BehaviourLow risk
Where Do Cockroaches Hide?
Quick answer
Cockroaches hide in tight, dark, warm and humid gaps close to food and water. Indoors that means behind and under fridges, dishwashers and ovens, inside cupboard hinges, under sinks, behind kickboards and in wall voids. Outdoors they shelter in drains, sub-floors, roof voids, mulch, compost and palm fronds.
Why this happens
Cockroaches are thigmotactic: they prefer spaces where their bodies touch surfaces above and below. A gap just a few millimetres wide is ideal for a German cockroach.
Heat from appliance motors, humidity from plumbing, and nearby food make kitchens and bathrooms the most common indoor hiding areas.
What you may be seeing
- Droppings and smear marks concentrated around hinges, corners and appliance edges.
- Egg cases tucked into crevices.
- A musty odour in cupboards with heavy activity.
What you can do
- Inspect with a torch: fridge and dishwasher surrounds, under the sink, cupboard hinges, behind kickboards, around the hot water system and laundry tubs.
- Remove clutter and cardboard that creates extra hiding places.
- Seal cracks and crevices with sealant where appropriate.
- Place monitoring traps in suspected areas to confirm activity.
When professional help may be needed
Professionals use detailed inspection to find harbourages, which is the key to targeted treatment. If you cannot find where they are living but keep seeing them, an inspection can help.
Related pest
Species mentioned
German Cockroach
Blattella germanica
A small, light-brown cockroach that lives and breeds indoors, mostly in kitchens and bathrooms. It reproduces faster than any other household cockroach and is the species most often behind persistent indoor infestations.
American Cockroach
Periplaneta americana
One of the largest household cockroaches in Australia. Lives in drains, sewers and sub-floors and wanders inside on warm nights.
Smokybrown Cockroach
Periplaneta fuliginosa
A large, uniformly dark mahogany-brown cockroach that lives in trees, roof voids and gutters and is a strong flyer attracted to lights.
Related questions
Related guides
The Australian Guide to Cockroaches
Everything an Australian household needs to know about cockroaches: which species you are seeing, why they are there, how they get in, the health implications, and how to prevent and manage them.
GuidePest Prevention Checklist
A printable seasonal checklist of simple, low-cost tasks that reduce pests around Australian homes, with the reason behind each step and extra lists for renters, apartment residents, pet owners and Queenslander owners.
GuideHow to Pest-Proof Your Home
A practical, room-by-room approach to reducing pests without relying on chemicals: remove what attracts them, close the ways in, and make your property less comfortable for them.
Local information
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Sources & further reading
- Australian Museum — insects and spiders — Australian Museum
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