Asian Hornets in October 2026: Why This Is the Month of the Queens, and What It Means for Your Garden

Introduction: the month that decides the following year

We tend to associate the Asian hornet (Vespa velutina nigrithorax) with summer: hive attacks in August, nests discovered in the middle of a heatwave, emergency call-outs above a terrace. Biologically, however, the decisive moment in the annual cycle falls between mid-September and late November. It is now, in October, that colonies reach their maximum size and switch from producing workers to producing reproductives: males and future queens.

A single mature colony can release several hundred potential queens before dying off with the first frosts. Each one, if it survives the winter, is a potential nest the following spring. In other words: what happens in your garden in October 2026 directly determines how many nests your town will have in 2027.

October's second distinctive feature is leaf fall. An Asian hornet nest, often built 10 or 15 metres up in the canopy of an oak, a plane tree or a poplar, is almost invisible in July. In October the foliage thins out and the grey mass suddenly appears. Hence the spike in reports at this time of year — and a very common confusion between "nest discovered" and "nest dangerous".

This article is not a rehash of the general Asian hornet guide. It deals with one specific window — the next six to eight weeks — and three practical questions: should a nest found in October be destroyed, how do you make a garden safe while the colony is swarming, and what should you start preparing now for spring trapping.

Where the colony stands in early October

The biological calendar of Vespa velutina

The cycle is annual and strictly seasonal. In summary:

The figure that matters: from late September onwards, the colony stops investing in workers and devotes its resources to reproductive individuals. Research by the Muséum national d'Histoire naturelle and INRAE, which have tracked the species since its accidental introduction in Lot-et-Garonne around 2004, estimates that a mature nest produces on the order of 300 to 500 future queens, of which a very small share (a few per cent) will survive the winter and actually found a colony.

Why hornets seem more aggressive right now

Three factors combine in October:

• Density: there are never as many individuals in and around the nest as at this time of year.
• Dwindling resources: prey insects are becoming scarce, so hornets switch en masse to sugars — fallen fruit, grapes, flowering ivy, bins, café terraces. Hence the close encounters near apple trees and vines.
• Defence of the reproductive brood: the colony is protecting larvae that represent its entire investment for the year. The defence zone around the nest, often quoted as 5 metres in summer, can extend further in autumn, especially in response to vibration (lawnmower, hedge trimmer, brushcutter).

This is precisely why most of the serious accidents recorded in France happen during autumn gardening work: a hedge trimmed without first spotting the nest, a tree pruned, a garden shed moved. Before any serious pruning session, an inspection through binoculars from the ground is better than a discovery three metres up. A pair of compact 10x42 binoculars makes this survey far more reliable than a naked-eye glance into a backlit canopy.

Should a nest found in October be destroyed?

This is the most frequently asked question at this time of year, and the answer is not one-size-fits-all.

When destruction still makes sense

Destruction is justified if the nest is still active and in the immediate vicinity of a frequently used area:

• terrace, play area, house entrance, unavoidable pathway;
• premises open to the public (school, nursery, campsite, care home);
• apiary, farm, ongoing building site;
• a household with someone known to be allergic to hymenoptera venom.

In these cases, destroying the nest in October has two benefits: immediate safety, and the elimination of reproductives that have not yet left the nest. The earlier in the autumn the intervention takes place, the greater the share of future queens neutralised.

When it is largely pointless

If the nest is high up, isolated, at the far end of the plot, well away from any foot traffic, and it is already late November, destruction achieves almost nothing: the reproductives have gone, the colony is doomed by the cold, and the nest will never be reoccupied. This is a point poorly understood by the general public: an Asian hornet nest is a single-use object. By spring it has been dismantled by the weather and by birds.

An empty nest in winter is not a danger. Paying a lot to destroy it in December buys peace of mind, not pest control.

What you must never do yourself

The same news stories come round every autumn. Absolutely to be avoided:

• shooting at the nest (the nest opens up and the colony scatters at ground level);
• burning the nest or spraying it with a flammable liquid (risk of fire and severe burns);
• hosing it down with water or throwing objects at it;
• intervening during the day, when some of the workers are out flying;
• climbing a ladder with an over-the-counter insecticide spray: household aerosols have neither the range nor the power required, and falling is the main fatal risk.

Destruction is a job for properly equipped professionals: certified specialist suit, telescopic injection pole, authorised biocide. Prices observed in France generally run from €80 to €150 for a low, accessible nest, and €150 to €400 above 8 to 10 metres or in awkward configurations (roof, chimney, cherry picker required). Some towns and district councils subsidise all or part of the work: the town hall is the first place to call. To compare quotes and understand what is being charged for, our dedicated page on pricing and services breaks down the usual line items.

Making your garden safe during the swarming phase

Cut down sugar sources

Since hornets switch to carbohydrates in October, the first measure is practical housekeeping:

• pick up fallen fruit (apples, pears, figs, grapes) at least twice a week;
• seal compost bins and rubbish bins tightly; bins with a poorly fitting flip lid are hornet vending machines;
• cover sugary drinks outdoors; open cans left on a table are a classic cause of stings inside the mouth, which is an absolute medical emergency because of the risk of airway swelling;
• postpone trimming flowering ivy, highly attractive at this time of year, until the first frosts.

