Wisconsin frost dates: N
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Nashotah | Apr 30 | Oct 12 | 165 d | 5b |
| Necedah | May 17 | Sep 25 | 131 d | 4b |
| Neenah | May 4 | Oct 6 | 155 d | 5b |
| Neillsville | May 10 | Oct 1 | 144 d | 4b |
| Nekoosa | May 8 | Oct 1 | 146 d | 4b |
| Nelson | Apr 28 | Oct 14 | 169 d | 4b |
| Nelsonville | May 4 | Oct 7 | 156 d | 5a |
| Neopit | May 13 | Sep 30 | 140 d | 4b |
| Neosho | Apr 28 | Oct 10 | 165 d | 5a |
| Neshkoro | May 3 | Oct 5 | 155 d | 5a |
| New Auburn | May 5 | Oct 3 | 151 d | 4b |
| New Berlin | May 3 | Oct 14 | 164 d | 5b |
| New Franken | May 7 | Oct 9 | 155 d | 5b |
| New Glarus | Apr 27 | Oct 14 | 170 d | 5a |
| New Holstein | May 1 | Oct 14 | 166 d | 5b |
| New Lisbon | May 2 | Oct 7 | 158 d | 4b |
| New London | May 4 | Oct 6 | 155 d | 5a |
| New Munster | May 5 | Oct 9 | 157 d | 5b |
| New Richmond | May 6 | Oct 2 | 149 d | 4b |
| Newburg | May 4 | Oct 11 | 160 d | 5b |
| Newton | Apr 30 | Oct 20 | 173 d | 5b |
| Niagara | May 17 | Oct 1 | 137 d | 4b |
| Nichols | May 4 | Oct 6 | 155 d | 5a |
| North Freedom | Apr 24 | Oct 20 | 179 d | 5a |
| North Lake | Apr 30 | Oct 12 | 165 d | 5b |
| North Prairie | May 3 | Oct 9 | 159 d | 5b |
| Norwalk | May 6 | Oct 3 | 150 d | 5a |