Answers

Usually not, if she is fully claustral, which covers most of the common species people find after a flight. She raises the first workers on her own flight muscles and stored fat. Semi-claustral queens are the exception and do have to be fed through founding.

It means the queen seals herself into a chamber after mating and raises her first brood without leaving or taking in any food. The energy comes from the flight muscles she no longer needs and the fat she built up before the nuptial flight.

One who cannot cover the whole founding period from her own reserves and forages during it. Australian bull ants (Myrmecia) hunt their way through founding, some American seed harvesters such as Pogonomyrmex californicus do too, and Myrmica rubra, the red ant that flies in Britain from August into September, is usually listed as semi-claustral.

She may be socially parasitic. Lasius umbratus in Europe, and the American citronella ants such as Lasius murphyi, found by entering an established colony of another ant and having its workers rear the brood. Alone in a test tube there is no route to a first worker, however well she is kept.

No. Lasius niger is fully claustral and Lasius umbratus is a social parasite; both queens are 8 to 9 mm and both are on the wing in late summer. North America has the same problem with Lasius neoniger and the citronella ants that parasitise it. You need the species, not the genus.

A forecast is not a measurement of where you are standing. It is a model's best guess at the average state of a box of air a few miles across, and your garden is one spot inside that box. A sheltered sunny corner runs warmer than its own box on most afternoons.

It varies by model. The service this app takes its weather from picks the finest model covering your location, and those run from about 1 to 11 km / 0.6 to 7 miles across. ERA5, the reconstruction everyone leans on for past weather, works in boxes of about 31 km / 19 miles, which is wider than most cities.

Because a summer shower is often smaller than the box the forecast describes. Global models work in boxes around 9 to 11 km / 5.6 to 7 miles wide, and rain falling on a fraction of that gets averaged across all of it. A downpour on one estate comes out as a light sprinkle everywhere.

More than anything else at that scale. Air cools by roughly 5 to 10 °C / 9 to 18 °F for every kilometre / 3,300 feet you go up, and in hilly ground one forecast box can hold that much height between its lowest and highest point.

Because each one now gets its own weather reading. They used to share one reading between several neighbours, which made a patch of the map look uniform when the ground underneath it was anything but.

No public weather model reaches it. A wall, a tarmac drive or a shaded damp lawn all work at scales of metres / feet. That difference is real, it matters a lot to ants, and it will always sit outside what a forecast can see.

No. The black garden ant, Lasius niger, flies from early July to about mid August, and because it is by far the most abundant British species its swarms are what people notice. Other British species fly on through August and September, and a few reach October.

Several. The yellow meadow ant Lasius flavus flies in late July and August, the red ants of the genus Myrmica run from July into September depending on the species, the parasitic Lasius umbratus flies from mid August to late September, and Lasius mixtus flies in August and September.

Partly abundance and partly biology. Lasius niger is the commonest ant in most British gardens, so its flights are the largest by sheer numbers. The later species are less numerous, several of them are tiny, and they fly in short local bursts rather than in one synchronised swarm.

No. It is too late for the easiest catch of the year, which is a black garden ant queen walking across a pavement on a July afternoon. August and September queens take more looking for and are often much smaller, but they are out there.

Stenamma debile is the usual answer, with alates most often collected in late September or October. The thief ant Solenopsis fugax also flies into October, and Lasius sabularum has been recorded flying as late as October too.

Put her in a small dark container somewhere warm and quiet, and leave her undisturbed. Most common founding queens do not need feeding while they raise their first brood, because they live on the muscle and fat left over from the flight.

Usually not. Fully claustral queens, which includes most of the common garden species people find after a flight, seal themselves away and use their own body reserves until the first workers can forage. Some genera do need feeding, so it is worth confirming what you have before you decide.

Far less often than you want to. Light and vibration are stressful to a queen who is trying to stay sealed in, and repeated disturbance is a common reason brood gets eaten or abandoned. Once a week is plenty.

