Ragweed season

Ragweed is the main cause of fall allergies in the U.S. It blooms and releases pollen from August to November, and in ragweed season pollen levels are highest in the morning (ACAAI).

When is ragweed season?

Ragweed blooms and releases pollen from August to November. The season usually ends with the first hard frost where you live.

Tips for ragweed season

  • Start your allergy medicine about two weeks before your symptoms usually begin (ACAAI).
  • Keep windows and doors closed at home and in the car.
  • Plan outdoor time for later in the day, since ragweed pollen peaks in the morning.
  • Shower and change after spending time outside.

Medicines to compare

Antihistamine tablets and steroid nasal sprays are the two main over-the-counter options. Compare them on their labels: Zyrtec vs Claritin, Flonase and Nasacort, or use the medicine finder.

Sources

Not medical advice.

Frequently asked questions

When is ragweed season?

August to November in the U.S., according to the ACAAI.

What time of day is ragweed pollen highest?

In the morning, during late summer and fall.

More on allergy relief

Pollen season

Get ready before pollen season

A reminder before tree pollen season, when allergists suggest starting medicine, plus the ragweed season heads-up in August.

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