Frost dates in Benton County, Washington
The average last spring frost in Benton County falls Mar 24 to Apr 14 and the average first fall frost Oct 21 to Nov 4, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 7b. Places: Benton City, Finley, Kennewick, Prosser, Richland, Sunnyside. 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 |
|---|---|---|---|---|
| 98944 | Sunnyside | Mar 24 | Nov 4 | 7b |
| 99320 | Benton City | Apr 6 | Oct 24 | 7b |
| 99336 | Kennewick | Mar 28 | Oct 30 | 7b |
| 99337 | Finley | Mar 28 | Oct 30 | 7b |
| 99338 | Kennewick | Mar 28 | Oct 30 | 7b |
| 99345 | Apr 14 | Oct 21 | 7b | |
| 99346 | Mar 27 | Nov 4 | 7b | |
| 99350 | Prosser | Apr 14 | Oct 22 | 7b |
| 99352 | Richland | Apr 6 | Oct 24 | 7b |
| 99353 | West Richland | Apr 6 | Oct 24 | 7b |
| 99354 | Richland | Apr 6 | Oct 24 | 7b |
Nearby counties
Franklin County Walla Walla County Yakima County Adams County Columbia County Grant County
All Washington counties · Download Washington frost dates (CSV)
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