Pollen Alert at the Vienna Marathon 2025: Main Bloom of Birch and Ash Expected

Allergy sufferers must expect birch pollen at the Vienna City Marathon this coming Sunday. The birch reaches its peak blooming period over the weekend. The ash and, to a certain extent, the hornbeam also play a role.

Birch and Ash Blooming: Pollen Warning for Vienna City Marathon 2025

The birch, which is typically the main allergen for April, has only begun to bloom hesitantly this year due to unstable weather, but will have reached its peak blooming period by the marathon weekend, meaning pollen can definitely be expected. In spring-like weather conditions without precipitation, birch pollen concentrations could already be very high in Vienna during the marathon weekend 2025.

The ash has begun to bloom according to the long-term average and is above average in intensity this year. Even though some of the ashes have already completed their blooming and the peak blooming period is nearing its end, pollen can still be expected during the marathon weekend.

Cross-Reactions Can Intensify Allergic Symptoms

Another plant with allergenic potential currently playing a role in the pollen count is the hornbeam. As a member of the birch family, it is closely related to hazel, alder, and birch, and can additionally irritate allergy sufferers who are sensitized to birch pollen. The hornbeam has already reached higher pollen concentrations than usual by the end of March and is also currently in its peak blooming period.

No Trace of Grasses and Other Cross-Allergens at Vienna Marathon 2025

Due to the recurring cold spells and this year's early date of the Vienna City Marathon, no additional allergenic pollen is expected in the air. Oak, beech, and plane trees have not yet begun to bloom, and grasses will not be an issue during the race weekend. The blooming period of early bloomers hazel and alder has already ended.

Detailed Pollen Forecast for Marathon Runners

The Pollen Service Vienna of MedUni Vienna is once again offering a detailed pollen forecast for the Vienna City Marathon this year, along with tips and tricks for preparation before, during, and after the race. Additionally, informative graphics with schematic representations of the increased occurrence of relevant allergenic plants along the race route are available, which have been created in collaboration with the VCM team.

An update of the pollen forecast will be provided on Thursday, April 3, 2025, on www.pollenservice.wien, to address details and the predicted weather conditions.

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