Connecticut frost dates: W
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Wallingford | Apr 18 | Oct 26 | 191 d | 6b |
| Washington | Apr 20 | Oct 20 | 183 d | 6a |
| Washington Depot | Apr 20 | Oct 20 | 183 d | 6a |
| Waterbury | Apr 26 | Oct 16 | 173 d | 6b |
| Waterford | Apr 16 | Oct 28 | 195 d | 7a |
| Watertown | Apr 25 | Oct 18 | 176 d | 6b |
| Wauregan | Apr 30 | Oct 15 | 168 d | 6b |
| Weatogue | Apr 25 | Oct 18 | 176 d | 6b |
| West Cornwall | May 11 | Oct 4 | 146 d | 6a |
| West Granby | Apr 30 | Oct 17 | 170 d | 6a |
| West Hartford | Apr 17 | Oct 26 | 192 d | 6b |
| West Hartland | Apr 30 | Oct 17 | 170 d | 6a |
| West Haven | Apr 17 | Oct 27 | 193 d | 7a |
| West Mystic | Apr 8 | Nov 2 | 208 d | 7a |
| West Simsbury | Apr 30 | Oct 17 | 170 d | 6b |
| West Suffield | Apr 21 | Oct 16 | 178 d | 6b |
| Westbrook | Apr 6 | Nov 17 | 225 d | 7a |
| Weston | Apr 17 | Oct 23 | 189 d | 7a |
| Westport | Apr 17 | Oct 23 | 189 d | 7a |
| Wethersfield | Apr 17 | Oct 26 | 192 d | 6b |
| Willimantic | Apr 28 | Oct 13 | 168 d | 6b |
| Willington | May 7 | Oct 12 | 158 d | 6b |
| Wilton | Apr 17 | Oct 23 | 189 d | 7a |
| Winchester Center | May 3 | Oct 11 | 161 d | 6a |
| Windham | Apr 28 | Oct 13 | 168 d | 6b |
| Windsor | Apr 21 | Oct 16 | 178 d | 6b |
| Windsor Locks | Apr 21 | Oct 16 | 178 d | 6b |
| Winsted | Apr 30 | Oct 17 | 170 d | 6a |
| Wolcott | Apr 26 | Oct 16 | 173 d | 6b |
| Woodbury | Apr 20 | Oct 20 | 183 d | 6b |
| Woodstock | May 1 | Oct 9 | 161 d | 6b |
| Woodstock Valley | Apr 25 | Oct 13 | 171 d | 6b |