The Fort Smith year in pollen
Pollen seasons in Fort Smith: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around November 6.
Tree pollen
Grass
Ragweed
When does ragweed season end in Fort Smith?
Ragweed season in Fort Smith typically ends with the first frost, around November 6. Some years it comes as early as November 1, some as late as November 13.
A light frost around November 6 knocks the season down; the hard freeze that finishes it usually follows by November 17. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Fort Smith pollen year
| Allergen | Typical season |
|---|---|
| Oak | February to May |
| Pine | February to April |
| Eastern red cedar | January to March |
| Pecan | April to May |
| Grass | April to September |
Season-by-season detail is on the Arkansas page.
Nearby calendars
Frost dates for Fort Smith come from the Ft Smith Regional Airport weather station's 30-year records. Season windows reviewed August 2026.