Typically several weeks from eggs to the first workers, varying by species and how warm she is kept. Nothing visible happens for a while, and that is normal rather than a sign something has gone wrong.

You mostly don't, until she lays. A queen found walking with her wings already shed is a good sign, because shedding usually follows mating, but it is not proof. If several weeks pass with no eggs at all, an unmated queen is the likely explanation.

A drone-mounted trap flown through nuptial flights caught ants between 15 and 120 metres up, most species clustering between 60 and 110. Separately, altitude loggers fitted to insect-eating birds in Oklahoma recorded ants up to around 160 metres. Both studies used small samples and few species, so treat these as a first sketch rather than settled figures.

The opposite, and two independent studies agree. Wing surface area had a significant negative effect on capture altitude in the drone study, and maximum altitude fell by 60% from the lightest species to the heaviest in the Oklahoma bird study. The exception is species whose queens mate on the ground rather than in the air, which stay low whatever their size.

Yes. Alates are roughly raindrop-sized and reflect the beam in much the same way, so a dense enough swarm reads as a band of light rain until a forecaster cross-checks it against rain gauges and finds nothing falling on the ground.

Height does two jobs. It mixes queens and males from different colonies, which is the entire point of flying at all, and it hands the queen to the wind so she comes down somewhere other than on top of her mother's nest.

Heavily. Gulls and starlings work a swarm at low level where you can watch them do it, and swifts take aerial insects much higher up. Flying ants turn up in swift diet samples often enough that researchers have used them to date nuptial flights.

Because the two nests are not reading the same conditions. Soil warmth, shade, nest depth and the age of the colony all differ across a few metres, and a nest under warm paving reaches flight conditions hours or weeks before one under a shaded lawn.

No. Colonies of the same species tend to fly in the same sort of weather, which is why swarms often cluster, but the citizen-science survey work found no meaningful geographical coordination. Neighbouring gardens routinely fly a fortnight apart and both are normal.

Unlikely. A colony has to be several years old and reach a certain size before it makes winged ants at all, so a young nest is present and simply not reproducing yet. Flights also run for only a few hours, so yours may have happened while you were out.

Quite possibly. The black garden ant (Lasius niger) takes any warm, humid, still afternoon it gets, and other species have their own months. The yellow meadow ant (Lasius flavus) usually goes up in the second half of August, in flights that are smaller and easier to miss. Wherever you are, the local species list sets the calendar.

There wasn't one. Winged ants were reported from 21 June, again in force around 5 July, and swarms showed on Met Office weather radar on 8 July. The widely quoted windows of 20 to 25 and 24 to 29 July arrived after a large share of the queens had already flown.

Because they were answering a question that has no single answer. Published windows ranged from 7 to 20 July through to 24 to 29 July with a second wave around 2 August. Between them they covered most of the summer, which is roughly what the survey data says actually happens.

Yes, on 8 July, during the third heatwave of the year. Alates are about the size of raindrops and reflect radar in much the same way, so a dense swarm can read as a band of light rain until forecasters check it against ground observations.

No. Black garden ants will fly on any warm, humid, still afternoon they get, and August belongs to other species anyway. Lasius flavus, the yellow meadow ant, usually goes up in the second half of August.

Bigger and earlier is a fair description, though nobody counts ants nationally so there's no hard number. 2026 has had more days above 30 degrees than the whole of 1976, which means far more afternoons met the conditions ants need.

The records point that way. Helms (2022) analysed a century of North American museum specimens and found nuptial flight dates advancing over time as the climate warmed, at roughly a day per decade across about a quarter of the native species studied.

From museum collections. Every pinned winged ant carries a label with the date and place it was caught, and a flying queen or male was almost certainly collected on or near its flight day. Enough of those labels, across enough decades, become a record of when flights happened.

No. A slow trend measured over a century tells you nothing about which afternoon a flight will happen this July. Dealate scores the odds from this week's weather, and does not claim to predict the long-term climate trend or to have called any particular year.

