdoor habitat is the more likely explanation.
Millipedes are nuisance pests rather than wood-destroying pests. They do not bite, sting, or damage the structure of your home, and most cannot survive for long in normal, dry living spaces. Some species can release a defensive fluid that may irritate skin or eyes, so it is better to sweep or vacuum them up than crush or handle them.
How Millipedes Get Inside
Millipedes do not chew openings or damage homes to get inside. Instead, these centipede cousins use gaps that already exist, especially where the foundation sits close to damp landscaping.
Common entry points include:
- Worn weather stripping or gaps under garage and exterior doors
- Cracks and expansion joints where the garage slab meets the foundation
- Openings around plumbing, electrical lines, and AC components
- Sliding-door tracks and other low exterior thresholds
- Weep holes in brick walls
Weep holes are part of the wall’s drainage system and should not be caulked closed. A pest control professional can determine whether an appropriate pest guard or another form of exclusion makes sense.
What Keeps Millipedes Close to the House
A single weather event can produce a brief increase in millipede activity. Certain conditions around a property, however, can keep larger populations close enough to the foundation that more of them find their way indoors.
Common contributors include:
- Thick mulch or leaf litter touching the house
- Irrigation running often enough that landscape beds never dry
- Downspouts or drainage that leave water near the slab
- Dense ground cover beside exterior walls
- Firewood, planters, or stored materials resting against the house
- Damaged door seals and unsealed exterior gaps
Pulling mulch away from the foundation can help by creating a clearer, drier strip beside the house. It may not solve the problem by itself if irrigation, drainage, leaf litter, or another moisture source remains.
The same damp habitat can also support centipedes, earwigs, and other insects. That does not mean all moisture-loving pests are inside your home. It does mean that reducing moisture and shelter near the foundation can help make the area less inviting to several common household insects.
What You Can Do Around Your Home
For a small, short-lived wave of millipedes, start with the conditions around the house:
- Sweep or vacuum up millipedes found indoors.
- Replace worn door sweeps and garage-door seals.
- Seal appropriate cracks and openings around exterior penetrations.
- Let landscape beds dry between watering when plants permit.
- Correct leaking faucets, clogged gutters, and drainage that leaves standing water.
- Remove leaf litter and move firewood or stored materials away from the foundation.
- Thin dense ground cover where it prevents the soil from drying.
A store-bought spray may kill the millipedes it contacts, but it will not correct the outdoor conditions or close the routes pests are using. Moisture control and exclusion can help, while ongoing pest control provides broader protection against common household pests active year-round.
Ongoing Protection From Millipedes and Other Household Pests
Millipedes are included in Marathon Pest Control’s Basic Pest Control Plan, along with common household pests such as ants, cockroaches, spiders, earwigs, crickets, and silverfish.
The initial service begins with an inspection, followed by treatment to address millipedes or other pests covered by the service currently active in and around the home. After that, quarterly exterior treatments help prevent future pest problems as the weather and seasonal activity change. Interior treatment is also available when needed or requested.
If a covered pest shows up between scheduled visits, Marathon will return and re-treat at no additional charge under the Pest-Free Guarantee. Homeowners receive year-round protection without having to start over with a new service call every time a different pest appears.
Protect Your Home Throughout the Year
Local, family-owned Marathon Pest Control has provided ongoing residential pest control in The Woodlands, Magnolia, Conroe, and surrounding communities since 2016.
Request a free quote to address the pests currently active around your home and keep future pest problems from gaining a foothold.
