Wisconsin frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| La Crosse | Apr 27 | Oct 13 | 169 d | 5a |
| La Farge | Apr 27 | Oct 14 | 170 d | 4b |
| La Pointe | May 20 | Oct 9 | 142 d | 5b |
| La Valle | May 2 | Oct 7 | 158 d | 5a |
| Lac Du Flambeau | May 23 | Sep 27 | 127 d | 4a |
| Ladysmith | May 27 | Sep 22 | 118 d | 4a |
| Lake Delton | May 8 | Oct 3 | 148 d | 5a |
| Lake Geneva | Apr 25 | Oct 21 | 179 d | 5b |
| Lake Mills | Apr 29 | Oct 14 | 168 d | 5b |
| Lake Nebagamon | May 24 | Sep 26 | 125 d | 4a |
| Lake Tomahawk | May 19 | Oct 3 | 137 d | 4a |
| Lakewood | May 22 | Sep 28 | 129 d | 4b |
| Lancaster | Apr 27 | Oct 11 | 167 d | 5a |
| Land O Lakes | May 25 | Sep 24 | 122 d | 4a |
| Lannon | Apr 30 | Oct 16 | 169 d | 5b |
| Laona | May 19 | Sep 29 | 133 d | 4b |
| Larsen | May 4 | Oct 6 | 155 d | 5b |
| Lebanon | Apr 28 | Oct 10 | 165 d | 5a |
| Lena | May 9 | Oct 6 | 150 d | 5a |
| Leopolis | May 13 | Sep 30 | 140 d | 5a |
| Lime Ridge | May 2 | Oct 7 | 158 d | 5a |
| Linden | May 3 | Oct 7 | 157 d | 5a |
| Little Chute | May 4 | Oct 6 | 155 d | 5b |
| Little Suamico | May 9 | Oct 6 | 150 d | 5b |
| Livingston | Apr 30 | Oct 13 | 166 d | 5a |
| Lodi | May 1 | Oct 10 | 162 d | 5a |
| Loganville | Apr 24 | Oct 20 | 179 d | 5a |
| Lomira | Apr 27 | Oct 19 | 175 d | 5a |
| Lone Rock | Apr 30 | Oct 9 | 162 d | 5a |
| Long Lake | Jun 4 | Sep 10 | 98 d | 4b |
| Lowell | May 2 | Oct 9 | 160 d | 5b |
| Loyal | May 10 | Oct 1 | 144 d | 4b |
| Lublin | May 13 | Sep 26 | 136 d | 4a |
| Luck | May 6 | Oct 4 | 151 d | 4b |
| Luxemburg | May 1 | Oct 18 | 170 d | 5b |
| Lyndon Station | May 8 | Oct 3 | 148 d | 5a |
| Lynxville | Apr 24 | Oct 17 | 176 d | 5a |
| Lyons | Apr 25 | Oct 21 | 179 d | 5b |