On the order of a day per decade, in the species that shifted. It is a slow drift, not a dramatic jump, and it sits on top of the much larger differences you already get between species, between warm and cold summers, and between one town and the next.

Down. Once she has mated in the air a queen lands, breaks off her wings, and looks for a spot to dig in. So a few hours after a swarm the queens are on the ground, walking along paths, walls and paving, not still up in the air.

Size and shape. A queen is noticeably bigger than a worker of the same species, with a bulkier middle section that carried her flight muscles. Just after a flight she may still have wings or two wing stubs, and she is usually on her own rather than in a trail.

It depends where you are. Many common species are fine to keep, but some countries and regions protect certain ants or ban keeping non-native ones, and taking anything from a nature reserve is usually off limits. Check your local rules before you collect.

Founding a colony alone is brutal. A newly landed queen has to find a safe chamber, seal herself in, and raise her first workers on her own body reserves before anything eats her or she dries out. The overwhelming majority never get that far.

It is the mating flight of an ant colony. Once a year a mature colony releases winged queens and males into the air, they mate, and the queens come down to found new colonies. It is the only time most ants ever leave the nest with wings.

Only the queens and males grow wings, and only for the flight. Wings let them leave the nest, spread out, and meet ants from other colonies in the air. Once a queen has mated she has no more use for them, so she breaks them off and never flies again.

No. Males exist for the flight and nothing else. They mate in the air and die within a day or two, having never fed themselves or done any work in the nest.

Usually once a year, in the right weather for its species. A colony has to reach a certain size and age before it produces winged ants at all, which for many species takes a few years.

It depends on the genus, and the spread is enormous. Some fly in the first hour of daylight, some in mid-afternoon, some at dusk, a few in the middle of the night. There's no single hour that covers ants in general.

No. Veromessor flies at dawn, Forelius around midday, Pogonomyrmex mid-afternoon, Camponotus after dark. Two genera flying over the same lawn on the same afternoon can be twelve hours apart.

Partly to dodge different hazards (birds by day, heat at noon, cold at night), and partly to stay separate from each other. A flight only works if a colony's queens and males meet others of their own species, so flying at an hour the neighbours don't is a cheap way to arrange that.

Carpenter ants (Camponotus) are the classic, and they come to lights, which is why porch lights are worth checking. Stenamma is properly nocturnal, and the Texas leafcutter Atta texana flies in the small hours before dawn.

The evidence says no. In Hart et al. 2018, the largest study of UK flying ants, pressure showed no significant association with flight days (chi-square 0.2, P = 0.687), while temperature and wind speed both did.

Because the conditions that really do set off a flight, warmth and humidity and still air a day or so after rain, tend to arrive in the same muggy weather that runs ahead of a summer storm. Pressure is falling while all that happens, so it looks like the cause.

Warmth, humidity and low wind, often in the days after rain has softened the ground. Each species responds to its own combination, which is why there's no single flying ant day.

No. Pressure isn't an input to the model. Adding a variable the evidence doesn't support would make the forecast sound more thorough without making it any more correct.

No. They're the same garden ants you see all summer, with wings for a few hours during their mating flight. They can nip if you handle them, but they aren't aggressive and they can't damage the building.

Almost never. A nuptial flight is a passing event, not an infestation, and the winged ants indoors came from a nest outside. The exception is winged ants emerging indoors repeatedly over several days from the same spot, which can mean a nest in the structure.

Colonies of the same species time their flights to the same weather, so that queens and males from different nests actually meet. Warm, humid, still conditions, often a day or two after rain, will set off a lot of nests at the same time.

A single flight runs a few hours, not a day. The season as a whole stretches over weeks, because different species and different colonies each wait for their own conditions.

They fly towards light. On a grey evening your window is the brightest thing for fifty metres, so a flight happening over the garden ends up looking like an event in your kitchen.