Frost dates in Johnson County, Iowa
The average last spring frost in Johnson County falls Apr 21 to Apr 29 and the average first fall frost Oct 9 to Oct 18, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 5a to 5b. Places: Coralville, Hills, Iowa City, Kalona, Lone Tree, North Liberty. 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 |
|---|---|---|---|---|
| 52235 | Hills | Apr 29 | Oct 9 | 5b |
| 52240 | Iowa City | Apr 29 | Oct 9 | 5b |
| 52241 | Coralville | Apr 21 | Oct 18 | 5b |
| 52242 | Iowa City | Apr 21 | Oct 18 | 5b |
| 52245 | Iowa City | Apr 21 | Oct 18 | 5b |
| 52246 | Iowa City | Apr 21 | Oct 18 | 5b |
| 52247 | Kalona | Apr 21 | Oct 18 | 5b |
| 52317 | North Liberty | Apr 27 | Oct 11 | 5b |
| 52322 | Oxford | Apr 21 | Oct 18 | 5b |
| 52333 | Solon | Apr 21 | Oct 18 | 5b |
| 52338 | Shueyville | Apr 27 | Oct 11 | 5a |
| 52340 | Tiffin | Apr 21 | Oct 18 | 5b |
| 52755 | Lone Tree | Apr 29 | Oct 9 | 5b |
Nearby counties
Washington County Iowa County Cedar County Muscatine County Linn County Louisa County
All Iowa counties · Download Iowa frost dates (CSV)
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