Montana frost dates: J
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | frost any month | 5a | ||
| Jefferson City | Jun 18 | Sep 5 | 79 d | 4b |
| Joliet | May 29 | Sep 15 | 109 d | 5a |
| Joplin | May 21 | Sep 19 | 121 d | 4a |
| Jordan | May 21 | Sep 18 | 120 d | 4a |
| Judith Gap | Jun 1 | Sep 15 | 106 d | 4b |
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Jackson | frost any month | 5a | ||
| Jefferson City | Jun 18 | Sep 5 | 79 d | 4b |
| Joliet | May 29 | Sep 15 | 109 d | 5a |
| Joplin | May 21 | Sep 19 | 121 d | 4a |
| Jordan | May 21 | Sep 18 | 120 d | 4a |
| Judith Gap | Jun 1 | Sep 15 | 106 d | 4b |