The Morgantown year in pollen
Pollen seasons in Morgantown: tree pollen March to June, grass May to July, and ragweed from early August until the first frost, around October 24.
Tree pollen
Grass
Ragweed
When does ragweed season end in Morgantown?
Ragweed season in Morgantown typically ends with the first frost, around October 24. Some years it comes as early as October 18, some as late as October 29.
A light frost around October 24 knocks the season down; the hard freeze that finishes it usually follows by November 4. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Morgantown 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 Morgantown come from the Morgantown Hart Field weather station's 30-year records. Season windows reviewed August 2026.