Michigan frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Saginaw | Apr 29 | Oct 21 | 175 d | 6a |
| Sagola | May 24 | Sep 25 | 124 d | 4b |
| Saint Charles | Apr 29 | Oct 21 | 175 d | 6a |
| Saint Clair | Apr 19 | Nov 3 | 198 d | 6a |
| Saint Clair Shores | Apr 29 | Oct 22 | 176 d | 6b |
| Saint Helen | May 19 | Sep 23 | 127 d | 5a |
| Saint Ignace | May 23 | Sep 30 | 130 d | 5b |
| Saint Johns | Apr 28 | Oct 24 | 179 d | 6a |
| Saint Joseph | May 5 | Oct 15 | 163 d | 6b |
| Saint Louis | May 1 | Oct 13 | 165 d | 6a |
| Salem | May 3 | Oct 13 | 163 d | 6a |
| Saline | May 2 | Oct 11 | 162 d | 6a |
| Samaria | Apr 27 | Oct 21 | 177 d | 6b |
| Sand Creek | Apr 27 | Oct 20 | 176 d | 6a |
| Sand Lake | May 14 | Sep 29 | 138 d | 6a |
| Sandusky | May 2 | Oct 16 | 167 d | 6a |
| Sanford | Apr 29 | Oct 16 | 170 d | 6a |
| Saranac | May 3 | Oct 12 | 162 d | 6a |
| Saugatuck | Apr 28 | Oct 21 | 176 d | 6b |
| Sault Sainte Marie | May 9 | Oct 11 | 155 d | 4b |
| Sawyer | Apr 27 | Oct 25 | 181 d | 6b |
| Schoolcraft | Apr 28 | Oct 18 | 173 d | 6a |
| Scotts | Apr 28 | Oct 18 | 173 d | 6a |
| Scottville | May 17 | Oct 7 | 143 d | 6a |
| Sears | May 13 | Oct 2 | 142 d | 5a |
| Sebewaing | May 7 | Oct 10 | 156 d | 6a |
| Seney | May 27 | Oct 10 | 136 d | 5a |
| Shaftsburg | Apr 28 | Oct 17 | 172 d | 6a |
| Shelby | May 12 | Oct 10 | 151 d | 6a |
| Shelbyville | May 4 | Oct 15 | 164 d | 6a |
| Shepherd | May 15 | Sep 29 | 137 d | 6a |
| Sheridan | May 18 | Sep 28 | 133 d | 6a |
| Sherwood | May 2 | Oct 13 | 164 d | 6a |
| Shingleton | May 23 | Oct 10 | 140 d | 5a |
| Sidnaw | May 25 | Sep 25 | 123 d | 4b |
| Sidney | May 18 | Sep 28 | 133 d | 5b |
| Silverwood | May 7 | Oct 9 | 155 d | 6a |
| Six Lakes | May 18 | Sep 28 | 133 d | 5b |
| Skandia | May 13 | Oct 2 | 142 d | 5a |
| Skanee | Jun 1 | Sep 23 | 114 d | 5a |
| Smiths Creek | Apr 19 | Nov 3 | 198 d | 6a |
| Smyrna | May 18 | Sep 28 | 133 d | 6a |
| Snover | May 2 | Oct 16 | 167 d | 6a |
| Sodus | May 5 | Oct 15 | 163 d | 6a |
| Somerset | May 5 | Oct 10 | 158 d | 6a |
| Somerset Center | May 3 | Oct 12 | 162 d | 6a |
| South Boardman | May 24 | Oct 4 | 133 d | 5b |
| South Branch | May 16 | Oct 5 | 142 d | 5a |
| South Haven | Apr 17 | Nov 5 | 202 d | 6b |
| South Lyon | May 5 | Oct 13 | 161 d | 6a |
| South Range | May 17 | Oct 1 | 137 d | 5a |
| South Rockwood | Apr 27 | Oct 22 | 178 d | 6b |
| Southfield | May 1 | Oct 17 | 169 d | 6b |
| Southgate | Apr 20 | Oct 27 | 190 d | 6b |
| Spalding | May 19 | Oct 1 | 135 d | 5a |
| Sparta | May 14 | Sep 29 | 138 d | 6a |
| Spring Arbor | May 1 | Oct 14 | 166 d | 6a |
| Spring Lake | Apr 30 | Oct 24 | 177 d | 6b |
| Springport | Apr 30 | Oct 14 | 167 d | 6a |
| Spruce | May 8 | Oct 16 | 161 d | 5b |
| Stambaugh | Jun 4 | Sep 10 | 98 d | 4a |
| Standish | May 5 | Oct 10 | 158 d | 5b |
| Stanton | May 18 | Sep 28 | 133 d | 5b |
| Stanwood | May 13 | Oct 2 | 142 d | 5b |
| Stephenson | May 22 | Sep 27 | 128 d | 5a |
| Sterling | May 5 | Oct 10 | 158 d | 5b |
| Sterling Heights | Apr 30 | Oct 24 | 177 d | 6b |
| Stevensville | May 5 | Oct 15 | 163 d | 6b |
| Stockbridge | Apr 30 | Oct 14 | 167 d | 6a |
| Sturgis | Apr 26 | Oct 21 | 178 d | 6a |
| Sumner | May 1 | Oct 13 | 165 d | 6a |
| Sunfield | May 3 | Oct 12 | 162 d | 6a |
| Suttons Bay | Apr 30 | Nov 1 | 185 d | 6b |
| Swartz Creek | May 6 | Oct 10 | 157 d | 6a |
| Sylvan Beach | May 19 | Oct 4 | 138 d | 6b |