title: "Tiger Mosquito Map of Europe 2026: 369 Regions and Counting | Mosticare" date: "2026-04-03" excerpt: "The Asian tiger mosquito now inhabits 369 regions across 16 European countries. Explore the 2026 map, country-by-country spread, and where expansion is heading next." category: "climate" author: "Mosticare Editorial"

Tiger Mosquito Map of Europe 2026: 369 Regions and Counting

The Asian tiger mosquito -- Aedes albopictus -- has become one of Europe's most consequential invasive species. What began as isolated detections in Mediterranean port cities three decades ago has evolved into continental-scale colonisation. The latest data from the European Centre for Disease Prevention and Control (ECDC) paints a picture of relentless expansion that shows no signs of slowing.

The Current Map: 369 Regions, 16 Countries

As of mid-2025, Aedes albopictus is established in 369 regions across 16 EU/EEA countries. These are not temporary detections or isolated finds -- these are areas where the mosquito has established self-sustaining breeding populations that persist through multiple seasons.

The 16 countries with established tiger mosquito populations are:

  1. Italy -- The original European stronghold since the 1990s, with the densest and most widespread populations. Nearly every region of Italy now hosts established tiger mosquito populations.
  2. France -- Rapid expansion from the Mediterranean coast northward. The species is now present across much of the southern half of the country and advancing into northern departments at 20 km per year.
  3. Spain -- Established along the entire Mediterranean coast and expanding inland. Major cities including Barcelona, Valencia, and Malaga are well within the established zone.
  4. Greece -- Widespread across mainland regions and increasingly present on the islands.
  5. Croatia -- The Adriatic coastline and inland regions are both affected.
  6. Germany -- Established in southwestern regions, with expanding detections along the Rhine Valley and in urban areas further north.
  7. Austria -- Established populations in eastern regions, including areas around Vienna.
  8. Hungary -- Present in southern and western regions.
  9. Bulgaria -- Established in southern regions near the Greek and Turkish borders.
  10. Romania -- Growing presence in western regions.
  11. Slovenia -- Established in western areas near the Italian border.
  12. Portugal -- Present in the Algarve and expanding northward.
  13. Belgium -- Newly established populations in southern regions, representing the species' push into northwestern Europe.
  14. Malta -- Island-wide presence.
  15. Cyprus -- Newly established as of 2024.
  16. Slovakia -- Newly established as of 2024, marking expansion into Central-Eastern Europe.

The Growth Trajectory: A Decade of Acceleration

The expansion figures are extraordinary. In 2015, ECDC data showed the tiger mosquito established in 114 regions. A decade later, that number has more than tripled to 369 regions.

Critically, the rate of expansion is itself increasing. In the period from July 2024 to mid-2025 alone, new establishment was documented across 16 countries, including first-time establishment in Cyprus and Slovakia, and significant range extensions in Austria, Belgium, France, Germany, Greece, Hungary, Portugal, Slovenia, and Spain.

Research published in The Lancet Planetary Health documented that Aedes albopictus has expanded from a single region in one country to its current distribution over the past three decades. The mosquito's expansion rate in France -- from 6 km per year in 2006 to 20 km per year by 2024 -- illustrates how warming conditions are amplifying the speed of colonisation.

Country-by-Country: Where Expansion Is Hottest

Western Europe: The Active Front Line

France is the epicentre of current expansion dynamics. The tiger mosquito has moved steadily from its initial foothold along the Cote d'Azur into central and northern regions. The detection of a locally acquired chikungunya case in the Alsace region -- in northeastern France -- demonstrated that the mosquito's practical range already exceeds what many models predicted for this decade.

Belgium is watching its southern regions transition from detection to establishment. The proximity to France's expanding populations, combined with warming temperatures in the Wallonia region, makes further spread across the country a near-certainty.

