Name: Jim's Pest Control
Address: 48 Edinburgh Rd, Mooroolbark, VIC, 3138, AU
Telephone: 131 546
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48 Edinburgh Rd, Mooroolbark 3138, VIC

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Here's the short answer: millipedes invade homes ahead of wet season because heavy rain floods their usual habitat in soil, mulch and leaf litter, forcing large numbers to migrate to drier, higher ground - and your home's foundation is often the nearest option. The most effective way to stop them is sealing entry points, clearing damp mulch and vegetation away from the foundation, and treating the perimeter before the rain starts, not after they're already inside. This is one of the most seasonal, predictable calls our technicians at Jim's Termite & Pest Control get every year, so I'll explain exactly why this happens and what actually works to keep them out before the wet weather hits.

TL;DR — Key Takeaways

Millipedes migrate indoors when their habitat floods heavy or sustained rain pushes them out of soil, mulch and leaf litter in search of dry ground.
They don't bite or sting, but a mass migration of hundreds or thousands at once is a genuine nuisance and can be difficult to clean up.
Prevention works far better than reaction once they're inside, you're dealing with the aftermath rather than the cause.
Sealing entry points and clearing mulch/debris from the foundation are the two most effective DIY steps before wet season arrives.
A perimeter treatment applied ahead of the wet season creates a barrier that stops migration before it starts, rather than dealing with an active swarm.
If millipedes are a recurring problem at your property each year, get a free quote for a pre-wet-season perimeter treatment rather than waiting for the next swarm.

Why Do Millipedes Suddenly Swarm My Home?

Millipedes swarm in large numbers when sustained or heavy rain saturates the soil, mulch and leaf litter they normally live in, forcing them to migrate to find drier ground and a house foundation is often the first dry, elevated surface they reach.

This is different from most household pests, which trickle in gradually. Millipede migrations tend to happen:

All at once, often overnight, after several days of heavy rain
In very large numbers hundreds or even thousands can appear along a single foundation wall
Repeatedly each year, particularly in properties backing onto gardens, bushland or heavily mulched garden beds

If this happens at your property every wet season, it's a strong sign there's a large, established millipede population living in the garden beds or leaf litter close to your home and it will keep happening annually unless the conditions are changed.

Are Millipedes Actually Dangerous?

No, millipedes don't bite, sting, or spread disease, but some Australian species can secrete a defensive fluid that irritates skin or eyes if handled, so it's still worth avoiding direct contact, especially for kids and pets.

The real issue with millipedes is less about danger and more about:

Sheer numbers — a swarm of thousands is genuinely distressing to deal with, even though each individual is harmless
Odour — large numbers of dead or dying millipedes can produce an unpleasant smell as they decompose
Persistent presence — they'll keep entering through the same gaps for days or weeks during peak wet weather if entry points aren't sealed

How Do I Stop Millipedes Getting Into My Home Before Wet Season?

The most effective approach combines sealing physical entry points, removing the damp conditions that attract them near your foundation, and applying a perimeter treatment before the rain starts.

1. Seal gaps around your foundation and doors Millipedes only need a few millimetres to get through. Check and seal:

Gaps under external doors
Weep holes (these should have vent covers, not be fully sealed)
Cracks in the foundation, slab edges and where pipes enter the wall
Gaps around window frames at ground level

2. Clear mulch, leaf litter and dense vegetation away from the foundation Millipedes live and breed in exactly this material. Pull mulch and garden beds back at least 20-30cm from the house, and keep leaf litter from building up against exterior walls.

3. Fix drainage issues near the house If water pools against your foundation during rain, that area becomes prime millipede habitat right where you don't want it. Redirect downpipes and improve drainage so water moves away from the house rather than sitting against it.

4. Reduce excess moisture around entry points Fix any leaking outdoor taps, air conditioning units or irrigation lines that keep soil consistently damp near the foundation.

5. Apply a perimeter treatment ahead of wet season This is the step most homeowners skip, and it's the one that makes the biggest difference. A residual treatment applied around the foundation before heavy rain arrives creates a barrier that stops migrating millipedes before they reach your doors and windows rather than treating an active swarm after the fact.

What Should I Do If Millipedes Are Already Inside?

If millipedes have already made it inside, sweep or vacuum them up rather than crushing them (crushed millipedes can stain surfaces and release odour), then focus on sealing the entry point they used before the next heavy rain.

A few practical notes:

Vacuuming is more effective and less messy than sweeping for larger numbers
Don't rely on sprays alone once they're inside treating the entry point and the source area outside matters more than spot-treating individuals indoors
Check for the entry point immediately while it's still obvious, since gaps used once are usually used again in the next migration event

Why Does This Keep Happening Every Year at My Property?

If millipede swarms are an annual event, it almost always means there's an established breeding population close to the house usually in thick mulch, a damp garden bed, or leaf litter that never gets fully cleared and the same entry points are being used every wet season.

This is exactly the kind of recurring, seasonal pattern that's worth addressing properly rather than dealing with reactively each year. A proper inspection from our team at Jim's identifies exactly where the population is established and where they're getting in, so the perimeter treatment actually targets the source rather than just knocking down whatever's visible on the day.

Get Ahead of This Year's Wet Season

If millipedes swarm your property every year around the same time, waiting until it happens again means dealing with the same mess, the same odour and the same cleanup. A pre-wet-season perimeter treatment breaks that cycle before it starts.

Learn more about Jim's millipede pest control service, or get a free quote online and we'll get a treatment plan in place before the rain hits. If moisture and subfloor conditions are a recurring issue at your property, our guide to termite inspections in Australia covers a lot of the same damp-prone risk factors worth checking while you're at it, and our piece on why Sydney's Inner-West keeps getting pests digs further into how local climate and drainage drive these seasonal swarms.

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