The Kansas City year in pollen
Pollen seasons in Kansas City: tree pollen February to May, grass May to July, and ragweed from early August until the first frost, around November 2.
First frost lands around November 2 in Kansas City — about 4 days later than Missouri overall — which shifts when ragweed season ends here.
When does ragweed season end in Kansas City?
Ragweed season in Kansas City typically ends with the first frost, around November 2. Some years it comes as early as October 29, some as late as November 7.
A light frost around November 2 knocks the season down; the hard freeze that finishes it usually follows by November 11. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Kansas City 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 Missouri page.
Nearby calendars
Frost dates for Kansas City come from the Kansas City Downtown Airport weather station's 30-year records. Season windows reviewed August 2026.