The Fairbanks year in pollen
Pollen seasons in Fairbanks: tree pollen April to June, grass June to August, and no ragweed to speak of.
First frost lands around September 13 in Fairbanks — about 16 days earlier than Alaska overall — which shifts when ragweed season ends here.
Tree pollen
Grass
When does ragweed season end in Fairbanks?
Fairbanks has no real ragweed season.
The rest of the Fairbanks pollen year
| Allergen | Typical season |
|---|---|
| Birch | April to June |
| Alder | April to June |
| Cottonwood and aspen | May to June |
| Grass | June to August |
Season-by-season detail is on the Alaska page.
Nearby calendars
Frost dates for Fairbanks come from the Fairbanks International Airport weather station's 30-year records. Season windows reviewed August 2026.