birch pollen.
Betula · Tree
An early spring tree pollen, strongest in the Northeast and the upper Midwest.
Usual season in the US
March to May
Typical months; the stronger marks are the usual peak. Seasons shift with region, weather and year.
Where it grows
Birches are most common in the northern states, from New England through the Great Lakes, and in gardens and parks well beyond them.
Good to know
Birch season is short and intense: a few weeks in April for most places. It often overlaps with oak and maple, which is one reason a diary helps tell them apart.
In Sneezecast
Birch 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:
Birch 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
Maple
Grasses
Elm
Ash
Alder
Cottonwood
Pine