oak pollen.
Quercus · Tree
A spring tree pollen, released from long, dangling catkins from March into May.
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
Oaks grow across almost all of the US, from the Southeast through the Midwest to California, so oak season reaches most people somewhere in spring. It starts earliest in the South.
Good to know
Oaks put out a lot of pollen over several weeks, and a windy, dry day after rain can carry the most. The catkins are the yellow-green strings you see dropping onto cars and sidewalks.
In Sneezecast
Oak 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:
Oak 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
Birch
Maple
Grasses
Elm
Ash
Alder
Cottonwood
Pine