Melbourne Pest Season Calendar — What’s Active Each Month
Melbourne’s pest calendar does not follow the rest of Australia. Our cooler, wetter climate pushes most insect activity later and shorter than Sydney or Brisbane, and the north-west growth corridor — Craigieburn, Roxburgh Park, Mickleham, Epping, Broadmeadows — runs a touch hotter and drier than the inner suburbs, so wasps and ants peak earlier out here.
Below is a month-by-month guide to what is actually active in Melbourne homes and businesses, what to look for, and when treatment is worth it. “Active” means the pest is breeding, foraging or entering buildings — which is not the same as “you should spray”. Most pests are best treated at a specific point in their cycle, not whenever you notice one.
January — Ants and cockroaches at full tilt
Hot, dry, post-holiday. Ants are the number one call-out — colonies send out long foraging trails as natural food dries up and they come indoors. German cockroaches breed fastest in the heat, so a kitchen that looks clean can still carry them behind the dishwasher. Flies peak around bins and outdoor entertaining. Wasps are at season peak and aggressive.
Worth doing: Ant treatment before trails establish; kitchen cockroach treatment if you have seen one at night.
February — Wasps, flies, and the first spiders
European wasps peak and are at their most aggressive — by late February nests are at maximum size. Spiders start moving in as females seek egg-laying sites: redbacks in the shed and letterbox, black house spiders in window frames. Mosquitoes build up while the weather stays warm and humid.
Worth doing: Wasp nest removal (professionally — never DIY); spider treatment around external entry points.
March — Rodents start their move indoors
The temperature drops and rats and mice begin looking for warmth and food. This is the critical month — act now and you are managing a problem; wait until July and you are managing an infestation. Cockroaches are still active and termites are still foraging.
Worth doing: Rodent baiting and proofing; termite inspection while the soil is still warm.
April — Autumn rain brings ants back and cockroaches in
Autumn rain and cooler nights push ants to nest deeper and send them inside for shelter. Cockroaches move indoors looking for warmth — this is when a spotless kitchen starts seeing them.
Worth doing: External perimeter treatment; cockroach gel in kitchens and bathrooms.
May — Mice, rats and the start of the winter problem
Rodent call-outs climb sharply. Mice are the most common — they fit through a 7 mm gap, so a house that held nothing all year suddenly has scratching in the ceiling. Termites remain active in Melbourne’s soil through winter.
Worth doing: Rodent inspection and proofing; roof void check.
June — Winter: cockroaches, rodents and the roof void
The quietest month outdoors, the busiest indoors. Rats and mice are established and breeding. German cockroaches thrive in heated kitchens. Silverfish appear in wardrobes and stored boxes. Termites keep foraging — they do not stop for winter here.
Worth doing: Rodent baiting program; cockroach treatment; termite barrier check if due.
July — Same as June, plus ants in the kitchen
Coldest month. Rodents at peak indoor activity. Ants — especially coastal brown and black house ants — nest inside wall cavities and skirting.
Worth doing: Ant nest treatment (surface spray will not reach a cavity nest); rodent follow-up.
August — Termite swarming risk begins
Melbourne’s termite swarm season can start in August in a warm year and run through to November. Swarmers are winged, drop their wings, and are often mistaken for flying ants — the difference matters enormously.
Worth doing: Termite inspection — this is THE month. If you only do one inspection a year, do it now.
September — Spring is termite season
Peak termite swarming and foraging. Ants ramp up. Spiders return — redbacks in garden sheds, letterboxes and piled firewood. Bees start swarming and can take up a wall cavity in a day.
Worth doing: Termite inspection and barrier; spider treatment; bee removal (professionally).
October — Wasps build, spiders settle
European wasp nests are growing fast. Spiders at peak around external structures and garden furniture. Cockroaches and ants active as the weather warms. Flies return with the heat.
Worth doing: Spider treatment; monitor wasp activity before nests get large.
November — Termites, wasps and the summer build-up
Termites still foraging. Wasps now at serious numbers. Ants in gardens and paths. Mosquitoes building near water features.
Worth doing: Wasp nest removal early — cheaper and safer than December; termite barrier.
December — The summer surge
Ants dominant. Cockroaches breeding rapidly. Flies everywhere. Wasps at peak and dangerous. Mosquitoes at their worst around dusk.
Worth doing: Ant treatment; kitchen cockroach treatment; wasp nest removal.
The three Melbourne specifics worth knowing
1. Termites here do not take winter off
Melbourne’s soil stays warm enough that termites forage year-round — unlike colder climates where winter is a genuine break. If you are timing an inspection around “termite season”, you are working from advice written for Queensland. See our termite treatment and inspections.
2. Wasp nests peak in late summer, not spring
European wasp numbers are highest from February to April. By the time the nest is obvious it is at maximum size and maximum danger. Treating early, from October to December, is materially safer — but never attempt a nest yourself. See bee and wasp removal.
3. Rodents move in around March, not winter
By the time you hear scratching in July, the colony has been established for four months. March is the month that actually matters. See rodent control.
Frequently asked questions
When is termite season in Melbourne?
Swarming typically runs from August to November, with the core in September and October. But Melbourne termites forage year-round, so an annual inspection is worthwhile in any month — there is no true off-season here.
What is the worst month for pests in Melbourne?
January and February for ants, cockroaches and wasps; June and July for rodents indoors. March is the single most important month for prevention.
Do I need an annual pest treatment in Melbourne?
Residential pest treatment is generally recommended annually. Termite management is separate and depends on whether you have a chemical barrier, typically re-treated every five to eight years, or baiting stations that are monitored continuously.
Are European wasps dangerous?
Yes. They sting repeatedly, unlike bees, and are aggressive around food and nests. Never treat a wasp nest yourself — a single nest can hold thousands of wasps.
How do I tell a flying ant from a termite swarmer?
Termites have straight antennae, a thick waist and four wings of equal length. Flying ants have bent antennae, a pinched waist and front wings longer than the back wings.
Which pests are most common in Craigieburn and Melbourne’s north?
Ants and spiders are the most frequent call-outs through spring and summer, rodents from autumn, and termites year-round. The north-west corridor runs hotter and drier than the inner suburbs, so wasp and ant activity starts earlier.
Not sure what you are dealing with?
Call 0422 805 251 — we will tell you what it is, whether it needs treating now, and what it will cost. Licensed technicians (VIC Licence L010632), servicing Craigieburn and Melbourne’s north and west.
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