Oregon frost dates: A
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Adams | May 12 | Sep 27 | 138 d | 7a |
| Adel | May 26 | Oct 1 | 128 d | 6b |
| Adrian | Apr 24 | Oct 9 | 168 d | 7a |
| Agness | Mar 30 | Nov 17 | 232 d | 9a |
| Albany | Apr 17 | Oct 28 | 194 d | 8b |
| Allegany | Feb 21 | Dec 9 | 291 d | 9a |
| Alsea | Apr 13 | Nov 3 | 204 d | 8b |
| Alvadore | Apr 11 | Oct 23 | 195 d | 8b |
| Amity | Apr 15 | Oct 26 | 194 d | 8b |
| Antelope | May 22 | Oct 3 | 134 d | 7a |
| Arch Cape | Apr 2 | Nov 12 | 224 d | 9a |
| Arlington | Apr 6 | Oct 21 | 198 d | 7b |
| Arock | Jun 11 | Sep 10 | 91 d | 6b |
| Ashland | May 6 | Oct 8 | 155 d | 8a |
| Ashwood | May 22 | Oct 3 | 134 d | 7a |
| Astoria | Mar 26 | Nov 11 | 230 d | 8b |
| Athena | Mar 25 | Oct 29 | 218 d | 7a |
| Aumsville | Mar 29 | Nov 6 | 222 d | 8b |
| Aurora | Mar 16 | Nov 14 | 243 d | 8b |
| Azalea | Mar 31 | Nov 6 | 220 d | 8b |