Oregon frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jacksonville | May 4 | Oct 13 | 162 d | 8a |
| Jamieson | Apr 23 | Oct 13 | 173 d | 6b |
| Jefferson | Mar 29 | Nov 6 | 222 d | 8b |
| John Day | May 28 | Sep 18 | 113 d | 6b |
| Jordan Valley | Jun 11 | Sep 10 | 91 d | 6b |
| Joseph | May 24 | Oct 1 | 130 d | 6a |
| Junction City | Apr 11 | Oct 23 | 195 d | 8b |
| Juntura | Jun 5 | Sep 5 | 92 d | 6a |