Louisville, KY Ragweed Pollen
Ragweed pollen in Louisville usually peaks around September, reaching Very High at its worst. Louisville sits in the Ohio River Valley, where humid air and river bottoms make for a heavy allergy year: maple and oak in spring, grass in summer, and a strong ragweed fall.
Ragweed peaks in September along the river bottoms around Louisville.
Ragweed in Louisville today
Monday, July 27, 2026
Ragweed pollen by month in Louisville
How ragweed usually runs across the year. The current month is outlined.
Managing ragweed season in Louisville
If ragweed is your trigger, start a daily antihistamine like cetirizine (Zyrtec) or loratadine (Claritin) a week or two before the September peak, rather than waiting for symptoms. Keep windows closed on high-count mornings, shower and change clothes after time outside, and run the AC on recirculate in the car.
When symptoms don't ease with over-the-counter medicine, an allergist in Kentucky can test whether ragweed is really what you react to and talk through longer-term options like allergy shots.
Sources
More pollen in Louisville
- Louisville grass pollen — peaks May to June.
- Louisville oak pollen — peaks April.
- Louisville maple pollen — peaks March.
- Louisville pollen calendar — every allergen, month by month.
- Louisville pollen count today — live tree, grass, and weed levels with a 5-day forecast.
- Kentucky pollen season — the statewide calendar and other cities.
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Sign up for free alertsSeasonal pattern based on Kentucky pollen data and local sources. Today's reading updated daily. MyPollenPal