Pennsylvania frost dates: S
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Sabinsville | May 10 | Oct 5 | 148 d | 5b |
| Sacramento | May 1 | Oct 16 | 168 d | 6b |
| Sadsburyville | Apr 19 | Oct 25 | 189 d | 7a |
| Saegertown | Apr 30 | Oct 23 | 176 d | 6a |
| Sagamore | May 10 | Oct 12 | 155 d | 6a |
| Saint Benedict | May 10 | Oct 5 | 148 d | 6a |
| Saint Boniface | May 10 | Oct 5 | 148 d | 6a |
| Saint Clair | Apr 30 | Oct 22 | 175 d | 6b |
| Saint Johns | Apr 30 | Oct 22 | 175 d | 6b |
| Saint Marys | May 14 | Oct 6 | 145 d | 5b |
| Saint Michael | Apr 29 | Oct 21 | 175 d | 6a |
| Saint Peters | Apr 11 | Nov 1 | 204 d | 7a |
| Saint Petersburg | May 9 | Oct 11 | 155 d | 6a |
| Saint Thomas | Apr 18 | Oct 25 | 190 d | 7a |
| Salford | Apr 24 | Oct 15 | 174 d | 7a |
| Salfordville | Apr 24 | Oct 15 | 174 d | 7a |
| Salina | Apr 29 | Oct 20 | 174 d | 6b |
| Salisbury | May 12 | Oct 5 | 146 d | 6a |
| Salix | Apr 29 | Oct 21 | 175 d | 6a |
| Saltillo | Apr 19 | Oct 28 | 192 d | 7a |
| Saltsburg | May 2 | Oct 14 | 165 d | 6b |
| Sandy Lake | May 2 | Oct 23 | 174 d | 6a |
| Sandy Ridge | May 13 | Oct 1 | 141 d | 6a |
| Sarver | Apr 21 | Oct 30 | 192 d | 6b |
| Sassamansville | Apr 20 | Oct 23 | 186 d | 7a |
| Saxonburg | May 7 | Oct 14 | 160 d | 6b |
| Saxton | Apr 23 | