The Florence year in pollen
Pollen seasons in Florence: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around November 13.
First frost lands around November 13 in Florence — about 6 days earlier than South Carolina overall — which shifts when ragweed season ends here.
When does ragweed season end in Florence?
Ragweed season in Florence typically ends with the first frost, around November 13. Some years it comes as early as November 8, some as late as November 21.
A light frost around November 13 knocks the season down; the hard freeze that finishes it usually follows by November 27. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Florence 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 Florence come from the Florence Regional Airport weather station's 30-year records. Season windows reviewed August 2026.