The Topeka year in pollen
Pollen seasons in Topeka: tree pollen February to May, grass May to August, and ragweed from early August until the first frost, around October 23.
Tree pollen
Grass
Ragweed
When does ragweed season end in Topeka?
Ragweed season in Topeka typically ends with the first frost, around October 23. Some years it comes as early as October 19, some as late as October 28.
A light frost around October 23 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 Topeka pollen year
| Allergen | Typical season |
|---|---|
| Eastern red cedar | February to April |
| Elm | February to April |
| Maple | March to April |
| Oak | April to May |
| Cottonwood | April to May |
| Grass | May to August |
Season-by-season detail is on the Kansas page.
Nearby calendars
Frost dates for Topeka come from the Topeka Municipal Airport weather station's 30-year records. Season windows reviewed August 2026.