North Dakota frost dates: K
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Karlsruhe | May 12 | Sep 27 | 138 d | 4a |
| Kathryn | May 13 | Sep 26 | 136 d | 4a |
| Keene | May 20 | Sep 20 | 123 d | 4a |
| Kenmare | May 15 | Sep 23 | 131 d | 4a |
| Kensal | May 11 | Sep 28 | 140 d | 4a |
| Killdeer | May 21 | Sep 23 | 125 d | 4a |
| Kindred | May 4 | Oct 2 | 151 d | 4a |
| Kintyre | May 13 | Sep 28 | 138 d | 4a |
| Knox | May 15 | Sep 27 | 135 d | 4a |
| Kramer | May 15 | Sep 25 | 133 d | 3b |
| Kulm | May 7 | Oct 2 | 148 d | 4b |