Millipedes in Tennessee | Pest ID Guide
Quick Facts About Millipedes
Millipedes are slow-moving, worm-like creatures that live outdoors in damp leaf litter and mulch. A few times a year, especially in fall and after heavy rain, they migrate in large numbers, and many end up in Tennessee garages, basements, and crawl spaces.- Size: Usually about 1 to 1 1/2 inches, though some native species are larger
- Body: Round and segmented, with two pairs of legs per segment
- Color: Dark brown to black, sometimes with red, orange, or yellow markings
- Behavior: Curl into a tight coil when disturbed
- Diet: Decaying leaves, wood, and plant material
- Indoors: Usually die within a few days, because indoor air is too dry
How to Identify Millipedes
A round body, many short legs, and slow movement set millipedes apart from centipedes, which are flattened, long-legged, and fast.See our centipede guide.
Why Millipedes Come Inside
Millipedes need moisture. Heavy rain floods their habitat, and dry spells drive them to search for damp places, so they often migrate in large numbers in fall and after big storms. Thick mulch, leaf litter, and poor drainage along the foundation put large populations right next to your doors.
Are Millipedes Harmful?
No. Millipedes don’t bite or sting, and they don’t damage structures or food. Some release a defensive fluid when handled that can irritate or temporarily stain skin, so wash your hands if you touch one. The main problem is the numbers.
Where Millipedes Gather
- Garages and basements, especially near doors
- Crawl spaces
- Patios, sidewalks, and foundation walls after rain
- Under mulch, leaf litter, stones, and landscape timbers
How to Keep Millipedes Out
- Reduce mulch and leaf litter: Keep a strip of bare ground or gravel next to the foundation.
- Fix drainage: Clean gutters and extend downspouts away from the house.
- Seal gaps: Add door sweeps, especially on garage doors, and caulk foundation cracks.
- Dry out damp areas: Crawl space moisture attracts millipedes; see crawl space encapsulation.
- Vacuum indoors: Sweep or vacuum up millipedes that get inside.
During heavy migrations, a professional perimeter treatment helps stop them before they get in. See our quarterly pest control.
Frequently Asked Questions
Why are there so many millipedes in my garage?
Millipedes migrate in large numbers in fall and after heavy rain, looking for damp places, and garages are easy to get into.
Are millipedes harmful?
No. They don’t bite, sting, or damage anything, though some release a fluid that can irritate skin.
How do I keep millipedes out?
Reduce mulch and leaf litter near the foundation, improve drainage, add door sweeps, and seal cracks.
Why do millipedes die in my house?
Indoor air is usually too dry for them, so they die within a few days.
What’s the difference between a millipede and a centipede?
Millipedes are round, slow, and have two pairs of legs per segment. Centipedes are flattened, fast, and have one pair per segment.
