The Baton Rouge year in pollen
Pollen seasons in Baton Rouge: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around November 26.
Tree pollen
Grass
Ragweed
When does ragweed season end in Baton Rouge?
Ragweed season in Baton Rouge typically ends with the first frost, around November 26. Some years it comes as early as November 17, some as late as December 3.
A light frost around November 26 knocks the season down; the hard freeze that finishes it usually follows by December 11. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Baton Rouge pollen year
| Allergen | Typical season |
|---|---|
| Oak | February to May |
| Pine | February to April |
| Eastern red cedar | January to March |
| Pecan | April to May |
| Grass | April to September |
Season-by-season detail is on the Louisiana page.
Nearby calendars
Frost dates for Baton Rouge come from the Baton Rouge Ryan Airport weather station's 30-year records. Season windows reviewed August 2026.