Wisconsin pollen and allergy seasons
Wisconsin has a spring tree season, grass in early summer, and a heavy ragweed season in the fall.
Twelve month pollen calendar
What is active in September
Cities in Wisconsin
No tracked cities yet for Wisconsin.
Today and worst today come from live readings where available. Typical shows the usual level for this month from the seasonal profile.
Pollen is only half of what's in the air. See today's air quality in Wisconsin for ozone, dust, and smoke readings by city.
The Wisconsin allergy season
Allergy levels in Wisconsin peak in September, when ragweed pollen runs highest. The season moves through tree pollen around April, grass in June, weed pollen such as ragweed in September. Levels start to climb around April. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in Wisconsin?
Pollen levels in Wisconsin usually begin climbing in April and reach their highest point in September.
What is the worst month for allergies in Wisconsin?
September is typically the worst month in Wisconsin, driven by ragweed pollen.
When does ragweed season end in Wisconsin?
Ragweed pollen in Wisconsin usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Wisconsin?
January usually brings the lowest pollen levels of the year in Wisconsin.