The Tri-Cities year in pollen
Pollen seasons in Tri-Cities: tree pollen January to May, grass April to September, and ragweed from early August until the first frost, around October 24.
First frost lands around October 24 in Tri-Cities — about 10 days earlier than Tennessee overall — which shifts when ragweed season ends here.
When does ragweed season end in Tri-Cities?
Ragweed season in Tri-Cities typically ends with the first frost, around October 24. Some years it comes as early as October 18, some as late as October 29.
A light frost around October 24 knocks the season down; the hard freeze that finishes it usually follows by November 1. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Tri-Cities pollen year
| Allergen | Typical season |
|---|---|
| Oak | March to May |
| Pine | March to May |
| Eastern red cedar | January to March |
| Maple | February to April |
| Birch | March to April |
| Hickory | April to May |
| Grass | April to September |
Season-by-season detail is on the Tennessee page.
Nearby calendars
Frost dates for Tri-Cities come from the Bristol Tri City Airport weather station's 30-year records. Season windows reviewed August 2026.