The Oklahoma City year in pollen
Pollen seasons in Oklahoma City: tree pollen February to May, grass May to August, and ragweed from early August until the first frost, around November 2.
Tree pollen
Grass
Ragweed
When does ragweed season end in Oklahoma City?
Ragweed season in Oklahoma City typically ends with the first frost, around November 2. Some years it comes as early as October 29, some as late as November 8.
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 Oklahoma City 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 Oklahoma page.
Nearby calendars
Frost dates for Oklahoma City come from the Oklahoma City Will Rogers Airport weather station's 30-year records. Season windows reviewed August 2026.