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Giant Ragweed Pollen

Weeds

The largest ragweed species, growing up to 5 metres. Found in floodplains and agricultural areas of North America. Highly allergenic.

Season August to October
Peak September

In a typical year, Giant Ragweed Pollen season runs August to October, peaking around September.

No tracked city is currently reporting measurable Giant Ragweed Pollen, which is typical when it is out of season.

Giant Ragweed Pollen season by country

Typical windows from our country pollen calendars; the weather shifts them earlier or later each year.

CountrySeasonPeak
JapanAug–OctAug–Sep
United StatesJul–OctAug–Sep