The Brownsville year in pollen
Pollen seasons in Brownsville: tree pollen December to May, grass March to October, and ragweed from early August until the first frost, around January 2.
First frost lands around January 2 in Brownsville — about 34 days later than Texas overall — which shifts when ragweed season ends here.
Tree pollen
Grass
Ragweed
When does ragweed season end in Brownsville?
Ragweed season in Brownsville typically ends with the first frost, around January 2. Some years it comes as early as December 24, some as late as January 9.
The rest of the Brownsville pollen year
| Allergen | Typical season |
|---|---|
| Mountain cedar (Ashe juniper) | December to February |
| Oak (live oak) | March to May |
| Elm | February to April |
| Cedar elm (fall) | August to October |
| Pecan | April to May |
| Cottonwood | March to April |
| Grass | March to October |
Season-by-season detail is on the Texas page.
Nearby calendars
Frost dates for Brownsville come from the Brownsville weather station's 30-year records. Season windows reviewed August 2026.