Washington frost dates: L
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| La Center | Apr 26 | Oct 16 | 173 d | 8b |
| La Conner | Mar 24 | Nov 3 | 224 d | 8b |
| La Grande | Apr 11 | Oct 30 | 202 d | 8b |
| La Push | Apr 20 | Oct 26 | 189 d | 9a |
| Lacey | Apr 29 | Oct 14 | 168 d | 8b |
| Lacrosse | May 13 | Sep 26 | 136 d | 7a |
| Lake Stevens | Mar 24 | Nov 2 | 223 d | 8b |
| Lakebay | Mar 11 | Nov 21 | 255 d | 8b |
| Lakewood | Mar 8 | Nov 14 | 251 d | 8b |
| Lamona | May 14 | Sep 26 | 135 d | 6b |
| Lamont | Apr 29 | Oct 4 | 158 d | 6b |
| Langley | Mar 9 | Nov 17 | 253 d | 8b |
| Latah | May 11 | Oct 5 | 147 d | 6b |
| Laurier | May 8 | Oct 1 | 146 d | 6b |
| Leavenworth | May 10 | Sep 30 | 143 d | 7a |
| Lebam | Apr 26 | Oct 17 | 174 d | 8b |
| Liberty Lake | Apr 26 | Oct 15 | 172 d | 6b |
| Lilliwaup | Mar 24 | Nov 15 | 236 d | 8b |
| Lincoln | Jun 1 | Sep 22 | 113 d | 7a |
| Lind | May 7 | Oct 4 | 150 d | 7a |
| Littlerock | Apr 29 | Oct 14 | 168 d | 8a |
| Long Beach | Apr 6 | Oct 26 | 203 d | 9a |
| Longbranch | Mar 11 | Nov 21 | 255 d | 8b |
| Longmire | May 22 | Oct 3 | 134 d | 7b |
| Longview | Apr 8 | Nov 5 | 211 d | 8b |
| Loomis | Apr 26 | Oct 10 | 167 d | 6a |
| Loon Lake | May 22 | Sep 14 | 115 d | 6a |
| Lopez Island | Mar 26 | Nov 10 | 229 d | 9a |
| Lummi Island | Apr 1 | Nov 2 | 215 d | 8b |
| Lyle | May 12 | Oct 11 | 152 d | 7b |
| Lyman | Mar 27 | Nov 6 | 224 d | 8b |
| Lynden | Apr 18 | Oct 18 | 183 d | 8a |
| Lynnwood | Mar 9 | Nov 17 | 253 d | 9a |