The Honolulu year in pollen
Pollen seasons in Honolulu: tree pollen March to October, grass January to December, and ragweed from early August, fading out by late December.
Tree pollen
Grass
Ragweed
When does ragweed season end in Honolulu?
Ragweed around Honolulu winds down on its own through late December — most winters never bring a season-ending freeze.
The rest of the Honolulu pollen year
| Allergen | Typical season |
|---|---|
| Kiawe (mesquite) | March to October |
| Grass | January to December |
Season-by-season detail is on the Hawaii page.
Nearby calendars
Frost dates for Honolulu come from the Honolulu International Airport weather station's 30-year records. Season windows reviewed August 2026.