The Lexington year in pollen
Pollen seasons in Lexington: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around October 28.
Tree pollen
Grass
Ragweed
When does ragweed season end in Lexington?
Ragweed season in Lexington typically ends with the first frost, around October 28. Some years it comes as early as October 23, some as late as November 1.
A light frost around October 28 knocks the season down; the hard freeze that finishes it usually follows by November 6. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Lexington pollen year
| Allergen | Typical season |
|---|---|
| Oak | March to May |
| Pine | March to May |
| Eastern red cedar | January to March |
| Maple | February to April |
| Birch | March to April |
| Hickory | April to May |
| Grass | April to September |
Season-by-season detail is on the Kentucky page.
Nearby calendars
Frost dates for Lexington come from the Lexington Bluegrass Airport weather station's 30-year records. Season windows reviewed August 2026.