Every summer, without fail, flying ants appear across the North West in huge numbers. For most people, it is a brief seasonal nuisance — a day or two of winged insects swarming around gardens, pavements, and windows. But for some homeowners and businesses, flying ants emerging from inside the property are a sign of something that needs attention. This guide explains what is actually happening, when to expect it, and when to call a pest controller.
Flying ants are not a separate species. They are the winged reproductive males and queens produced by black garden ant colonies (<em>Lasius niger</em>) as part of their annual mating cycle. For most of the year, a garden ant colony consists entirely of wingless worker ants. In late summer, the colony produces a new generation of winged males (drones) and winged queens, which are much larger than the workers.
On a suitable day — typically warm, humid, and calm, following a period of settled weather — these winged ants emerge from the nest and take to the air in what is known as a nuptial flight. The males and queens mate in the air, after which the males die and the mated queens land, shed their wings, and attempt to found new colonies. The queens that survive predation and find a suitable nest site will spend the rest of their lives underground, potentially living for 15 years or more and producing millions of workers.
Flying ant season in the UK typically runs from late June through to early September, with the peak activity usually occurring in July and August. The timing varies from year to year depending on weather conditions. Flying ants tend to emerge on warm, humid days with low wind speeds — often after a period of hot, dry weather followed by a warm, overcast day.
A notable feature of flying ant season is that colonies across a wide area often release their flying ants on the same day or within a very short window. This synchronisation is thought to be triggered by shared environmental cues and increases the chances of queens from different colonies mating with unrelated males. In some years, this produces very large, highly visible swarms across entire neighbourhoods simultaneously.
In the North West — across Merseyside, Cheshire, Greater Manchester, and Lancashire — flying ant season typically peaks in mid-July to mid-August, though warm summers can bring earlier or more prolonged activity.
For the vast majority of people, flying ants are a harmless seasonal nuisance. They do not sting, do not bite (or very rarely), and do not damage property. The swarms can be unpleasant — particularly if large numbers enter a building through open windows or doors — but they disperse naturally within a day or two as the mating flight concludes.
Flying ants can be a significant problem for some people with allergies, as ant bodies contain formic acid and other compounds that can trigger reactions in sensitive individuals. If you experience an allergic reaction to ant bites or stings, seek medical advice.
Flying ants entering a building through open windows, doors, or roof vents during flying ant season are not a sign of a nest inside the property. They are simply following light and warmth, as they would do naturally outdoors. Closing windows and doors during peak flying ant activity is usually sufficient to prevent them entering.
However, there are situations where flying ants inside a property do indicate a problem that requires attention:
Flying ants emerging from inside the building structure — If flying ants are consistently emerging from under floorboards, from wall cavities, from around window frames, from roof spaces, or from beneath skirting boards, this indicates that a garden ant colony has established a nest within the building fabric. This is more common in older properties with gaps in the structure, and in properties with timber floors or suspended ground floors.
Flying ants in winter or early spring — Garden ants do not produce flying ants outside of their summer mating season. If you see winged ants inside your property in winter or early spring, they are almost certainly not garden ants. Winged ants seen indoors out of season are more likely to be pharaoh ants or another tropical species that has established itself in a centrally heated building — and these require specialist treatment.
Persistent ant activity throughout the year — If you are seeing worker ants inside your property throughout the year — not just during flying ant season — this suggests a nest either within the building or very close to it, and professional treatment may be needed.
For most households, the practical steps during flying ant season are straightforward. Keep windows and doors closed or screened during peak activity. If large numbers of flying ants enter the property, a vacuum cleaner is the most effective way to remove them quickly. Avoid using insecticide sprays indoors for flying ants that have simply entered through an open window — the problem will resolve itself within a day or two.
If you have a garden ant nest close to the house — under paving, in a lawn, or at the base of a wall — treating the nest in spring or early summer, before flying ant season, will prevent the colony from producing flying ants that season. Country Pest Solutions can treat active garden ant nests with professional-grade insecticide applied directly to the nest entrance, which is significantly more effective than consumer ant powders.
Call a professional pest controller if flying ants are emerging from inside your property's structure rather than entering from outside, if you are seeing winged ants indoors outside of the summer mating season, or if you have a persistent ant problem that has not responded to DIY treatment.
Country Pest Solutions provides professional ant treatment across the North West, including treatment of garden ant nests, ghost ant infestations, and pharaoh ant problems in commercial and residential properties. We can treat active nests before flying ant season to prevent swarms, and we can identify and treat nests within building structures where flying ants are emerging indoors.
For more information about the ant species we treat and our treatment approach, see our [Ant Control service page](/ant-control). If you are not sure whether you have ants or another pest, our [pest identification guide](/blog/how-to-identify-your-pest-problem-before-calling) can help.
Call us on **01744 382 482** or **07935 550 169** for advice or to book a treatment. We are available 7 days a week across St Helens, Liverpool, Warrington, Wigan, Chester, Wirral, and the wider North West.
Available 7 days a week across St Helens, Warrington, Liverpool and the North West.