We provide here pollen forecasts and recommendations, that are based on our scientifically evaluated data and our expertise. It is our aim to inform persons concerned by pollen allergies in Vienna in a most comprehensive, accurate way and free of charge.
Video Highlight: Dusting yew and cypress family 2026
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They are considered rare allergens in Austria, with cypress trees classified as more allergenic than yews. Their pollen cannot be distinguished under a light microscope.
Current pollination
LEGEND
Due to current cause:
When does the birch pollen season start?
It will still take a while until the birch trees are ready to flower as you can see from the immature catkins here. This is one of our reference plants that which is flowering early in the season (as of March 9, 2026).
Figure: : flower of ash in full flower (the yellow dust is pollen)
Mid- and long-term forecast for Vienna
This forecast gives you an overview for a longer time period so that you can improve your planning.
Ash will be the main aeroallergen - alder pollen may still reach increased pollen concentrations!
More and more ashes start to flower and some are in full flower (see image). Pollination has increased significantly as forecasted and will remain on a stable level with the potential of soon reaching high values.
Ash belongs to the olive family which explains possible cross-reactions to related plants. These include: olive, lilac, jasmine, forsythia and privet.
Weather will not be as spring-like as before and does not provide ideal conditions for pollination on every day. Real breaks from pollination are not in sight, but pollen concentrations may decrease on certain days.
The early flowerers hazel and alder approach the end of their flowering time and cause decreasing pollination. Alder pollen may still reach increased values. Hazel pollen concentrations attain only low values. Corkscrew hazel (a decorative form of common hazel) is in flower.
Note: Elm and poplar experience an intense flower this year and cause increased pollination at the moment. Both are a rare source of a pollen allergy in Austria. We mention them as an exception outside of the pollen spectrum, because the deviation from the normal is striking.
Pollination profile
Ash:
state of the flower: begin of pollination period/pollination
trend: increasing
time of the start of the flower: average
Alder:
state of the flower: main pollination period/pollination
trend: decreasing
time of the start of the flower: later
Hazel:
state of the flower: main pollination period/pollination
trend: decreasing
time of the start of the flower: later
You can find the typical pollen seasons in our pollen calendar.
Pollen spectrum:
Pollen from maple, willow, poplar, cypress, elm and yew is also in the air.
Current main allergen: Ash
Pollination time in Vienna: March to May
Occurrence in Vienna: Ash is a pioneer tree and can occur at different locations. It prefers damp forests, but it is often found as well in parks.
Who is “the ash“?
Three species are of relevance in Vienna.
Common ash (Fraxinus excelsior): It grows in the lowlands but can reach also higher altitudes. The shoot and twig dieback is a serious concern. Currently we cannot observe a reduction in pollination, but this could be due to a stress reaction that causes a higher pollen production.
Manna ash (Fraxinus ornus): It originates from the Mediterranean area and became endemic as decorative plant and street tree, but also as a neophyte. A particularity is that it is insect pollinated, but still wind pollinated as well in a certain extent, which results in the release of relevant ash pollen amounts in the air.
Narrow-leafed ash (Fraxinus angustifolia): It can be found in Middle Europe on occasion in parks. It originates from southern Europe.
Cross-reactivity to pollen of other plants: olive tree
- The Pollenservice Vienna is part of the University Department of Otolaryngology, Head and Neck Surgery at Medical University of Vienna.
- The collaboration with GeoSphere Austria involves comparing forecasts and exchanging pollen and weather data.
- We cooperate scientifically with the Sonnblick Observatory of GeoSphere Austria.