Frost dates in Union County, Oregon
The average last spring frost in Union County falls May 6 to May 24 and the average first fall frost Sep 18 to Oct 1, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 6b. Places: Cove, Elgin, Imbler, La Grande, North Powder, Summerville. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 97824 | Cove | May 11 | Sep 26 | 6b |
| 97827 | Elgin | May 24 | Sep 18 | 6b |
| 97841 | Imbler | May 24 | Sep 18 | 6b |
| 97850 | La Grande | May 6 | Oct 1 | 6b |
| 97867 | North Powder | May 11 | Sep 26 | 6b |
| 97876 | Summerville | May 24 | Sep 18 | 6b |
| 97883 | Union | May 11 | Sep 26 | 6b |
Nearby counties
Wallowa County Baker County Umatilla County Grant County Morrow County Wheeler County
All Oregon counties · Download Oregon frost dates (CSV)
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