ragweed pollen.
Ambrosia · Weed
The classic late-summer weed pollen, from mid-August until the first frost.
Usual season in the US
Mid-August to the first frost
Typical months; the stronger marks are the usual peak. Seasons shift with region, weather and year.
Where it grows
Ragweed grows in nearly every state and is most abundant in the Midwest and the East. Its light pollen carries far on the wind.
Good to know
Ragweed season usually peaks in early to mid September and ends with the first hard frost, which is why fall can feel like a second allergy season.
In Sneezecast
Ragweed 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:
Ragweed 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
