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: Flower of pine tree 2026
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Pine tree flowers mainly in May and is one of the species responsible for the yellowish deposits found outdoors, known as "sulphur rain". However, from an allergological point of view pollen of pine is harmless.
Current pollination
LEGEND
Figure: flowering orchard grass (Dactylis glomerata): habitus (left) and macro photography of the spikelets (right).
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.
Increasing pollination from grasses - high pollination during the Pentecost weekend!
The fair weather of this week favors pollination from grasses again provoking an increase in grass pollen concentrations. High pollination from grasses is possible over the Pentecost weekend. Meanwhile, many allergological relevant grass species are in flower. Currently, false barley, brome grasses, orchard grass, oat grass and Kentucky Bluegrass flower.
Dock flowers as well on meadows.
Plantain has started flowering. It can be found in grass verges and on meadows.
Crop fields e.g. rye are flowering. Their pollen is not transported far due to its larger size. However, allergic symptoms may intensify in vicinity of flowering fields.
Fir, spruce and pine can release large quantities of pollen, which appears as a yellowish precipitate, known as sulphur rain, on outdoor surfaces. From an allergological point of view, however, this sulphur rain is harmless.
Pollination from oak and walnut is measurable, but decreasing.
Poplar wool is in the air, as can be observed locally. This is not pollen, but seed. It is harmless, although many connect it with their allergy because it occurs relatively concurrent with grass pollination.
Fungal spores were already measured. An increase to moderate values is expected during the course of this week.
Note for trips into the mountains: Grasses do not flower (that intense) in elevated regions, but the flower of green alder has started. This is reported by the Pollenwarndienst Salzburg of the University of Salzburg. Persons with an alder pollen allergy should avoid mid to high altitude regions.
Pollination profile
Grasses:
state of the flower: main pollination period/pollination
trend: increasing
time of the start of the flower: average
Fungal spores:
state of the season: main period/spore concentrations
trend: increasing
time of the start of the season: average
You can find the typical pollen seasons in our pollen calendar.
Pollen spectrum:
Pollen from spruce, pine, horse chestnut, the rush family, sedges, the rose family, cypress and yew is also in the air.
Current main allergen: Grasses
Grass pollen allergy is the most prevalent pollen allergy in Vienna!
Pollination time in Vienna: April to September; decorative grasses extend the pollination time into autumn!
Occurrence in Vienna: The sweet grass family (Poaceae) is prevalent and found nearly everywhere. Natural monuments, parks, the banks of the Danube and obviously all areas (meadows/lawns), that are mowed infrequently, are hot spots.
Who are “the grasses“?
There are many genera and species of relevance for persons concerned, especially because reactions to different taxa of the family are individual. Those grasses, that are of highest relevance for a grass pollen allergy, are mentioned in the following.
Bluegrass (Poa pratensis): flowers from April to June. It is sowed frequently for lawns and pastures.
Orchard grass (Dactylis glomerata): flowers from May to June. It occurs frequently (especially on meadows, roadsides, ruderal areas).
Falseoat-grass (Arrhenatherum elatius): flowers from May to July. Falseoat-grass prefers pastures and clearings.
Fescue grass (Festuca sp.): flowers from May to July. This genus is species-rich and prefers marshes like fine lawns, but also alluvial forests and roadsides.
Perennial rye grass (Lolium perenne): flowers from June to July. Perennial rye grass grows frequently on meadows and pastures and is used as pasture grass.
Timothy grass (Phleum pratense): flowers from June to September. Timothy grass is an allergologically famous gras but plays a minor role in Vienna due to its infrequent distribution. It prefers natural areas.
Bermuda grass (Cynodon dactylon): flowers from July to August. Bermuda grass is a neophyte in Europa and a light and heat indicator.
Cereals (cultivated rye, wheat and maize): Cereals belong as well to the sweet grass family. Grain fields in vicinity of Vienna may cause locally increased pollination, although cereal pollen is in general larger and thus not transported as far. Cultivated rye flowers usually from May to June, wheat from June to July and maize from July to August.
Cross-reactivity to pollen of other plants: Grass pollen is highly cross-reactive among pollen of other grasses
- 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.
- The Pollenservice Vienna is official partner of the Gesundheitsdienst (MA15) of the City of Vienna.