The Burlington year in pollen
Pollen seasons in Burlington: tree pollen March to June, grass May to July, and ragweed from mid-August until the first frost, around October 15.
First frost lands around October 15 in Burlington — about 12 days later than Vermont overall — which shifts when ragweed season ends here.
When does ragweed season end in Burlington?
Ragweed season in Burlington typically ends with the first frost, around October 15. Some years it comes as early as October 9, some as late as October 22.
A light frost around October 15 knocks the season down; the hard freeze that finishes it usually follows by October 28. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Burlington pollen year
| Allergen | Typical season |
|---|---|
| Maple | March to April |
| Birch | April to May |
| Oak | April to June |
| Ash | April to May |
| Pine | May to June |
| Grass | May to July |
Season-by-season detail is on the Vermont page.
Nearby calendars
Frost dates for Burlington come from the Burlington International Airport weather station's 30-year records. Season windows reviewed August 2026.