The Lansing year in pollen
Pollen seasons in Lansing: tree pollen March to June, grass May to July, and ragweed from mid-August until the first frost, around October 13.
First frost lands around October 13 in Lansing — about 7 days earlier than Michigan overall — which shifts when ragweed season ends here.
When does ragweed season end in Lansing?
Ragweed season in Lansing typically ends with the first frost, around October 13. Some years it comes as early as October 6, some as late as October 19.
A light frost around October 13 knocks the season down; the hard freeze that finishes it usually follows by October 27. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Lansing pollen year
| Allergen | Typical season |
|---|---|
| Birch | April to May |
| Oak | April to June |
| Maple | March to May |
| Alder | March to April |
| Ash | April to May |
| Pine | May to June |
| Grass | May to July |
Season-by-season detail is on the Michigan page.
Nearby calendars
Frost dates for Lansing come from the Lansing Capital City Airport weather station's 30-year records. Season windows reviewed August 2026.