Ohio frost dates: N
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Nankin | Apr 30 | Oct 15 | 168 d | 6a |
| Napoleon | Apr 23 | Oct 24 | 184 d | 6a |
| Nashport | Apr 26 | Oct 19 | 176 d | 6a |
| Nashville | May 2 | Oct 14 | 165 d | 6a |
| Navarre | Apr 24 | Oct 26 | 185 d | 6b |
| Neapolis | Apr 22 | Oct 24 | 185 d | 6a |
| Neffs | Apr 20 | Oct 29 | 192 d | 6b |
| Negley | Apr 28 | Oct 26 | 181 d | 6b |
| Nelsonville | Apr 30 | Oct 14 | 167 d | 6b |
| Nevada | Apr 29 | Oct 17 | 171 d | 6a |
| Neville | Apr 16 | Oct 31 | 198 d | 7a |
| New Albany | Apr 18 | Oct 27 | 192 d | 6a |
| New Athens | Apr 21 | Oct 25 | 187 d | 6b |
| New Bavaria | Apr 23 | Oct 24 | 184 d | 6a |
| New Bloomington | Apr 25 | Oct 20 | 178 d | 6a |
| New Bremen | Apr 27 | Oct 19 | 175 d | 6a |
| New Carlisle | Apr 24 | Oct 17 | 176 d | 6a |
| New Concord | Apr 28 | Oct 17 | 172 d | 6b |
| New Hampshire | Apr 22 | Oct 27 | 188 d | 6a |
| New Haven | Apr 25 | Oct 25 | 183 d | 6a |
| New Holland | Apr 23 | Oct 21 | 181 d | 6b |
| New Knoxville | Apr 27 | Oct 19 | 175 d | 6a |
| New Lebanon | Apr 18 | Oct 25 | 190 d | 6a |
| New Lexington | Apr 30 | Oct 17 | 170 d | 6a |
| New London | Apr 27 | Oct 22 | 178 d | 6a |
| New Madison | Apr 21 | Oct 20 | 182 d | 6a |
| New Marshfield | Apr 25 | Oct 23 | 181 d | 6b |
| New Matamoras | Apr 23 | Oct 26 | 186 d | 6b |
| New Middletown | Apr 30 | Oct 23 | 176 d | 6a |
| New Paris | Apr 24 | Oct 20 | 179 d | 6a |
| New Philadelphia | Apr 30 | Oct 15 | 168 d | 6b |
| New Plymouth | Apr 30 | Oct 14 | 167 d | 6b |
| New Richmond | Apr 16 | Oct 31 | 198 d | 6b |
| New Riegel | Apr 23 | Oct 23 | 183 d | 6a |
| New Rumley | Apr 21 | Oct 25 | 187 d | 6b |
| New Springfield | Apr 30 | Oct 23 | 176 d | 6a |
| New Straitsville | Apr 30 | Oct 14 | 167 d | 6a |
| New Vienna | Apr 24 | Oct 20 | 179 d | 6b |
| New Washington | Apr 19 | Oct 27 | 191 d | 6a |
| New Waterford | May 2 | Oct 13 | 164 d | 6a |
| New Weston | Apr 21 | Oct 20 | 182 d | 6a |
| Newark | Apr 29 | Oct 16 | 170 d | 6a |
| Newbury | May 5 | Oct 18 | 166 d | 6a |
| Newcomerstown | Apr 18 | Oct 28 | 193 d | 6b |
| Newport | Apr 23 | Oct 26 | 186 d | 6b |
| Newton Falls | May 8 | Oct 12 | 157 d | 6a |
| Newtonsville | Apr 23 | Oct 18 | 178 d | 6b |
| Ney | Apr 26 | Oct 17 | 174 d | 6a |
| Niles | May 8 | Oct 12 | 157 d | 6a |
| North Baltimore | Apr 24 | Oct 21 | 180 d | 6a |
| North Bend | Apr 16 | Oct 28 | 195 d | 6b |
| North Benton | Apr 21 | Oct 29 | 191 d | 6a |
| North Bloomfield | Apr 30 | Oct 23 | 176 d | 6a |
| North Canton | Apr 24 | Oct 26 | 185 d | 6b |
| North Fairfield | Apr 25 | Oct 25 | 183 d | 6a |
| North Georgetown | May 2 | Oct 13 | 164 d | 6a |
| North Hampton | Apr 24 | Oct 17 | 176 d | 6a |
| North Jackson | May 8 | Oct 12 | 157 d | 6a |
| North Kingsville | May 2 | Oct 21 | 172 d | 6b |
| North Lawrence | Apr 24 | Oct 26 | 185 d | 6b |
| North Lewisburg | Apr 26 | Oct 20 | 177 d | 6a |
| North Lima | Apr 30 | Oct 23 | 176 d | 6a |
| North Olmsted | Apr 20 | Nov 3 | 197 d | 6b |
| North Ridgeville | Apr 22 | Nov 1 | 193 d | 6b |
| North Robinson | Apr 26 | Oct 20 | 177 d | 6a |
| North Royalton | Apr 20 | Nov 3 | 197 d | 6b |
| North Star | Apr 21 | Oct 20 | 182 d | 6a |
| Northfield | Apr 30 | Oct 21 | 174 d | 6b |
| Northwood | Apr 20 | Oct 27 | 190 d | 6b |
| Norwalk | Apr 25 | Oct 25 | 183 d | 6a |
| Norwich | Apr 26 | Oct 19 | 176 d | 6b |
| Nova | Apr 30 | Oct 15 | 168 d | 6a |
| Novelty | Apr 26 | Oct 31 | 188 d | 6a |