Central Europe: The Next Frontier

Germany's situation illustrates the pattern of urban-led colonisation. The species has established itself in cities along the Rhine Valley and the Upper Rhine Plain, where the urban heat island effect creates microclimates 2 to 5 degrees warmer than surrounding countryside. According to projections by the European Commission, cities like Frankfurt are already climatically suitable for year-round establishment.

Austria's eastern lowlands, particularly around Vienna, provide conditions that increasingly match the mosquito's preferred range. Slovakia's first confirmed establishment in 2024 opens a corridor into the broader Pannonian Basin.

Southern Europe: Consolidation and Intensification

In the Mediterranean countries where the tiger mosquito has been present longest, the story is not about expansion but about intensification. Italy, Spain, and Greece are seeing mosquito densities increase, transmission seasons lengthen, and the species move into remaining gaps in its distribution.

Italy's experience is instructive. As the country with the longest history of tiger mosquito presence in Europe, it has seen populations grow dense enough to sustain significant disease outbreaks. The 2025 chikungunya epidemic, which produced 384 locally acquired cases in Italy, demonstrated what consolidation looks like in practice.

Eastern Europe: Emerging Pathways

Romania and Bulgaria represent the southeastern expansion corridor. The mosquito's presence in these countries connects the well-established Mediterranean populations with potential expansion routes into the Black Sea region and beyond.

The Projection: Where Are Mosquitoes Heading Next?

A climate and population-dependent diffusion model published in Nature in 2025 forecast the future trajectory of Aedes albopictus across Europe. The findings point to several key expansion zones:

Western Europe -- Belgium, Luxembourg, and the Netherlands will provide increasingly favourable conditions. France will see the species continue its advance into northern departments.

The United Kingdom -- Southern England and Wales are projected to become suitable for establishment, with London already identified as climatically viable. The urban heat island effect in British cities could provide the marginal temperature boost needed for the mosquito to survive winter.

Germany and Beyond -- Expansion across Germany will continue, with models suggesting suitability extending into Denmark and the southernmost parts of Scandinavia.

The Baltic States -- Longer-term projections indicate potential suitability in parts of the Baltic region as warming trends continue.

What the Map Means for Public Health

The expansion of the tiger mosquito map is not merely an ecological curiosity. Every newly colonised region represents a new area where dengue, chikungunya, and Zika virus transmission becomes possible.

The ECDC's World Mosquito Day 2025 report noted that Europe set new records for mosquito-borne diseases. In 2024, the EU recorded 304 autochthonous dengue cases, exceeding the previous 15-year combined total.

Transmission duration varies significantly by region but is extending everywhere. According to research cited by ScienceDaily, transmission currently lasts two to three months in summer across much of the continent, but extends to four to six months in southern and eastern Spain and Portugal. Malta faces potential transmission risk from March through November.

Monitoring the Map: How ECDC Tracks the Spread

The ECDC maintains its mosquito surveillance maps as a continually updated resource. The maps are built from data submitted by EU/EEA member states and neighbouring countries, using standardised monitoring protocols that include ovitraps, adult trapping, and citizen science reporting.

The maps classify each region by the mosquito's status: introduced (detected but not established), established (self-sustaining population confirmed), or absent. This classification system allows public health authorities to calibrate their response based on the local stage of colonisation.

What Individuals Can Do

Understanding the tiger mosquito map is the first step toward effective personal protection. If you live in or travel to any of the 369 established regions -- or the many areas on the expanding frontier -- mosquito protection should be part of your daily routine during the active season.

Eliminating standing water around homes, installing window and door screens, and using effective personal protection products are all evidence-based measures that reduce exposure. As the map continues to expand, these practices will become essential for an ever-larger share of the European population.

The tiger mosquito map of 2026 tells a story of a species that has found in Europe a continent reshaped by climate change into exactly the kind of habitat it thrives in. The 369 regions are not the end of the story -- they are a milestone on a trajectory that will reshape how Europeans think about, prepare for, and live alongside mosquitoes.

Sources