- Cold and wet Melbourne winters push rats and mice out of garden burrows and outdoor shelters, straight into roof voids, subfloors and garages that stay warm and dry.
- A roof void near a ducted heating outlet is exactly what a rat is looking for in June — warm, undisturbed, and usually close to food.
- Scratching above the ceiling after dark is almost always rodents moving between their nest and a feed, not the house settling.
- A mouse can squeeze through a gap as small as 8 mm, so the gaps you have dismissed as too small are the ones worth sealing first.
- Baiting without sealing entry points and removing food sources clears the rats that are there now and leaves an open invitation for the next lot.
The first real cold snap hits, and a few nights later you hear it. A faint scratch above the bedroom ceiling. You decide the house is just settling. Then the dog’s biscuits start going down faster than they should, you find a scatter of dark droppings along the garage wall, and the scratching gets braver. By then it has stopped being your imagination.
Winter does not make rats and mice appear. What it does is change where they go. Cold and wet weather strips away the outdoor spots they were happy in through summer, and they start hunting for somewhere warm, dry and close to a feed. Your roof void happens to tick all three boxes. This page is about that seasonal shift and what to watch for. For year-round treatment, pricing and how a job is carried out, see our main Rodent Control Melbourne page. What follows is the winter side of the story.
Table of content
- Quick Answers About Winter Rodents in Melbourne
- Why Rodent Activity Increases in Winter
- What Technicians See After the First Cold Snap
- Why Rain Drives Rats and Mice Indoors
- Common Winter Entry Points
- Why Scratching Noises Increase in Roofs
- Signs Homeowners Should Look For
- Why Early Action Matters
- Winter Health and Property Risks
- What to Do Before Winter Rodents Settle In
- What to Do Tonight
- When to Call a Technician
- Technician Winter Inspection Checklist
- FAQs
Below are the questions Melbourne homeowners type in the moment they hear that noise, answered briefly, then the full picture underneath.
Quick Answers About Winter Rodents in Melbourne
Why do I hear scratching in my roof at night?
Rats and mice do most of their moving and feeding after dark, and a quiet house makes them easy to hear. That scratching is usually them running over insulation, gnawing, or pulling a nest together in the roof void. Get the roof space and entry points looked at before a couple of rodents turn into a colony.
Is it rats or possums in my roof?
Quick, light scratching and scurrying is rats or mice. Slow, heavy thumping that sounds like something walking is a possum. It matters which one you have, because possums are protected under the Wildlife Act 1975 and the law is strict about how they are handled, so an inspection sorts out the difference before anyone touches a trap.
How do I get rid of rats in the roof?
Seal the gaps they are using, take away whatever food and water is drawing them, then bait or trap inside the roof void and along the runs they travel. The sealing is the part that lasts. Skip it and a fresh lot of rats moves into the same warm roof within weeks of the first lot dying off.
Why do rats keep coming back after baiting?
Bait clears the rats that are there now. It does nothing about the hole they came through or the pet food bowl sitting out overnight. Leave both and you have built a vacancy other rats will fill. Real control means baiting and sealing and cleaning up the food source together, not one on its own.
What attracts rats and mice to Melbourne homes in winter?
Warmth, a dry nest and an easy meal. A roof void near ducted heating, pet food left down, an open bin, fruit dropping off the tree, a shed packed with clutter. Each one is a reason to choose your place. Take them away and the appeal drops fast.
How small a gap can a mouse fit through?
About the width of a pencil. Victoria Health puts it at a gap as small as 8 mm, so a hole you would swear is too small is still a doorway to a mouse. That is exactly why a proper seal-up checks every penetration rather than the obvious ones.
Why Rodent Activity Increases in Melbourne During Winter
Melbourne winters are cold and wet, and that combination is what pushes rodents toward the house. It is one of the two big pressure periods we see across the year, the late-summer mouse run and then the autumn-into-winter move indoors, and the winter one is when the activity lands inside the house rather than out in the garden. Bureau of Meteorology figures for Melbourne Airport put the average top temperature at 13.7 degrees in June, 13.2 in July and 14.6 in August, with rain on somewhere between 13 and 15 days each of those months. That is a lot of cold, damp nights.
A rat that spent summer under the woodpile or in a garden burrow does not enjoy that weather any more than you do. It wants warmth and a dry floor, and a Melbourne home offers both along with food. Roof voids near the heating outlets are the prize. Subfloors, garages, sheds, wall cavities and the dead space behind kitchen cupboards all get used as well.
The homes that cop it worst are the ones with a few small wall gaps, an unsealed pipe entry, a broken vent, or food sitting out in the open. Warm and easy to get into is the whole equation. The easier the way in, the quicker they settle and breed.
What Technicians Often See After the First Cold Snap
Rodent callouts tend to pick up once the temperature drops, and they climb again after a stretch of wet weather. The early signs are consistent enough that a technician knows roughly where to look before walking through the door. Roof voids, subfloors, garages and the outside perimeter get checked first, because that is where the trouble starts.
