Illinois frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| La Fayette | Apr 26 | Oct 12 | 169 d | 5b |
| La Grange | Apr 19 | Oct 22 | 186 d | 6a |
| La Grange Park | Apr 11 | Oct 31 | 203 d | 6a |
| La Harpe | Apr 21 | Oct 19 | 181 d | 6a |
| La Moille | Apr 22 | Oct 17 | 178 d | 5b |
| La Place | Apr 16 | Oct 22 | 189 d | 6a |
| La Prairie | Apr 18 | Oct 21 | 186 d | 6a |
| La Rose | Apr 20 | Oct 17 | 180 d | 5b |
| La Salle | Apr 24 | Oct 18 | 177 d | 5b |
| Lacon | Apr 20 | Oct 17 | 180 d | 5b |
| Ladd | Apr 24 | Oct 18 | 177 d | 5b |
| Lafox | Apr 25 | Oct 19 | 177 d | 5b |
| Lake Bluff | Apr 30 | Oct 19 | 172 d | 6a |
| Lake Forest | Apr 26 | Oct 21 | 178 d | 6a |
| Lake Fork | Apr 20 | Oct 16 | 179 d | 6a |
| Lake In The Hills | Apr 25 | Oct 22 | 180 d | 5b |
| Lake Villa | Apr 24 | Oct 23 | 182 d | 5b |
| Lake Zurich | Apr 29 | Oct 20 | 174 d | 5b |
| Lakewood | Apr 10 | Oct 24 | 197 d | 6b |
| Lanark | May 2 | Oct 7 | 158 d | 5a |
| Lancaster | Apr 2 | Oct 31 | 212 d | 6b |
| Lane | Apr 16 | Oct 22 | 189 d | 6a |
| Lansing | Apr 23 | Oct 20 | 180 d | 6a |
| Latham | Apr 20 | Oct 16 | 179 d | 6a |
| Laura | Apr 22 | Oct 14 | 175 d | 5b |
| Lawndale | Apr 20 | Oct 16 | 179 d | 6a |
| Lawrenceville | Apr 12 | Oct 25 | 196 d | 6b |
| Le Roy | Apr 25 | Oct 16 | 174 d | 6a |
| Leaf River | Apr 29 | Oct 7 | 161 d | 5b |
| Lebanon | Apr 12 | Oct 20 | 191 d | 6b |
| Lee | Apr 28 | Oct 10 | 165 d | 5b |
| Lee Center | Apr 27 | Oct 12 | 168 d | 5b |
| Leland | Apr 27 | Oct 15 | 171 d | 5b |
| Lemont | Apr 19 | Oct 22 | 186 d | 6a |
| Lena | Apr 27 | Oct 9 | 165 d | 5a |
| Lenzburg | Apr 12 | Oct 22 | 193 d | 6b |
| Leonore | Apr 20 | Oct 22 | 185 d | 5b |
| Lerna | Apr 15 | Oct 24 | 192 d | 6a |
| Lewistown | Apr 17 | Oct 19 | 185 d | 6a |
| Lexington | Apr 23 | Oct 15 | 175 d | 6a |
| Liberty | Apr 14 | Oct 23 | 192 d | 6a |
| Libertyville | Apr 30 | Oct 19 | 172 d | 6a |
| Lima | Apr 11 | Oct 23 | 195 d | 6a |
| Lincoln | Apr 20 | Oct 16 | 179 d | 6a |
| Lincoln'S New Salem | Apr 13 | Oct 21 | 191 d | 6a |
| Lincolnshire | Apr 19 | Oct 26 | 190 d | 6a |
| Lincolnwood | Apr 26 | Oct 21 | 178 d | 6a |
| Lindenwood | Apr 26 | Oct 13 | 170 d | 5b |
| Lisle | Apr 28 | Oct 16 | 171 d | 5b |
| Litchfield | Apr 13 | Oct 24 | 194 d | 6b |
| Literberry | Apr 19 | Oct 17 | 181 d | 6a |
| Little York | Apr 22 | Oct 14 | 175 d | 5b |
| Littleton | Apr 16 | Oct 23 | 190 d | 6a |
| Liverpool | Apr 17 | Oct 19 | 185 d | 6a |
| Livingston | Apr 13 | Oct 24 | 194 d | 6b |
| Loami | Apr 7 | Oct 29 | 205 d | 6a |
| Lockport | Apr 20 | Oct 22 | 185 d | 6a |
| Loda | Apr 23 | Oct 12 | 172 d | 6a |
| Logan | Apr 4 | Oct 28 | 207 d | 6b |
| Lomax | Apr 21 | Oct 19 | 181 d | 6a |
| Lombard | Apr 28 | Oct 16 | 171 d | 6a |
| London Mills | Apr 22 | Oct 19 | 180 d | 5b |
| Long Point | Apr 12 | Oct 28 | 199 d | 5b |
| Longview | Apr 15 | Oct 20 | 188 d | 6a |
| Loraine | Apr 18 | Oct 21 | 186 d | 6a |
| Lostant | Apr 12 | Oct 28 | 199 d | 5b |
| Louisville | Apr 10 | Oct 23 | 196 d | 6b |
| Lovejoy | Apr 12 | Oct 20 | 191 d | 7a |
| Loves Park | Apr 24 | Oct 17 | 176 d | 5b |
| Lovington | Apr 15 | Oct 22 | 190 d | 6a |
| Lowder | Apr 7 | Oct 29 | 205 d | 6b |
| Lowpoint | Apr 20 | Oct 17 | 180 d | 5b |
| Ludlow | Apr 21 | Oct 18 | 180 d | 6a |
| Lyndon | Apr 26 | Oct 13 | 170 d | 5b |
| Lynn Center | Apr 28 | Oct 12 | 167 d | 5b |
| Lyons | Apr 11 | Oct 31 | 203 d | 6a |