The McAllen year in pollen
Pollen seasons in McAllen: tree pollen December to May, grass March to October, and ragweed from early August until the first frost, around January 3.
First frost lands around January 3 in McAllen — about 35 days later than Texas overall — which shifts when ragweed season ends here.
Tree pollen
Grass
Ragweed
When does ragweed season end in McAllen?
Ragweed season in McAllen typically ends with the first frost, around January 3. Some years it comes as early as December 26, some as late as January 18.
The rest of the McAllen 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 McAllen come from the Mcallen Miller International Airport weather station's 30-year records. Season windows reviewed August 2026.