Homeowners across Sydney woke up to a surprise this spring: moths. Lots of them. Balconies, windows, front porches and street lights all covered in dark, dusty wings. Social media quickly filled with videos of swarms clustering around homes from the Hawkesbury to the North Shore and down through the Sutherland Shire.
Before you reach for the bug spray, here's what's actually going on, and why the best thing you can do is leave them alone.
What are bogong moths?
Bogong moths (Agrotis infusa) are a native Australian moth species found throughout south-eastern Australia. They measure between 2.5 and 3.5 centimetres in length and are easy to recognise: dark brown to grey in colour, with a distinctive dark stripe running down each wing and small spots flanking the stripe on both sides.
They are not a pest in the traditional sense. They don't eat your food, damage clothing, or breed inside your home. They are migratory insects on a long seasonal journey.
Why are they swarming Sydney right now?
Every spring, bogong moths travel thousands of kilometres south from Queensland and central NSW toward the alpine regions of NSW and Victoria. The cooler mountain air provides relief from the summer heat and a safe place to aestivate (the warm-weather equivalent of hibernation) until autumn.
Their route isn't fixed. Wind patterns and weather conditions play a significant role in exactly where the moths travel, which is why some years see large numbers passing through coastal areas like Sydney. In September 2026, conditions have pushed high numbers toward the coast, producing the dramatic swarms now visible across the Hawkesbury, North Shore, Eastern Suburbs and Sutherland Shire.
"Before anyone reports a moth-related crime spree, please be reassured that these little travellers are a natural part of Australia's migration cycle. While they may seem to have launched a coordinated takeover of the Hawkesbury this week, they are simply passing through on their annual journey."
Source: Nine.com.au, 27 September 2026
The moths don't choose your balcony. They are drawn to light sources, which causes them to congregate near homes and street lamps along their route. Once the right weather conditions return, they move on.
Are bogong moths dangerous?
No. Bogong moths are completely harmless to humans. They do not bite, do not sting, and carry no disease. They have no interest in your food stores, fabric, or timber, unlike clothes moths or pantry moths, which are separate species entirely.
The worst they'll do is cluster on your walls, flutter around your lamps, and leave a fine dust (wing scales) behind when they depart. Annoying? Possibly. A pest control emergency? Absolutely not.
Bogong moths are migratory visitors. If you are seeing moths eating clothing, carpets, or stored food, or if you are finding small larvae or damage to fabric, that is a clothes moth or pantry moth issue — a separate and treatable pest problem. Contact our team if that sounds like your situation.
See it happening in Sydney right now
This video shows exactly what locals across Sydney are experiencing as the bogong moth migration moves through the city this spring.
Bogong moths swarming in Sydney, September 2026. Video via Facebook.
Why you should turn your outdoor lights off tonight
This is the single most useful thing you can do, both for your own comfort and for the moths.
Bogong moths are strongly attracted to artificial light. When they follow light sources instead of continuing their migration, two things happen:
- They cluster around your home in far greater numbers than they otherwise would.
- They fail to reach the alpine regions where they are ecologically critical.
Authorities have specifically asked residents to turn off any artificial light that does not need to be on overnight. This includes advice reported by Nine.com.au from wildlife and government bodies tracking the migration.
Practical steps tonight:
- Switch off outdoor decorative lights, garden lights, and porch lights if they aren't needed for security.
- Close blinds and curtains after dark to reduce light spilling outward.
- If you need outdoor lighting, consider motion-activated fixtures that are only on when required.
How to keep bogong moths out of your home
Because bogong moths are attracted to light, any room with lights on and an open entry point is an invitation. Here is how to reduce their access:
Seal gaps around doors and windows
Check door frames, window frames, and any gaps around vents or exhaust fans. Bogong moths are small enough to get through surprisingly narrow openings. Weatherstripping around exterior doors is a worthwhile investment beyond just moth season.
Install or repair fly screens
Fine mesh fly screens on windows and doors allow ventilation without letting moths in. If your screens have tears or gaps, now is the time to repair them.
