The North Platte year in pollen
Pollen seasons in North Platte: tree pollen February to May, grass May to August, and ragweed from early August until the first frost, around October 1.
First frost lands around October 1 in North Platte — about 12 days earlier than Nebraska overall — which shifts when ragweed season ends here.
When does ragweed season end in North Platte?
Ragweed season in North Platte typically ends with the first frost, around October 1. Some years it comes as early as September 25, some as late as October 6.
A light frost around October 1 knocks the season down; the hard freeze that finishes it usually follows by October 10. Based on 30 years of NOAA frost records (1991–2020).
The rest of the North Platte 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 North Platte come from the North Platte Regional Airport weather station's 30-year records. Season windows reviewed August 2026.