The Provo year in pollen
Pollen seasons in Provo: tree pollen March to June, grass May to July, and ragweed from early August until the first frost, around October 31.
First frost lands around October 31 in Provo — about 9 days later than Utah overall — which shifts when ragweed season ends here.
When does ragweed season end in Provo?
Ragweed season in Provo typically ends with the first frost, around October 31. Some years it comes as early as October 25, some as late as November 5.
A light frost around October 31 knocks the season down; the hard freeze that finishes it usually follows by November 10. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Provo pollen year
| Allergen | Typical season |
|---|---|
| Juniper | March to May |
| Cottonwood and aspen | March to May |
| Maple (boxelder) | March to May |
| Birch and alder | April to May |
| Pine | May to June |
| Grass | May to July |
Season-by-season detail is on the Utah page.
Nearby calendars
Frost dates for Provo come from the Salt Lake City International Airport weather station's 30-year records. Season windows reviewed August 2026.