Ohio frost dates: K
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Kalida | Apr 23 | Oct 22 | 182 d | 6a |
| Kansas | Apr 21 | Oct 24 | 186 d | 6a |
| Keene | Apr 18 | Oct 28 | 193 d | 6b |
| Kelleys Island | Apr 10 | Nov 5 | 209 d | 7a |
| Kensington | May 2 | Oct 13 | 164 d | 6a |
| Kent | Apr 21 | Oct 29 | 191 d | 6a |
| Kenton | Apr 22 | Oct 24 | 185 d | 6a |
| Kerr | Apr 18 | Oct 28 | 193 d | 6b |
| Kettlersville | Apr 27 | Oct 20 | 176 d | 6a |
| Kidron | Apr 24 | Oct 21 | 180 d | 6a |
| Kilbourne | Apr 22 | Oct 24 | 185 d | 6b |
| Killbuck | May 2 | Oct 14 | 165 d | 6a |
| Kimbolton | Apr 28 | Oct 17 | 172 d | 6b |
| Kings Mills | Apr 23 | Oct 18 | 178 d | 6b |
| Kingston | Apr 20 | Oct 22 | 185 d | 6b |
| Kingsville | May 2 | Oct 21 | 172 d | 6b |
| Kinsman | May 4 | Oct 14 | 163 d | 6a |
| Kipling | Apr 28 | Oct 17 | 172 d | 6b |
| Kipton | Apr 27 | Oct 22 | 178 d | 6b |
| Kirby | Apr 29 | Oct 17 | 171 d | 6a |
| Kirkersville | Apr 22 | Oct 18 | 179 d | 6a |
| Kitts Hill | Apr 22 | Oct 23 | 184 d | 7a |
| Kunkle | Apr 28 | Oct 18 | 173 d | 6a |