Vienna's mosquitoes stay by the still water. Austria's Alpine trails have the ticks.

Some. In Vienna they gather at dusk around the city's still water, at the Alte Donau, the Danube Canal and the Prater, while the center tends to be light, and late summer brings a small West Nile season in and around the city. Salzburg, the Salzkammergut lakes and the trails of Tyrol see fewer mosquitoes, and there the ticks that can carry tick-borne encephalitis (TBE) are the bite to plan for.

Vienna and the Danube at dusk

Vienna's mosquitoes breed in still water, so the fast-flowing main Danube tends to be lighter than the Alte Donau, the slow Danube Canal and the Prater. An evening swim or picnic at the Alte Donau or on the Donauinsel, drinks by the canal or a late walk in the Prater calls for repellent. The daytime-biting tiger mosquito is spreading in Vienna, Graz and Linz too, so a courtyard café can bring bites.

On a Danube river cruise through the Wachau, put repellent on before dinner on deck and keep the cabin window closed at dusk. The routine matters most on the stretch into Vienna, where most of Austria's West Nile cases are counted.

West Nile in and around Vienna

West Nile, spread by Culex mosquitoes that bite in the evening and at night, recurs at a low level in eastern Austria. Austria has had human cases of West Nile or Usutu, a related mosquito-borne virus, nearly every year since 2009, a 2026 study in Eurosurveillance found. The European Centre for Disease Prevention and Control (ECDC) counted 34 locally acquired West Nile cases in 2024, most of them in northern Burgenland and Vienna, then none in 2025 and 8 in 2026 as of October 21. Six of this year's were in Vienna, one in northern Burgenland and one in the area just north of the city, and no deaths were listed.

Across Europe, West Nile cases peaked at the end of August in 2026. If you're 65 or older or have a weakened immune system, take the dusk routine most seriously in August and September in and around Vienna.

The lakes and the Alps: plan for ticks

Salzburg, the Salzkammergut lakes around Hallstatt and the Wolfgangsee, and the mountains around Innsbruck tend to be light on mosquitoes. Horseflies tend to be the bigger nuisance in Alpine meadows in July, and a small bathing lake can be the exception. The bite with health stakes here comes from ticks, and CDC's advice on the TBE vaccine is in the questions below.

ECDC counted 206 confirmed TBE cases in Austria in 2022. That number understates the risk to a visitor, because many Austrians are vaccinated. Cases tend to cluster in Upper Austria, home of Hallstatt, and in Tyrol and Salzburg. If you'll spend days hiking or camping in the Alps, the Salzkammergut or other forests, take the plan to a travel clinic 4–6 weeks before departure. On the trail, use a repellent with 20% or more DEET, which CDC advises when you need protection from both ticks and mosquitoes, reapply on long days (our repellent timing guide has the numbers), and check your whole body for ticks after each outing. Ticks stay active from spring into autumn, so a May or October hike needs the same habit.

Where you're going

How the main stops compare for a June–September trip.

Sailing on to Budapest, or adding Prague or Munich? See our Hungary, Czech Republic and Germany briefings.

What travelers report

Paraphrased from TripAdvisor forum threads and reviews and linked so you can read them in full. None is dated, most are older posts, and an evening by the water changes a lot with the weather.

• Vienna (Alte Donau, Danube Canal, Prater) · summer

  Posters in Vienna Forum mosquito threads said mosquitoes breed in still water such as the Alte Donau rather than in the fast main Danube, named the Summerstage venue beside the slow Danube Canal and the Prater as buggy spots, and found central Vienna largely unaffected. TripAdvisor ↗

• Salzburg

  A poster said they had never found mosquitoes much of a problem in Austria and that they are far less aggressive than in hotter places such as Greece. TripAdvisor ↗

• Zell am See · July

  A reply said mosquitoes are not a problem in Zell am See but warned about horseflies in the meadows in July. TripAdvisor ↗

• Reither Badesee, Reith im Alpbachtal (Tyrol)

  A reviewer described a small artificial bathing lake with lots of biting mosquitoes and no repellent on sale at the entrance booth. TripAdvisor ↗

• Innsbruck · summer heat

  A poster reported no mosquitoes at all at lakes and in forests around Innsbruck, even in mid-30s Celsius heat. TripAdvisor ↗

One more rule outlasts the trip. Any fever during or after your trip means a doctor visit, and you tell them you were in Austria and whether you found a tick.

Traveler questions