alder pollen.
Alnus · Tree
One of the year’s first pollens, in late winter, especially in the Pacific Northwest.
Usual season in the US
January to April
Typical months; the stronger marks are the usual peak. Seasons shift with region, weather and year.
Where it grows
Alders grow along streams and wet ground, most of all in the Pacific Northwest and the northern states.
Good to know
Alder is a close relative of birch and flowers weeks earlier, so its season can open the year.
In Sneezecast
Alder is in the five-day forecast for your area whenever it’s in season. Star it if you know it gets you, and the morning verdict follows it:
Alder high — your top trigger. Take your usual allergy medicine before you head out.
Not sure it’s yours? Log how each evening felt in two taps. After ten logged days, Sneezecast compares your diary with the pollen and ranks what moves your symptoms. How it learns
Oak
Birch
Maple
Elm
Ash
Cottonwood
Juniper
Pine