The New Orleans year in pollen
Pollen seasons in New Orleans: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around January 2.
First frost lands around January 2 in New Orleans — about 37 days later than Louisiana overall — which shifts when ragweed season ends here.
When does ragweed season end in New Orleans?
Ragweed season in New Orleans typically ends with the first frost, around January 2. Some years it comes as early as December 23, some as late as January 11.
A light frost around January 2 knocks the season down; the hard freeze that finishes it usually follows by January 8. Based on 30 years of NOAA frost records (1991–2020).
The rest of the New Orleans 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 New Orleans come from the New Orleans Audubon weather station's 30-year records. Season windows reviewed August 2026.