Connecticut frost dates: B
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Ballouville | May 1 | Oct 9 | 161 d | 6b |
| Baltic | Apr 14 | Oct 24 | 193 d | 6b |
| Bantam | May 8 | Oct 5 | 150 d | 6a |
| Barkhamsted | Apr 30 | Oct 17 | 170 d | 6a |
| Beacon Falls | Apr 25 | Oct 17 | 175 d | 6b |
| Berlin | Apr 26 | Oct 16 | 173 d | 6b |
| Bethany | Apr 18 | Oct 26 | 191 d | 6b |
| Bethel | Apr 20 | Oct 20 | 183 d | 6b |
| Bethlehem | May 8 | Oct 5 | 150 d | 6a |
| Bloomfield | Apr 21 | Oct 16 | 178 d | 6b |
| Bolton | Apr 19 | Oct 22 | 186 d | 6b |
| Botsford | Apr 25 | Oct 17 | 175 d | 6b |
| Bozrah | Apr 14 | Oct 24 | 193 d | 6b |
| Branford | Apr 17 | Oct 27 | 193 d | 7a |
| Bridgeport | Apr 5 | Nov 6 | 215 d | 7a |
| Bridgewater | Apr 20 | Oct 20 | 183 d | 6b |
| Bristol | Apr 25 | Oct 18 | 176 d | 6b |
| Broad Brook | Apr 21 | Oct 16 | 178 d | 6b |
| Brookfield | Apr 20 | Oct 20 | 183 d | 6b |
| Brooklyn | Apr 30 | Oct 15 | 168 d | 6b |
| Burlington | Apr 25 | Oct 18 | 176 d | 6a |