What shows up time and again is fresh droppings in the garage, laundry, pantry or roof, along with the scratching and scurrying people report after dark. There is usually gnawing on insulation, cardboard, food packaging or timber edges, and activity clustered around heating ducts, plumbing penetrations and wherever the roof can be accessed. Nests get built out of shredded paper, fabric and torn-up insulation. Outside, you can often follow worn rodent runs along the fence line, the garage wall and the edges of garden beds.
Victoria Health tells homeowners to watch for gnawing damage, holes, smear marks and droppings, and during winter callouts technicians find that early activity sitting right around rooflines, pipework, garage doors and roof voids. One sign on its own is rare. They travel in company.
Why Rain Drives Rats and Mice Indoors
Cold gets the blame for winter rodents, but rain does as much of the pushing. Melbourne sees rain on close to half the days through June, July and August, and a wet garden is a miserable place to be a rat.
Heavy rain floods burrows and soaks the garden shelter rodents rely on. The dry nesting spots go cold and unstable, and the food they normally forage gets harder to find. So they head up and in, to the roof spaces, wall cavities, garages and sheds that stay dry no matter how hard it comes down. That is why a run of rainy nights brings on callouts the same way a cold front does. If your rodent trouble started right after a week of rain, the two are connected.
Common Winter Entry Points Around Melbourne Homes
Rodents almost never chew their way in from scratch. They find the gap that has been there for years, the one you have walked past without a second look. When you do your own check, give the roofline the most attention, then anywhere a pipe, cable or service line passes through a wall.
The common ones are gaps around roof tiles and roof edges, broken or unscreened vents, and the openings left around pipes, cables and air-conditioning lines. Check near the hot water system, the bottom corners of the garage door, cracks in brickwork and render, and weep holes that have nothing protecting them. Subfloor vents with torn mesh, the gap under an external door, branches and creepers touching the roof, split weatherboards, damaged fascia, and any shed or storage area that never quite seals all do the job too. Roof rats are climbers, so do not overlook overhead routes either, the powerlines and pipes running to the house make a handy bridge straight to the roofline.
Do not write off a hole because it looks too small. Victoria Health notes a mouse gets through a gap as small as 8 mm, about the width of a pencil, so the small gaps matter just as much as the obvious ones when you are sealing up.
Why Scratching Noises Increase in Roofs During Winter
The ceiling scratching feels worse in winter for two reasons. More rodents have moved in, and the cold, quiet nights carry every little sound further than they would in summer.
Roof rats are strong climbers, and a roof void gives them protected nesting space, so they run across the joists and insulation as they move between the nest and a feed. Scratching that stays fixed in one spot usually means a nest is being built there. Sound that tracks across the ceiling is them following a regular path.
Working out what you are dealing with comes down to sound and signs. Rats are louder, with obvious scurrying, droppings and gnaw marks, and activity through the roof or walls. Mice are quieter, with light scratching, small droppings, action in the pantry and cupboards, and entry through tiny gaps. A possum is the heavy one, a slow thump that sounds like footsteps, almost always roof based, and a protected native animal that has to be handled a particular legal way. Guess wrong and you spend time and money on the wrong fix, which is the whole argument for an inspection.
Signs Homeowners Should Look For
Most people clock the noise first and only start noticing the rest once they go looking. Walk the house with this in mind.
Droppings are the clearest tell, turning up in cupboards, roof spaces, garages or under the sink. Beyond that, listen for scratching, squeaking or movement inside walls, ceilings and cupboards, and notice if pet food keeps disappearing overnight. Gnaw marks on packaging, timber, plastic, wiring or insulation are worth a look, as are burrow holes near walls, sheds, fences or garden beds. Greasy rub marks along walls and skirting, nests of shredded paper or cloth, and a stale, musky smell in closed-up spaces all point the same way. And keep an eye on the pets. A cat or dog that fixes on one patch of wall or ceiling has often worked it out before you have.
If you are hearing scratching at night or finding droppings in the garage, pantry or roof, book an pest inspection before you seal anything yourself. Seal too early and you trap the animals inside the roof or wall cavity, which turns a manageable job into a far worse one.
Why Early Action Matters Before a Small Problem Grows
A rodent problem rarely stays small, and the breeding maths is why. Victoria Health reports that roof rat females have four to five litters a year at six to eight pups each, and house mice manage six to ten litters a year. A small issue in June grows into a real infestation by August when the food, shelter and entry points are all still there.
The cost of waiting is more than the rats themselves. One or two visible signs usually mean more activity hidden in the roof and walls. Droppings and urine foul surfaces and stored food. Gnawing chews through insulation, packaging and electrical wiring. And the trap-only approach, which is where most people start, knocks down what you can see while leaving the gap and the food untouched. Clear the visible rats, leave the doorway open, and the roof fills back up. The fix has to deal with the whole situation, not the part you can hear.
Winter Health and Property Risks Linked to Rodents
Rodents are more than an annoyance. They contaminate food and surfaces, and their droppings, urine and nesting material need proper handling rather than a quick going-over with the dustpan.
