Pennsylvania frost dates: A
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Aaronsburg | May 5 | Oct 6 | 154 d | 6b |
| Abbottstown | Apr 27 | Oct 18 | 174 d | 7a |
| Abington | Apr 11 | Nov 1 | 204 d | 7b |
| Acme | Apr 30 | Oct 17 | 170 d | 6a |
| Acosta | May 6 | Oct 12 | 159 d | 6a |
| Adah | Apr 28 | Oct 21 | 176 d | 7a |
| Adamsburg | Apr 22 | Oct 25 | 186 d | 6b |
| Adamstown | Apr 26 | Oct 19 | 176 d | 7a |
| Adamsville | May 4 | Oct 14 | 163 d | 6a |
| Addison | Apr 30 | Oct 18 | 171 d | 6a |
| Adrian | May 10 | Oct 12 | 155 d | 6b |
| Airville | Apr 1 | Nov 10 | 223 d | 7a |
| Akron | Apr 18 | Oct 25 | 190 d | 7a |
| Alba | May 16 | Oct 2 | 139 d | 6a |
| Albion | May 8 | Oct 16 | 161 d | 6a |
| Albrightsville | Apr 21 | Oct 23 | 185 d | 6a |
| Alburtis | Apr 26 | Oct 14 | 171 d | 6b |
| Aleppo | May 4 | Oct 12 | 161 d | 6a |
| Alexandria | Apr 19 | Oct 28 | 192 d | 6b |
| Aliquippa | Apr 28 | Oct 26 | 181 d | 6b |
| Allenport | Apr 13 | Nov 5 | 206 d | 6b |
| Allensville | Apr 21 | Oct 24 | 186 d | 6b |
| Allentown | Apr 20 | Oct 24 | 187 d | 7a |
| Allenwood | Apr 25 | Oct 24 | 182 d | 6b |
| Allison | Apr 30 | Oct 18 | 171 d | 6b |
| Allison Park | Apr 24 | Oct 27 | 186 d | 6b |
| Allport | May 13 | Oct 1 | 141 d | 6a |
| Altoona | Apr 25 | Oct 21 | 179 d | 6b |
| Alum Bank | May 4 | Oct 10 | 159 d | 6b |
| Alverda | May 17 | Oct 2 | 138 d | 6a |
| Alverton | May 1 | Oct 13 | 165 d | 6b |
| Amberson | Apr 19 | Oct 24 | 188 d | 6b |
| Ambler | Apr 11 | Nov 1 | 204 d | 7a |
| Ambridge | Apr 8 | Nov 8 | 214 d | 6b |
| Amity | Apr 24 | Oct 23 | 182 d | 6b |
| Analomink | May 1 | Oct 12 | 164 d | 6b |
| Andreas | Apr 21 | Oct 23 | 185 d | 6b |
| Anita | May 6 | Oct 14 | 161 d | 6a |
| Annville | Apr 20 | Oct 25 | 188 d | 7a |
| Antes Fort | Apr 30 | Oct 20 | 173 d | 6b |
| Apollo | Apr 29 | Oct 20 | 174 d | 6b |
| Aquashicola | Apr 21 | Oct 23 | 185 d | 7a |
| Arcadia | May 10 | Oct 5 | 148 d | 6a |
| Archbald | Apr 23 | Oct 20 | 180 d | 6a |
| Ardara | Apr 22 | Oct 25 | 186 d | 6b |
| Ardmore | Mar 30 | Nov 17 | 232 d | 7b |
| Arendtsville | Apr 15 | Oct 27 | 195 d | 7a |
| Aristes | Apr 27 | Oct 20 | 176 d | 6b |
| Armagh | May 8 | Oct 13 | 158 d | 6b |
| Armbrust | May 1 | Oct 13 | 165 d | 6b |
| Arnot | May 10 | Oct 5 | 148 d | 6a |
| Arona | May 1 | Oct 13 | 165 d | 6b |
| Artemas | Apr 27 | Oct 17 | 173 d | 7a |
| Ashfield | Apr 21 | Oct 23 | 185 d | 6b |
| Ashland | Apr 27 | Oct 20 | 176 d | 6b |
| Ashville | Apr 25 | Oct 21 | 179 d | 6b |
| Aspers | Apr 15 | Oct 27 | 195 d | 7a |
| Aston | Mar 30 | Nov 16 | 231 d | 7b |
| Atglen | Apr 19 | Oct 25 | 189 d | 7a |
| Athens | May 6 | Oct 10 | 157 d | 6a |
| Atlantic | Apr 30 | Oct 23 | 176 d | 6a |
| Atlasburg | Apr 29 | Oct 20 | 174 d | 6b |
| Auburn | Apr 16 | Oct 25 | 192 d | 7a |
| Audubon | Apr 24 | Oct 15 | 174 d | 7a |
| Aultman | May 8 | Oct 13 | 158 d | 6b |
| Austin | May 22 | Oct 1 | 132 d | 5b |
| Avella | Apr 29 | Oct 20 | 174 d | 6b |
| Avis | Apr 30 | Oct 20 | 173 d | 6b |
| Avondale | Apr 19 | Oct 26 | 190 d | 7a |
| Avonmore | Apr 29 | Oct 20 | 174 d | 6b |