The Wilmington year in pollen
Pollen seasons in Wilmington: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around November 20.
First frost lands around November 20 in Wilmington — about 16 days later than North Carolina overall — which shifts when ragweed season ends here.
When does ragweed season end in Wilmington?
Ragweed season in Wilmington typically ends with the first frost, around November 20. Some years it comes as early as November 13, some as late as November 27.
A light frost around November 20 knocks the season down; the hard freeze that finishes it usually follows by December 3. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Wilmington 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 North Carolina page.
Nearby calendars
Frost dates for Wilmington come from the Wilmington International Airport weather station's 30-year records. Season windows reviewed August 2026.