The Oxnard year in pollen
Pollen seasons in Oxnard: tree pollen January to June, grass March to July, and ragweed from early August, fading out by late November.
Unlike most of California, Oxnard rarely sees a real frost, so ragweed fades out rather than stopping cold.
Tree pollen
Grass
Ragweed
When does ragweed season end in Oxnard?
Ragweed around Oxnard winds down on its own through late November — most winters never bring a season-ending freeze.
The rest of the Oxnard pollen year
| Allergen | Typical season |
|---|---|
| Oak | March to May |
| Cypress and juniper | January to March |
| Alder | January to March |
| Olive | April to June |
| Walnut | April to May |
| Grass | March to July |
Season-by-season detail is on the California page.
Nearby calendars
Frost dates for Oxnard come from the Oxnard Ventura Co Airport weather station's 30-year records. Season windows reviewed August 2026.