The Elko year in pollen
Pollen seasons in Elko: tree pollen February to June, grass April to October, and ragweed from early August until the first frost, around September 18.
First frost lands around September 18 in Elko — about 35 days earlier than Nevada overall — which shifts when ragweed season ends here.
When does ragweed season end in Elko?
Ragweed season in Elko typically ends with the first frost, around September 18. Some years it comes as early as September 12, some as late as September 24.
A light frost around September 18 knocks the season down; the hard freeze that finishes it usually follows by September 29. Based on 30 years of NOAA frost records (1991–2020).
The rest of the Elko pollen year
| Allergen | Typical season |
|---|---|
| Juniper | February to April |
| Mulberry | February to April |
| Ash | February to April |
| Olive | April to May |
| Mesquite | April to June |
| Grass | April to October |
Season-by-season detail is on the Nevada page.
Nearby calendars
Frost dates for Elko come from the Elko Regional Airport weather station's 30-year records. Season windows reviewed August 2026.