Rats carry disease as well. Victoria Health notes that leptospirosis spreads through contact with water, soil, vegetation, food or surfaces fouled by the urine of infected animals, rats included, and it lists rodent control around the home as one way to bring that risk down. On the building side, the gnawing is what does the damage, working through insulation, packaging and electrical wiring and raising safety concerns inside roof and wall spaces. None of this calls for panic. It calls for sealing the food away, cleaning affected areas safely, and dealing with the rodents where they are getting in. For the full breakdown of rodent-borne disease risks and how treatment addresses them, see our main Rodent Control Melbourne page.
What Homeowners Should Do Before Winter Rodents Settle In
Prevention beats treatment, and most of it costs nothing but an afternoon. Seal the gaps around doors, pipes, vents and roof edges. Move pantry food into sealed containers and lift the pet food bowl overnight instead of leaving it down. Keep the bins shut and sitting away from the house. Clear the clutter out of the garage and shed so there is nothing for a rodent to nest under, and trim branches and plants back off the roofline. Fix the leaking taps, get rid of standing water, and keep the compost and bird seed under control so they are not a free buffet. Keep the roof void and subfloor well ventilated and the insulation in good order too, since damp, undisturbed roof spaces are exactly what a rat wants to nest in. After heavy rain, take a look in the roof space and subfloor.
That list lines up with what Victoria Health recommends, which comes down to removing the food, water and shelter, keeping things clean, clearing clutter, fixing leaks and filling the small gaps. Do most of it and a rat has little reason to pick your house over the one next door.
What to do tonight
If you suspect rodents right now and want to do something before bed, start with the food. Pick up the pet bowls, get the pantry items into sealed containers, and close the bins. Have a look under the sink and behind the fridge. Once the house goes quiet, listen for movement in the roof and walls, and if you find droppings or gnaw marks, take a photo for the technician rather than touching anything. If the noise carries on, that is your cue to book an inspection.
When to Call a Rodent Control Technician
Some of this is past the point of a trap from the hardware store. Make the call when the scratching keeps going for more than a night, when droppings turn up in more than one spot, or when you find chew marks on food packaging. Same goes if there is activity in the roof, walls or cupboards, if a pet keeps reacting to a hidden area, if burrows appear near the house, or if the traps you have set are not getting on top of it. With children, pets or food storage in the mix, or if you genuinely cannot tell whether you are listening to rats, mice or a possum, it is worth bringing someone in.
Better Health Channel says to use a licensed pest control operator once a problem gets too hard to manage on your own. In Victoria that operator should hold a Pest Control Licence issued by the Department of Health, and you are well within your rights to ask to see it. Every technician at Tom’s Pest Control Melbourne is licensed, and we will tell you what we are using and why, with straight advice on keeping kids and pets clear of any baiting.
If you have heard scratching in the roof, found droppings, or spotted gnaw marks around the place this winter, book a rodent inspection through our Rodent Control Melbourne page. We will find the entry points, the nesting areas and the food sources, then put a plan together to clear them out and keep them out.
Technician winter inspection checklist
When we inspect a Melbourne home in winter, these are the points we work through: the roof void, garage door gaps, pipe and cable penetrations, subfloor vents, weep holes, bins and pet food storage, garden beds and fence lines, overhanging branches, and any sheds or storage areas.
Frequently Asked Questions
Why are rodents worse in Melbourne during winter?
Cold, wet weather pushes rats and mice toward warm, dry shelter, and Melbourne homes hand them roof voids, garages, sheds, wall cavities and easy food. Winter does not create rodents. It moves them indoors.
Why do I hear scratching in my roof at night?
Rats and mice feed and move after dark, and a quiet house makes the running, gnawing and nest building easy to hear. Get the roof void and entry points inspected to confirm what is up there.
Does rain make rats and mice come inside?
Yes. Heavy rain floods outdoor burrows and soaks garden shelter, so rodents move to dry spaces like roof voids, garages and subfloors. Activity often rises straight after a wet stretch.
What are the first signs of a rodent problem?
Droppings, night-time scratching, missing pet food, gnaw marks, burrow holes, greasy rub marks and a pet fixating on one spot are the usual early clues.
Where do rats get into homes in winter?
Through roof gaps, broken vents, openings around pipes and cables, garage door corners, weep holes, wall cracks, subfloor vents and gaps under external doors.
Are roof rats common in Melbourne homes?
Yes. Roof rats are one of Victoria’s common pest rodents and strong climbers, and they favour roof voids and wall cavities for nesting.
How small a gap does a mouse need to get inside?
Victoria Health says a mouse can squeeze through a gap as small as 8 mm, about the width of a pencil, so even openings that look far too small are worth sealing.
Should I use DIY traps or call a technician?
Traps cut down the rodents you can see, but they do not seal entry points or remove food sources, so the problem comes back. Call a technician when the noises continue, droppings spread, or the source stays hidden.
Are rodent droppings dangerous?
Droppings and urine contaminate food and surfaces and need careful handling. Avoid direct contact, clean affected areas safely, and deal with the rodents at the source.
How do I stop rodents coming back after treatment?
Seal the entry points, remove food and water, clear clutter, trim vegetation, secure the bins and check the roof and subfloor after winter rain. Treatment without sealing only buys time.