What to do if you meet one

Away from its nest, the Asian hornet is no more aggressive than a wasp. The rules fit in three lines:

• no sudden movements, and never swat at the insect with your hand;
• move away calmly in a straight line, without running or crouching;
• if you have come within 5 metres of a nest and hear a collective buzzing growing louder, back off immediately: that is the colony's warning signal.

Stings: what the medical guidance says

Asian hornet venom is not in itself more toxic than that of a common wasp; the difference lies in the quantity injected and the ability to sting repeatedly. According to the guidance relayed by Ameli and Vidal:

• a local reaction (pain, redness, swelling) is treated by washing with soap and water, applying cold, and monitoring;
• a generalised reaction — widespread hives, difficulty breathing, faintness, swelling of the face or throat — means calling 15 or 112 without delay;
• multiple stings (more than about twenty in an adult, far fewer in a child) require hospital care;
• people already known to be allergic must keep, at all times from May to November, an emergency kit with an auto-injector pen prescribed by an allergist.

For immediate care after a minor sting, a venom extractor pump and an instant cold pack in the garden first-aid kit save you fetching ice from the other end of the house. These items relieve pain; they never replace a call to the emergency services if there are systemic symptoms. Poison control centres also stress that no "home remedy" (urine, vinegar, ammonia) has been shown to work.

Start preparing now for spring trapping

Why autumn trapping backfires

This is the most counter-intuitive point in the whole subject, and it deserves to be stated plainly: trapping in autumn does not reduce the Asian hornet population. The vast majority of the future queens caught in October and November would have died over the winter anyway. Sugar-baited traps set at this season, on the other hand, kill huge numbers of non-target insects: native wasps, bees, hoverflies, butterflies, beetles. The Muséum national d'Histoire naturelle and the Office français de la biodiversité regularly warn about this collateral damage.

The right window: February to April, around apiaries

Trapping has demonstrated value in one specific setting: immediately next to an apiary, at the time queens emerge from hibernation, which depending on the region means mid-February to late April. At that stage, every queen caught is an entire colony avoided, and pressure on bees in spring drops.

Three conditions make it acceptable:

• use selective traps with calibrated holes (around 5.5 to 6 mm) that let small insects escape;
• choose baits that are unattractive to bees: a mix of dark beer, white wine and fruit syrup, the white wine acting as a bee repellent;
• check and sort the catch regularly, and remove the traps by mid-May.

Beekeepers usually fit their hive entrances with a hornet muzzle guard during the summer, a grille that blocks hornets while letting foragers through. For a hobby apiary, it is the most cost-effective investment before trapping. And for those who want to understand the species' behaviour in depth before acting, a hymenoptera identification guide prevents the very common confusion with the European hornet, a protected and beneficial species whose nests should not be destroyed without good reason.

Telling the two species apart

The yellow legs are the most reliable field marker, hence the nickname "yellow-legged hornet".

Reporting: a useful and free step

Since Vespa velutina was classified as an invasive alien species of Union concern (EU Regulation 1143/2014) and as a category two health hazard for honeybees in France, reporting feeds into genuine monitoring systems.

In practice, in October 2026:

• report the nest to the town hall, which often acts as the central point for requests and knows about local support schemes;
• file a report on the national Asian hornet reporting platform (interministerial portal) or with your county's GDS (animal health protection group);
• alert the nearest beekeeper if the nest is in a rural area: the information is directly useful to them.

Reporting does not automatically trigger a free destruction — policies vary from one county to another — but it feeds the mapping that guides how public resources are allocated.

Summary: your October checklist

• Look: now that the leaves are falling, scan the crowns of large trees in your garden and on neighbouring plots, binoculars in hand, from the ground.
• Assess: nest near a living area → professional intervention; isolated nest at the back of the plot → observation and reporting are enough.
• Never climb, shoot, burn or spray it yourself.
• Tidy up: fallen fruit collected, bins and compost bins closed, drinks covered.
• Protect yourself: up-to-date emergency kit for anyone allergic, emergency number to hand.
• Don't trap now: postpone selective trapping to February–April, near apiaries only.
• Report to the town hall and on the national platform.
• Plan ahead: if your area has had several nests this year, schedule a winter inspection of sheds, garden stores and roller-shutter housings where queens sometimes overwinter.

For infestations that go beyond the garden — a nest in a roof, in a block of flats, in premises open to the public — it is better to call in a specialist company than to improvise. And for seasonal prevention gear, our product selection brings together the protective and trapping equipment that is genuinely useful through the year.

Sources

• Muséum national d'Histoire naturelle — Inventaire national du patrimoine naturel, Vespa velutina nigrithorax factsheet
• INRAE — research on Asian hornet population dynamics and trapping
• Office français de la biodiversité — recommendations on trapping and non-target species
• Ministère de l'Agriculture — order classifying Vespa velutina as a category two health hazard
• Regulation (EU) No 1143/2014 on invasive alien species
• Ameli and Vidal — what to do in the event of a hymenoptera sting