The Lafayette year in pollen
Pollen seasons in Lafayette: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around December 4.
First frost lands around December 4 in Lafayette — about 8 days later than Louisiana overall — which shifts when ragweed season ends here.
When does ragweed season end in Lafayette?
Ragweed season in Lafayette typically ends with the first frost, around December 4. Some years it comes as early as November 26, some as late as December 16.
A light frost around December 4 knocks the season down; the hard freeze that finishes it usually follows by December 30. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Lafayette 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 Lafayette come from the Lafayette Regional Airport weather station's 30-year records. Season windows reviewed August 2026.