Indiana pollen and allergy seasons
Indiana has a spring tree season and a heavy ragweed season in late summer and early fall.
Twelve month pollen calendar
What is active in September
Cities in Indiana
No tracked cities yet for Indiana.
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 Indiana for ozone, dust, and smoke readings by city.
The Indiana allergy season
Allergy levels in Indiana 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 March. The lowest pollen levels of the year arrive in January.
Common questions
When does allergy season start in Indiana?
Pollen levels in Indiana usually begin climbing in March and reach their highest point in September.
What is the worst month for allergies in Indiana?
September is typically the worst month in Indiana, driven by ragweed pollen.
When does ragweed season end in Indiana?
Ragweed pollen in Indiana usually fades by the end of October, after the first hard frost in colder areas.
When is the best time for allergies in Indiana?
January usually brings the lowest pollen levels of the year in Indiana.