cottonwood pollen.
Populus deltoides · Tree
An early spring tree pollen from river valleys and the Plains.
Usual season in the US
February to April
Typical months; the stronger marks are the usual peak. Seasons shift with region, weather and year.
Where it grows
Cottonwoods line rivers and creeks across the Plains, the Midwest and the West.
Good to know
The white fluff that drifts in May and June is cottonwood seed, not pollen. The pollen comes earlier, in late winter and early spring, and you never see it.
In Sneezecast
Cottonwood 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:
Cottonwood 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
Alder
Juniper
Pine