Pennsylvania frost dates: K
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Kane | May 24 | Sep 28 | 127 d | 5b |
| Kantner | May 6 | Oct 12 | 159 d | 6a |
| Karns City | May 7 | Oct 14 | 160 d | 6a |
| Karthaus | May 21 | Sep 27 | 129 d | 6a |
| Keisterville | Apr 30 | Oct 18 | 171 d | 6b |
| Kelayres | Apr 30 | Oct 22 | 175 d | 6b |
| Kelton | Apr 19 | Oct 26 | 190 d | 7a |
| Kemblesville | Apr 7 | Nov 2 | 209 d | 7a |
| Kempton | Apr 26 | Oct 14 | 171 d | 6b |
| Kennerdell | May 2 | Oct 23 | 174 d | 6a |
| Kennett Square | Apr 19 | Oct 26 | 190 d | 7a |
| Kent | May 8 | Oct 13 | 158 d | 6b |
| Kersey | May 13 | Oct 11 | 151 d | 5b |
| Kimberton | Apr 18 | Oct 27 | 192 d | 7a |
| King Of Prussia | Apr 8 | Oct 31 | 206 d | 7a |
| Kingsley | May 14 | Oct 2 | 141 d | 6a |
| Kingston | Apr 23 | Oct 20 | 180 d | 6b |
| Kintnersville | Apr 29 | Oct 16 | 170 d | 6b |
| Kinzers | Apr 14 | Nov 1 | 201 d | 7a |
| Kirkwood | Apr 26 | Oct 22 | 179 d | 7a |
| Kittanning | May 4 | Oct 16 | 165 d | 6b |
| Kleinfeltersville | Apr 20 | Oct 25 | 188 d | 7a |
| Klingerstown | Apr 27 | Oct 20 | 176 d | 6b |
| Knox | May 9 | Oct 11 | 155 d | 6a |
| Knox Dale | May 6 | Oct 14 | 161 d | 6a |
| Knoxville | May 14 | Oct 5 | 144 d | 5b |
| Koppel | Apr 27 | Oct 25 | 181 d | 6b |
| Kossuth | May 9 | Oct 11 | 155 d | 6a |
| Kreamer | Apr 27 | Oct 16 | 172 d | 6b |
| Kresgeville | Apr 21 | Oct 23 | 185 d | 6b |
| Kulpmont | Apr 27 | Oct 20 | 176 d | 6b |
| Kulpsville | Apr 24 | Oct 15 | 174 d | 7a |
| Kunkletown | Apr 21 | Oct 23 | 185 d | 6b |
| Kutztown | Apr 26 | Oct 14 | 171 d | 6b |
| Kylertown | May 13 | Oct 1 | 141 d | 6a |