The Omaha year in pollen
Pollen seasons in Omaha: tree pollen February to May, grass May to August, and ragweed from early August until the first frost, around October 21.
First frost lands around October 21 in Omaha — about 8 days later than Nebraska overall — which shifts when ragweed season ends here.
When does ragweed season end in Omaha?
Ragweed season in Omaha typically ends with the first frost, around October 21. Some years it comes as early as October 15, some as late as October 26.
A light frost around October 21 knocks the season down; the hard freeze that finishes it usually follows by October 30. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Omaha 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 Nebraska page.
Nearby calendars
Frost dates for Omaha come from the Omaha Eppley Airfield weather station's 30-year records. Season windows reviewed August 2026.