Iowa frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| La Motte | Apr 28 | Oct 11 | 166 d | 5a |
| La Porte City | May 3 | Oct 3 | 153 d | 5a |
| Lacona | May 5 | Oct 5 | 153 d | 5b |
| Ladora | Apr 28 | Oct 10 | 165 d | 5a |
| Lake City | Apr 26 | Oct 10 | 167 d | 5a |
| Lake Mills | Apr 30 | Oct 7 | 160 d | 5a |
| Lake Park | Apr 30 | Oct 10 | 163 d | 5a |
| Lake View | Apr 30 | Oct 6 | 159 d | 5a |
| Lakota | May 4 | Oct 1 | 150 d | 5a |
| Lamoni | Apr 17 | Oct 21 | 187 d | 5b |
| Lamont | May 4 | Oct 1 | 150 d | 5a |
| Lanesboro | Apr 27 | Oct 10 | 166 d | 5a |
| Langworthy | May 1 | Oct 4 | 156 d | 5a |
| Lansing | May 2 | Oct 11 | 162 d | 5a |
| Larchwood | May 2 | Oct 2 | 153 d | 5a |
| Larrabee | May 4 | Oct 4 | 153 d | 5a |
| Latimer | Apr 29 | Oct 9 | 163 d | 5a |
| Laurel | Apr 28 | Oct 7 | 162 d | 5b |
| Laurens | Apr 30 | Oct 5 | 158 d | 5a |
| Lawler | May 2 | Oct 5 | 156 d | 5a |
| Lawton | Apr 29 | Oct 7 | 161 d | 5a |
| Le Claire | Apr 16 | Oct 25 | 192 d | 5b |
| Le Grand | Apr 28 | Oct 7 | 162 d | 5a |
| Le Mars | Apr 30 | Oct 4 | 157 d | 5a |
| Ledyard | May 4 | Oct 1 | 150 d | 5a |
| Lehigh | May 3 | Oct 2 | 152 d | 5a |
| Leighton | Apr 21 | Oct 16 | 178 d | 5b |
| Leland | Apr 30 | Oct 7 | 160 d | 5a |
| Lenox | Apr 27 | Oct 12 | 168 d | 5b |
| Leon | Apr 30 | Oct 8 | 161 d | 5b |
| Lester | May 1 | Oct 4 | 156 d | 5a |
| Letts | Apr 26 | Oct 10 | 167 d | 5b |
| Lewis | Apr 30 | Oct 2 | 155 d | 5b |
| Liberty Center | Apr 24 | Oct 12 | 171 d | 5b |
| Libertyville | Apr 27 | Oct 12 | 168 d | 5b |
| Lidderdale | Apr 27 | Oct 10 | 166 d | 5a |
| Lime Springs | May 8 | Oct 1 | 146 d | 4b |
| Lincoln | Apr 29 | Oct 9 | 163 d | 5a |
| Linden | May 2 | Oct 3 | 154 d | 5a |
| Lineville | Apr 21 | Oct 19 | 181 d | 5b |
| Linn Grove | Apr 30 | Oct 5 | 158 d | 5a |
| Lisbon | Apr 27 | Oct 13 | 169 d | 5a |
| Liscomb | Apr 30 | Oct 6 | 159 d | 5a |
| Little Cedar | Apr 30 | Oct 9 | 162 d | 5a |
| Little Rock | May 5 | Oct 3 | 151 d | 5a |
| Little Sioux | May 1 | Oct 3 | 155 d | 5a |
| Livermore | Apr 26 | Oct 12 | 169 d | 5a |
| Lockridge | Apr 27 | Oct 12 | 168 d | 5b |
| Logan | Apr 29 | Oct 8 | 162 d | 5b |
| Lohrville | Apr 26 | Oct 10 | 167 d | 5a |
| Lone Rock | Apr 30 | Oct 6 | 159 d | 5a |
| Lone Tree | Apr 29 | Oct 9 | 163 d | 5b |
| Long Grove | Apr 21 | Oct 17 | 179 d | 5b |
| Lorimor | Apr 30 | Oct 3 | 156 d | 5b |
| Lost Nation | Apr 27 | Oct 10 | 166 d | 5a |
| Lovilia | Apr 24 | Oct 16 | 175 d | 5b |
| Low Moor | Apr 22 | Oct 16 | 177 d | 5b |
| Lowden | Apr 27 | Oct 10 | 166 d | 5a |
| Lu Verne | Apr 30 | Oct 6 | 159 d | 5a |
| Luana | May 1 | Oct 3 | 155 d | 5a |
| Lucas | May 5 | Oct 5 | 153 d | 5b |
| Luther | Apr 23 | Oct 14 | 174 d | 5a |
| Luxemburg | Apr 21 | Oct 18 | 180 d | 5a |
| Luzerne | Apr 28 | Oct 10 | 165 d | 5a |
| Lynnville | May 3 | Oct 6 | 156 d | 5b |
| Lytton | Apr 30 | Oct 6 | 159 d | 5a |