The Youngstown year in pollen
Pollen seasons in Youngstown: tree pollen February to May, grass May to July, and ragweed from early August until the first frost, around October 17.
First frost lands around October 17 in Youngstown — about 10 days earlier than Ohio overall — which shifts when ragweed season ends here.
When does ragweed season end in Youngstown?
Ragweed season in Youngstown typically ends with the first frost, around October 17. Some years it comes as early as October 10, some as late as October 24.
A light frost around October 17 knocks the season down; the hard freeze that finishes it usually follows by November 1. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Youngstown pollen year
| Allergen | Typical season |
|---|---|
| Oak | April to May |
| Maple | March to April |
| Elm | February to April |
| Birch | April to May |
| Ash | April to May |
| Hickory and walnut | April to May |
| Grass | May to July |
Season-by-season detail is on the Ohio page.
Nearby calendars
Frost dates for Youngstown come from the Youngstown Regional Airport weather station's 30-year records. Season windows reviewed August 2026.