Alder Pollen
TreesOne of the earliest tree pollens of the year. Alder trees are common near water and produce catkins that release large quantities of pollen in late winter and early spring.
In a typical year, Alder Pollen season runs January to April, peaking around February to March.
No tracked city is currently reporting measurable Alder Pollen, which is typical when it is out of season.
Alder Pollen season by country
Typical windows from our country pollen calendars; the weather shifts them earlier or later each year.
| Country | Season | Peak |
|---|---|---|
| Germany | Jan–Apr | Feb–Mar |
| Japan | Jan–Jun | Mar–Apr |
| United Kingdom | Jan–Apr | Feb–Mar |
About Alder Pollen
Alder is among the first tree pollens of the year in much of Europe, arriving alongside hazel, and together the two are often the first sign that the allergy season has started. Common alder grows along rivers, lakes and in wet woodland, and its catkins can open in January in a mild winter. Its major allergen, Aln g 1, is closely related to the birch allergen Bet v 1. Most people who react to alder therefore also react to birch and hazel, and the three together make up the early-spring tree season.
The alder season typically runs from January or February into March or April, peaking in February and March, and it moves earlier after a warm winter. Because it overlaps hazel and precedes birch by a few weeks, symptoms that start in late winter and run straight into April are usually this trio at work.