Minnesota frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sabin | May 4 | Oct 2 | 151 d | 4a |
| Sacred Heart | May 4 | Oct 1 | 150 d | 4b |
| Saginaw | May 18 | Oct 1 | 136 d | 4a |
| Saint Bonifacius | May 5 | Oct 5 | 153 d | 4b |
| Saint Charles | Apr 23 | Oct 16 | 176 d | 4b |
| Saint Clair | Apr 30 | Oct 9 | 162 d | 5a |
| Saint Cloud | May 7 | Sep 30 | 146 d | 4b |
| Saint Francis | May 1 | Oct 7 | 159 d | 4b |
| Saint Hilaire | May 14 | Sep 28 | 137 d | 3b |
| Saint James | Apr 30 | Oct 7 | 160 d | 5a |
| Saint Joseph | May 3 | Oct 7 | 157 d | 4b |
| Saint Martin | May 4 | Oct 1 | 150 d | 4b |
| Saint Michael | May 4 | Oct 5 | 154 d | 4b |
| Saint Paul | Apr 24 | Oct 16 | 175 d | 5a |
| Saint Paul Park | Apr 24 | Oct 16 | 175 d | 5a |
| Saint Peter | May 2 | Oct 4 | 155 d | 4b |
| Saint Stephen | May 10 | Sep 29 | 142 d | 4a |
| Saint Vincent | May 16 | Sep 29 | 136 d | 3b |
| Salol | May 16 | Sep 24 | 131 d | 3b |
| Sanborn | May 4 | Oct 1 | 150 d | 5a |
| Sandstone | May 18 | Sep 26 | 131 d | 4a |
| Santiago | May 7 | Sep 28 | 144 d | 4b |
| Sargeant | May 6 | Oct 1 | 148 d | 5a |
| Sartell | May 10 | Sep 29 | 142 d | 4b |
| Sauk Centre | May 4 | Oct 1 | 150 d | 4b |
| Sauk Rapids | May 7 | Sep 30 | 146 d | 4b |
| Savage | Apr 23 | Oct 14 | 174 d | 5a |
| Sawyer | May 26 | Sep 23 | 120 d | 4a |
| Scandia | May 3 | Oct 5 | 155 d | 4b |
| Schroeder | May 15 | Oct 1 | 139 d | 4b |
| Seaforth | Apr 30 | Oct 10 | 163 d | 4b |
| Searles | May 2 | Oct 7 | 158 d | 5a |
| Sebeka | May 10 | Sep 29 | 142 d | 4a |
| Shafer | May 4 | Oct 8 | 157 d | 4b |
| Shakopee | Apr 23 | Oct 14 | 174 d | 5a |
| Shelly | May 2 | Oct 9 | 160 d | 4a |
| Sherburn | Apr 28 | Oct 8 | 163 d | 5a |
| Shevlin | May 18 | Sep 27 | 132 d | 3b |
| Side Lake | Jun 1 | Sep 15 | 106 d | 3b |
| Silver Bay | May 15 | Oct 1 | 139 d | 4a |
| Silver Creek | Apr 30 | Oct 9 | 162 d | 4b |
| Silver Lake | Apr 28 | Oct 8 | 163 d | 4b |
| Slayton | May 7 | Sep 29 | 145 d | 5a |
| Sleepy Eye | Apr 29 | Oct 7 | 161 d | 5a |
| Solway | May 18 | Sep 27 | 132 d | 3b |
| Soudan | frost any month | 3a | ||
| South Haven | May 2 | Oct 5 | 156 d | 4b |
| South International Falls | May 29 | Sep 13 | 107 d | 3b |
| South Saint Paul | Apr 24 | Oct 16 | 175 d | 5a |
| Spicer | May 4 | Oct 4 | 153 d | 4b |
| Spring Grove | May 10 | Sep 28 | 141 d | 5a |
| Spring Lake | May 14 | Oct 2 | 141 d | 3b |
| Spring Park | Apr 30 | Oct 9 | 162 d | 4b |
| Spring Valley | May 6 | Oct 1 | 148 d | 4b |
| Springfield | May 4 | Oct 1 | 150 d | 5a |
| Squaw Lake | May 16 | Sep 26 | 133 d | 3b |
| Stacy | May 3 | Oct 5 | 155 d | 4b |
| Stanchfield | May 2 | Oct 4 | 155 d | 4b |
| Staples | May 10 | Sep 30 | 143 d | 4a |
| Starbuck | May 11 | Sep 27 | 139 d | 4b |
| Steen | May 1 | Oct 4 | 156 d | 5a |
| Stephen | May 15 | Sep 26 | 134 d | 4a |
| Stewart | Apr 30 | Oct 4 | 157 d | 4b |
| Stewartville | Apr 30 | Oct 6 | 159 d | 4b |
| Stillwater | Apr 30 | Oct 11 | 164 d | 4b |
| Stockton | Apr 23 | Oct 21 | 181 d | 5a |
| Storden | May 3 | Oct 2 | 152 d | 5a |
| Strandquist | May 15 | Sep 26 | 134 d | 3b |
| Strathcona | May 6 | Oct 3 | 150 d | 3b |
| Sturgeon Lake | May 12 | Oct 2 | 143 d | 4a |
| Sunburg | May 4 | Oct 4 | 153 d | 4b |
| Swan River | May 29 | Sep 18 | 112 d | 4a |
| Swanville | May 13 | Sep 27 | 137 d | 4a |
| Swatara | May 7 | Oct 3 | 149 d | 4a |
| Swift | May 16 | Sep 24 | 131 d | 3b |