Keep exterior doors closed after dark
A front door open for even a few minutes with the hallway light on can let dozens of moths inside. Keep exterior doors closed at night during peak migration periods.
Use warm-coloured lighting outdoors
Insects, including bogong moths, are less attracted to warm amber or yellow-toned LED lights than to cool white or blue-spectrum lights. If you need outdoor lighting during migration season, consider switching bulb types temporarily.
- Turn off interior lights near exits and open a window or door briefly to encourage them out toward exterior darkness.
- Gently guide moths toward an open door or window using a piece of paper or cardboard.
- Do not swat, spray, or kill them. They are an endangered species.
Why you should not harm bogong moths
Bogong moths are listed as endangered. Their numbers have declined significantly over recent decades due to drought, irrigation changes and land clearing in their breeding grounds across Queensland and central NSW.
They are not just ecologically interesting: they are a critical food source. According to reporting by Nine.com.au, Zoos Victoria notes that bogong moths are the primary food source for the mountain pygmy possum, a species that emerges from hibernation precisely when the moths arrive in the alpine region each spring. Without the moths, the possum's survival is directly threatened.
Harming bogong moths, or using pesticides to clear them from your property, is both ecologically harmful and contrary to advice from authorities. Please let them pass through.
What if you have a different moth problem?
Bogong moths are seasonal visitors. But if you're dealing with moths that have been present for weeks, moths that appear to be eating fabric or food, or if you are finding larvae or damage inside wardrobes and pantries, you are likely dealing with a different issue entirely.
Clothes moths (Tineola bisselliella) and pantry moths (Indian meal moths) are persistent indoor pests that do real damage and won't resolve themselves the way bogong moths will. They require targeted treatment.
Our licensed technicians cover a full range of pest treatments across Sydney. If you're unsure what type of moth problem you have, the best first step is a professional assessment. We'll tell you exactly what you're dealing with before any treatment begins.
You can also read our guides on what treatment types are used for different pests and what to do if you see a pest after treatment.
- Nine.com.au: Residents stunned as Sydney hit by swarm of thousands of bogong moths (27 September 2026)
- Zoos Victoria: Bogong moth and mountain pygmy possum ecology (cited in Nine.com.au reporting)
- Hawkesbury Police Area Command social media statement, September 2026 (cited in Nine.com.au reporting)
Frequently asked questions
Are bogong moths dangerous to humans?
No. Bogong moths are completely harmless to humans. They do not bite, sting, or carry disease. They are a nuisance pest at most, particularly around outdoor lighting.
Why are bogong moths appearing in Sydney right now?
Bogong moths migrate south each spring from Queensland and central NSW toward the NSW alpine regions. In September 2026, large numbers are passing through Sydney due to seasonal wind patterns pushing them toward coastal areas including the Hawkesbury, North Shore and Sutherland Shire.
How do I stop bogong moths coming inside my home?
Turn off non-essential outdoor lights at night, seal gaps around doors and window frames, install fine mesh fly screens, and keep exterior doors closed. Bogong moths are attracted to artificial light, so reducing light sources is the single most effective action.
Should I kill bogong moths?
No. Bogong moths are an endangered species and play a critical role in the alpine ecosystem as a food source for the mountain pygmy possum. Authorities urge residents not to harm them. Gently encourage them outside or wait for them to continue their migration naturally.
How long will bogong moths stay in Sydney?
Bogong moths are just passing through on their annual migration to the NSW and Victorian alpine regions. They typically move on within days depending on weather and wind conditions. The swarms are temporary.
Do bogong moths damage clothing or food?
Bogong moths do not eat fabric or stored food. Unlike clothes moths or pantry moths, they are migratory and do not seek out these materials. The main nuisance is their attraction to indoor and outdoor lights.
What if I have a different type of moth infestation, not bogong?
If you notice moths eating clothing, carpets or food stores, or if you see moth larvae, you likely have a clothes moth or pantry moth issue — which is separate from the bogong migration. Contact a licensed pest control technician for an assessment.