The Juneau year in pollen
Pollen seasons in Juneau: tree pollen April to June, grass June to August, and no ragweed to speak of.
First frost lands around October 3 in Juneau — about 4 days later than Alaska overall — which shifts when ragweed season ends here.
Tree pollen
Grass
When does ragweed season end in Juneau?
Juneau has no real ragweed season.
The rest of the Juneau 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 Juneau come from the Juneau International Airport weather station's 30-year records. Season windows reviewed August 2026.