Montana frost dates: E
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| East Glacier Park | Jun 8 | Sep 5 | 89 d | 4b |
| East Helena | May 9 | Sep 30 | 144 d | 5a |
| Edgar | May 29 | Sep 15 | 109 d | 5a |
| Ekalaka | May 20 | Sep 23 | 126 d | 4b |
| Elliston | Jun 9 | Sep 8 | 91 d | 4b |
| Elmo | May 15 | Sep 28 | 136 d | 6a |
| Emigrant | May 21 | Sep 27 | 129 d | 5a |
| Ennis | Jun 16 | Sep 4 | 80 d | 5a |
| Essex | May 9 | Oct 1 | 145 d | 5a |
| Ethridge | May 24 | Sep 15 | 114 d | 4a |
| Eureka | May 11 | Sep 27 | 139 d | 5a |