Florida is home to dozens of millipede species, and the ones you’re most likely to encounter are the bumblebee millipede, the rusty millipede, and the Florida ivory millipede. Two of those three are invasive, and all three are harmless. Whether you’ve spotted one crawling across your patio or found dozens inside your house after a rainstorm, here’s what you’re dealing with.
The Three Most Common Species
The bumblebee millipede is the one most Floridians notice first. It’s named for its alternating black and yellow bands, which make it easy to identify. Native to the Caribbean, it was introduced to southern Florida and has established itself across the region, sometimes appearing in large numbers. Despite those numbers, it’s not considered a pest. Adults reach about 2 to 3 inches long and are often spotted near porch lights at night or under leaf litter during the day.
The rusty millipede is the other common invasive species. It’s smaller and has a reddish-brown or coral-colored body. Like the bumblebee millipede, it arrived from tropical regions and thrives in Florida’s warm, humid climate. You’ll find it in gardens, mulch beds, and compost piles.
The Florida ivory millipede is the native of the group. It’s the largest of the three, sometimes reaching 3 to 4 inches, with a smooth, dark body that can appear almost black with lighter leg coloring. It’s found throughout the state and is a common sight in wooded areas and residential yards alike.
Why They Show Up Inside Your Home
Millipedes breathe through tiny openings along their body, and they need moisture to survive. That dependency on moisture is exactly what drives them indoors. When soil becomes waterlogged after heavy Florida rains, millipedes can’t breathe properly underground. They migrate to the surface and higher ground, where they end up on concrete slabs, foundations, and siding. From there, it’s a short trip through a door gap or crack in the wall.
The opposite extreme triggers migration too. During hot, dry stretches, millipedes move in search of moisture and can end up inside for the same reason: they’re following whatever path leads to more hospitable conditions. Florida’s weather pattern of intense summer rain followed by dry spells creates a cycle where millipede invasions can happen multiple times a year. Fall can bring another wave as millipedes search for sheltered spots to ride out cooler temperatures.
A few millipedes wandering in is normal. Dozens or hundreds at once usually means the soil conditions around your home changed rapidly, either from a downpour or a prolonged dry spell.
Are They Harmful?
Millipedes don’t bite, sting, or spread disease. They can’t damage your home’s structure, and they don’t eat your food or fabrics. Some species, including the bumblebee millipede, can secrete a mild defensive fluid when handled or crushed. This liquid can irritate skin and will stain surfaces a yellowish-brown. It’s worth washing your hands after handling one, but the reaction is mild for most people.
Once inside, millipedes typically die within a day or two because indoor air is too dry for them. They don’t reproduce indoors. The problem is purely a nuisance, not a health or structural concern.
Keeping Millipedes Out
The most effective approach is managing moisture and entry points around your home’s perimeter. Millipedes follow moisture gradients, so the goal is to make the area immediately around your foundation less appealing to them.
- Reduce ground moisture near walls. Pull mulch, leaf litter, and compost at least 6 to 12 inches away from your foundation. These materials hold moisture and create the exact habitat millipedes seek. If you use landscape fabric or stone instead, the area dries faster and becomes less attractive.
- Fix drainage issues. Downspouts should direct water well away from the foundation. Low spots in the yard that pool water near the house are a magnet for millipedes during the rainy season.
- Seal entry points. Gaps under doors, cracks in the foundation, and spaces around utility lines are the main routes inside. Door sweeps and caulk handle most of these.
- Reduce outdoor lighting near doors. Millipedes are attracted to light at night. Switching to yellow or sodium vapor bulbs, or moving lights away from doorways, can reduce the number congregating near entry points.
If you find millipedes inside, a vacuum is the simplest solution. Sweeping them up and disposing of them is all that’s needed. They won’t establish a colony indoors, so once the weather event that drove them in passes, the influx stops on its own. For yards with persistent large populations, reducing organic debris like thatch, fallen leaves, and rotting wood removes their food source and shelter, gradually lowering numbers over time.
Millipedes vs. Centipedes
These two get confused constantly, but they’re very different animals. Millipedes have two pairs of legs per body segment, move slowly, and curl into a coil when disturbed. They eat decaying plant material. Centipedes have one pair of legs per segment, move fast, and are predators that eat insects. Florida’s centipedes can bite, though it’s rare and comparable to a bee sting. If the creature you found was slow, round-bodied, and curled up when you touched it, it’s a millipede.