Allergy Clinical Services

Pollen and Molds

Molds

Pollen and Mold Counts

Limiting Pollen and Mold Exposure

Season
Pollen source Season
Trees, e.g., birch, elm, oak March to April or May
Grasses, e.g., bluegrass, orchard, fescue May until mid-July
Ragweed and other weeds, e.g., cocklebur, plantain Late summer and early fall

Geographic location

Some pollens can be found in almost all states while others are found only in certain regions of the country. Moving may temporarily improve allergy symptoms if the pollens are different in the new location, but many people who move will develop allergies to the new pollens within one to two years.

Reviewed: Paulette Taylor, RN, CPN, AE-C
Date: February 2009

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