The Charleston year in pollen
Pollen seasons in Charleston: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around December 30.
First frost lands around December 30 in Charleston — about 41 days later than South Carolina overall — which shifts when ragweed season ends here.
When does ragweed season end in Charleston?
Ragweed season in Charleston typically ends with the first frost, around December 30. Some years it comes as early as December 20, some as late as January 9.
A light frost around December 30 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 Charleston 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 South Carolina page.
Nearby calendars
Frost dates for Charleston come from the Charleston City weather station's 30-year records. Season windows reviewed August 2026.