Michigan frost dates: W
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Wakefield | May 19 | Sep 28 | 132 d | 4a |
| Waldron | May 4 | Oct 7 | 156 d | 6a |
| Walhalla | May 17 | Oct 7 | 143 d | 6a |
| Walkerville | May 17 | Oct 1 | 137 d | 5b |
| Wallace | May 22 | Sep 27 | 128 d | 5a |
| Walled Lake | May 1 | Oct 17 | 169 d | 6a |
| Walloon Lake | May 16 | Oct 9 | 146 d | 5b |
| Warren | Apr 21 | Oct 31 | 193 d | 6b |
| Washington | Apr 26 | Oct 22 | 179 d | 6a |
| Waterford | Apr 29 | Oct 20 | 174 d | 6a |
| Waters | May 12 | Oct 7 | 148 d | 5a |
| Watersmeet | May 31 | Sep 19 | 111 d | 4b |
| Watervliet | May 5 | Oct 15 | 163 d | 6a |
| Watton | May 25 | Sep 25 | 123 d | 4b |
| Wayland | May 4 | Oct 15 | 164 d | 6a |
| Wayne | Apr 20 | Oct 27 | 190 d | 6b |
| Webberville | May 4 | Oct 7 | 156 d | 6a |
| Weidman | Apr 30 | Oct 20 | 173 d | 5b |
| Wells | May 13 | Oct 7 | 147 d | 5a |
| Wellston | May 28 | Sep 25 | 120 d | 5b |
| West Bloomfield | Apr 29 | Oct 20 | 174 d | 6a |
| West Branch | May 15 | Oct 4 | 142 d | 5a |
| West Olive | Apr 27 | Oct 25 | 181 d | 6b |
| Westland | Apr 20 | Oct 27 | 190 d | 6b |
| Weston | May 4 | Oct 7 | 156 d | 6a |
| Westphalia | May 3 | Oct 12 | 162 d | 6a |
| Wetmore | May 16 | Oct 14 | 151 d | 4b |
| Wheeler | May 1 | Oct 13 | 165 d | 6a |
| White Cloud | May 8 | Oct 11 | 156 d | 5b |
| White Lake | May 10 | Oct 6 | 149 d | 6a |
| White Pigeon | Apr 30 | Oct 17 | 170 d | 6a |
| White Pine | May 26 | Sep 27 | 124 d | 4b |
| Whitehall | May 19 | Oct 4 | 138 d | 6b |
| Whitmore Lake | May 5 | Oct 13 | 161 d | 6a |
| Whittaker | May 3 | Oct 10 | 160 d | 6a |
| Whittemore | May 23 | Sep 26 | 126 d | 5a |
| Williamsburg | May 12 | Oct 16 | 157 d | 6a |
| Williamston | Apr 28 | Oct 17 | 172 d | 6a |
| Willis | May 3 | Oct 10 | 160 d | 6a |
| Wilson | May 13 | Oct 7 | 147 d | 5a |
| Winn | Apr 30 | Oct 20 | 173 d | 5b |
| Wixom | May 6 | Oct 12 | 159 d | 6a |
| Wolverine | Jun 7 | Sep 14 | 99 d | 4b |
| Woodland | May 3 | Oct 12 | 162 d | 6a |
| Wyandotte | May 1 | Oct 15 | 167 d | 6b |
| Wyoming | May 6 | Oct 10 | 157 d | 6a |