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 purple alder 2026
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The purple alder usually begins to flower during Christmas week. Due to its hybridization between Japanese and Caucasian alder, the tree copes well with lower temperatures and can release pollen even at just above 0°C. Due to the persistent cold weather in January, pollen release during the main flowering period was delayed until the end of January.
Current pollination
LEGEND
Figure: : flowering catkins of common hazel (Corylus avellana, bottom right), of Turkish hazel (Corylus colurna, bottom left) and of grey alder (Alnus incana, top left) as well as catkins ready to flower of black alder (Alnus glutinosa, top 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.
Break from pollen before the approaching full flower of hazel and alder!
Common hazel and Turkish hazel, the latter one planted as urban tree in Vienna, are in flower. Gray alder flowers and black alder has reached readiness to flower and will soon start to flower. The flower of Spaeth´s alder is fading.
Weather causes a break from pollen due to a cold front and snow. A warm front arrives during the weekend, that will bring mild weather in the week of the 23rd of February. Pollination will increase rapidly and the full flower of hazel and alder will be reached at temperatures of or above 10°C and sunshine. Thus, high pollination and a peak in pollen concentrations is already foreseeable.
Pollen spectrum: Pollen from cypress and yew is also in the air.
Note: Cypress and yew are a rare allergen in Austria, with cypress being more allergenic than yew. Their pollen cannot be distinguished in the light microscopy routine.
Current main allergen: Hazel
Pollination time in Vienna: January to April
Occurrence in Vienna: frequently distributed in parks, gardens or planted as ornamental plant (corkscrew hazel)
Who is “the hazel“?
There are two species of relevance in Vienna.
Turkish hazel (Corylus colurna): This species is a tree unlike the common hazel, that is a shrub. It is often planted in European cities, because it is robust and tolerates urban conditions.
Common hazel (Corylus avellana): It is a shrub and prefers forest edges and field hedges.
Cross-reactivity to pollen of other plants: alder, birch and hornbeam
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