The Scranton year in pollen
Pollen seasons in Scranton: tree pollen March to June, grass May to July, and ragweed from mid-August until the first frost, around October 20.
First frost lands around October 20 in Scranton — about 8 days earlier than Pennsylvania overall — which shifts when ragweed season ends here.
When does ragweed season end in Scranton?
Ragweed season in Scranton typically ends with the first frost, around October 20. Some years it comes as early as October 13, some as late as October 26.
A light frost around October 20 knocks the season down; the hard freeze that finishes it usually follows by November 3. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Scranton pollen year
| Allergen | Typical season |
|---|---|
| Maple | March to April |
| Birch | April to May |
| Oak | April to June |
| Ash | April to May |
| Pine | May to June |
| Grass | May to July |
Season-by-season detail is on the Pennsylvania page.
Nearby calendars
Frost dates for Scranton come from the Wilkes-Barre International Airport weather station's 30-year records. Season windows reviewed August 2026.