Iowa frost dates: K
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Kalona | Apr 21 | Oct 18 | 180 d | 5b |
| Kamrar | May 3 | Oct 2 | 152 d | 5a |
| Kanawha | Apr 29 | Oct 7 | 161 d | 5a |
| Kellerton | Apr 16 | Oct 20 | 187 d | 5b |
| Kelley | Apr 26 | Oct 8 | 165 d | 5b |
| Kellogg | Apr 22 | Oct 17 | 178 d | 5b |
| Kensett | May 4 | Oct 4 | 153 d | 5a |
| Keokuk | Apr 10 | Oct 27 | 200 d | 6a |
| Keosauqua | Apr 26 | Oct 13 | 170 d | 5b |
| Keota | Apr 24 | Oct 15 | 174 d | 5b |
| Kesley | Apr 27 | Oct 8 | 164 d | 5a |
| Keswick | Apr 24 | Oct 15 | 174 d | 5b |
| Keystone | Apr 28 | Oct 10 | 165 d | 5a |
| Killduff | Apr 22 | Oct 17 | 178 d | 5b |
| Kimballton | May 2 | Oct 3 | 154 d | 5b |
| Kingsley | Apr 30 | Oct 4 | 157 d | 5a |
| Kirkman | Apr 27 | Oct 9 | 165 d | 5a |
| Kirkville | Apr 23 | Oct 14 | 174 d | 5b |
| Kiron | Apr 27 | Oct 11 | 167 d | 5a |
| Klemme | Apr 29 | Oct 7 | 161 d | 5a |
| Knierim | Apr 26 | Oct 10 | 167 d | 5a |
| Knoxville | Apr 20 | Oct 19 | 182 d | 5b |