Pollen Zones
Pollen counts vary from region to region in the U.S. Use the pollen zone map to determine when tree, grass and weed pollens are at their worst in your area.
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Hide CaptionShow CaptionGreat Basin Pollen MapAll About
Trees: February to May
Grasses: March to October
Weeds: June to November
Grasses: March to October
Weeds: June to November
Find out which plants may be making you sneeze: Allergenic Plants
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