The Fort Wayne year in pollen
Pollen seasons in Fort Wayne: tree pollen February to May, grass May to July, and ragweed from early August until the first frost, around October 21.
Tree pollen
Grass
Ragweed
When does ragweed season end in Fort Wayne?
Ragweed season in Fort Wayne typically ends with the first frost, around October 21. Some years it comes as early as October 16, some as late as October 25.
A light frost around October 21 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 Fort Wayne 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 Indiana page.
Nearby calendars
Frost dates for Fort Wayne come from the Ft Wayne International Airport weather station's 30-year records. Season windows reviewed August 2026.