The Charleston year in pollen
Pollen seasons in Charleston: tree pollen March to June, grass May to July, and ragweed from early August until the first frost, around October 26.
Tree pollen
Grass
Ragweed
When does ragweed season end in Charleston?
Ragweed season in Charleston typically ends with the first frost, around October 26. Some years it comes as early as October 21, some as late as October 31.
A light frost around October 26 knocks the season down; the hard freeze that finishes it usually follows by November 5. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Charleston pollen year
| Allergen | Typical season |
|---|---|
| Oak | March to May |
| Maple | March to April |
| Birch | March to May |
| Ash | March to April |
| Pine | April to June |
| Grass | May to July |
Season-by-season detail is on the West Virginia page.
Nearby calendars
Frost dates for Charleston come from the Charleston Yeager Airport weather station's 30-year records. Season windows reviewed August 2026.