If millipedes are suddenly all over your porch, garage and baseboards after a fall rain, the problem is not inside your house. It is outside, in the mulch and leaf litter along your foundation. Good millipede control NWA homeowners can count on starts in the flower bed, not the living room. In fact, the ones you find indoors are already on their way out, because they dry up and die in a matter of days.
Why Are There So Many Millipedes in My House After It Rains?
Millipedes live in damp, shaded places and feed on decaying organic matter. The University of Arkansas millipede handout for homeowners lists leaves, mulch and piles of wood chips as their favorite spots. Northwest Arkansas has plenty of all three. Our oak and hickory hillsides drop a thick layer of leaves every fall, and most yards hold a deep bed of mulch right against the house.
Two things send them moving. First, fall itself triggers it. The same handout says millipedes migrate away from their feeding areas in the fall and invade homes. Second, heavy rain pushes them up. According to NC State Extension’s guide to millipedes around homes, water-saturated soil forces them to the surface. So a soaking October rain after a dry spell can put large numbers of them on the march at once.
Once they start walking, your foundation is simply in the way. They climb the wall, find a gap under a door and end up on your floor. That is why you see millipedes in the garage and along the lower level first.
The Good News About Millipedes in Northwest Arkansas
Here is the part most people do not expect. Millipedes cannot live in your house. NC State notes that they rarely survive indoors more than a few days, and often only a few hours. They need constant moisture, and heated indoor air does not provide it. As a result, the curled, dried millipedes you sweep up each morning are the end of the line.
They are also harmless. University of Arkansas Extension states that the kinds found in Arkansas neither bite nor sting. Some species do release a fluid that smells bad and can irritate skin. Therefore, a broom or a vacuum beats a bare hand. However, they will not damage your home, your pantry or your furniture.
Why Spraying Indoors Does Not Fix It
Because the millipedes inside are already dying, an indoor spray treats the wrong end of the problem. NC State says insecticide along baseboards does not really stop a millipede invasion. Meanwhile, the source keeps producing more of them a few feet from your door. This fits how we approach millipede control NWA wide, and nearly every other pest too. Almost all of them come from outside, so the outside is where the work belongs.
Millipede Control NWA Homeowners Can Do Themselves
Most millipede control NWA yards need takes no product at all. The goal is a dry, clean strip of ground around the house.
First, pull mulch and dead leaves back from the foundation. University of Arkansas Extension recommends removing mulch and dead vegetation next to the house. Next, clear away boards, rocks and stacked items that hold moisture against the wall. Then look at your lawn. Extension also notes that dethatching and mowing closely let the ground dry out. Finally, water in the morning instead of the evening so the soil dries by nightfall.
Entry points matter too. Check door thresholds first, especially sliding glass doors and the garage door. NC State lists those, along with expansion joints, as common ways in. Additionally, a worn door sweep is an open gate for anything that crawls. Replace it, caulk the cracks you find and make sure windows fit tightly.
Basements and Crawlspaces Need Extra Attention
Hillside homes in Bella Vista, Fayetteville and around Beaver Lake often have walkout basements. Those lower levels stay cooler and damper than the rest of the house. The University of Arkansas handout warns that millipedes survive longer in moist basements. So keeping that level dry helps. Similarly, a damp crawlspace keeps them alive under the floor. We wrote about foundation vents and crawlspace moisture in Northwest Arkansas if that sounds like your house.
When Professional Millipede Control NWA Service Makes Sense
Sometimes the numbers are simply too big for a rake and a caulk gun. New neighborhoods in Bentonville, Centerton and Lowell often back up to woods or pasture. Lots like that give millipedes plenty of habitat right next to the house.
In that case, millipede control NWA homes benefit from most is an exterior barrier treatment. University of Arkansas Extension describes treating the lower foundation wall and a band of soil around the house. We apply that barrier, and we also treat door sills and other entry points. This is the same exterior focus behind our quarterly residential pest control service. It also covers other fall invaders, such as the pests on our earwig control page and the Asian lady beetles that gather on Arkansas homes each autumn.
Common Questions About Millipedes in NWA
Are millipedes harmful to people or pets?
No. Arkansas millipedes do not bite or sting. Some give off a smelly fluid that can irritate skin, so sweep or vacuum them instead of picking them up.
How long do millipedes live inside a house?
Usually a few days at most. They dry out quickly in indoor air. However, they can last longer in a damp basement or crawlspace.
Why do I only see millipedes in the garage and basement?
Millipedes travel at ground level. Therefore, they reach garage doors, thresholds and lower floors first. Most never make it any farther.
Will the millipedes come back next year?
They can, because the cause is the habitat outside. If the mulch stays deep and damp against the foundation, the next wet fall will likely bring another wave. So fix the perimeter and you fix most of the problem.
Get Help From a Local Team
Extermco has handled fall pests since 1991. Our Springdale office on Elm Springs Road covers Benton and Washington counties. We serve Springdale, Rogers, Fayetteville and the towns in between. If you want millipede control NWA neighbors already trust, send us a note through our contact page or call (479) 783-1822, and we will take a look at the outside of your home first.
