Wisconsin frost dates: W
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Wabeno | May 19 | Sep 29 | 133 d | 4b |
| Waldo | May 3 | Oct 16 | 166 d | 5b |
| Wales | May 1 | Oct 13 | 165 d | 5b |
| Walworth | Apr 28 | Oct 14 | 169 d | 5b |
| Warrens | May 6 | Oct 3 | 150 d | 4b |
| Wascott | May 22 | Sep 26 | 127 d | 3b |
| Washburn | May 23 | Oct 2 | 132 d | 4b |
| Washington Island | May 15 | Oct 14 | 152 d | 6a |
| Waterford | May 5 | Oct 10 | 158 d | 5b |
| Waterloo | Apr 30 | Oct 9 | 162 d | 5b |
| Watertown | Apr 28 | Oct 12 | 167 d | 5a |
| Waukau | May 1 | Oct 11 | 163 d | 5a |
| Waukesha | May 1 | Oct 13 | 165 d | 5b |
| Waunakee | May 1 | Oct 10 | 162 d | 5a |
| Waupaca | May 8 | Oct 6 | 151 d | 5a |
| Waupun | May 1 | Oct 11 | 163 d | 5a |
| Wausau | May 6 | Oct 4 | 151 d | 4b |
| Wausaukee | May 22 | Sep 27 | 128 d | 4b |
| Wautoma | May 10 | Oct 3 | 146 d | 5a |
| Wauzeka | Apr 22 | Oct 20 | 181 d | 5a |
| Webster | May 11 | Sep 30 | 142 d | 4a |
| West Bend | May 1 | Oct 12 | 164 d | 5b |
| West Salem | Apr 27 | Oct 13 | 169 d | 5a |
| Westboro | May 23 | Sep 23 | 123 d | 4a |
| Westby | May 7 | Oct 2 | 148 d | 5a |
| Westfield | May 3 | Oct 5 | 155 d | 5a |
| Weyauwega | May 8 | Oct 6 | 151 d | 5a |
| Weyerhaeuser | May 9 | Sep 29 | 143 d | 4a |
| Wheeler | May 10 | Sep 29 | 142 d | 4b |
| White Lake | May 22 | Sep 28 | 129 d | 4b |
| Whitehall | May 9 | Oct 1 | 145 d | 4b |
| Whitelaw | Apr 30 | Oct 20 | 173 d | 5b |
| Whitewater | May 2 | Oct 9 | 160 d | 5b |
| Wild Rose | May 8 | Oct 6 | 151 d | 5a |
| Willard | May 10 | Oct 1 | 144 d | 4b |
| Williams Bay | Apr 25 | Oct 21 | 179 d | 5b |
| Wilmot | Apr 23 | Oct 21 | 181 d | 5b |
| Wilson | May 6 | Oct 2 | 149 d | 4b |
| Wilton | May 6 | Oct 3 | 150 d | 5a |
| Windsor | May 1 | Oct 10 | 162 d | 5a |
| Winnebago | Apr 24 | Oct 20 | 179 d | 5b |
| Winneconne | Apr 24 | Oct 20 | 179 d | 5b |
| Winter | May 19 | Sep 27 | 131 d | 4a |
| Wisconsin Dells | May 8 | Oct 3 | 148 d | 5a |
| Wisconsin Rapids | May 8 | Oct 1 | 146 d | 4b |
| Withee | May 13 | Sep 26 | 136 d | 4a |
| Wittenberg | May 6 | Oct 5 | 152 d | 4b |
| Wonewoc | May 5 | Oct 4 | 152 d | 5a |
| Woodford | Apr 27 | Oct 14 | 170 d | 5a |
| Woodland | Apr 28 | Oct 10 | 165 d | 5a |
| Woodman | Apr 22 | Oct 20 | 181 d | 5a |
| Woodruff | May 23 | Sep 27 | 127 d | 4b |
| Woodville | May 6 | Oct 2 | 149 d | 4b |
| Woodworth | Apr 28 | Oct 19 | 174 d | 5b |
| Wrightstown | May 6 | Oct 6 | 153 d | 5b |
| Wyocena | Apr 28 | Oct 10 | 165 d | 5a |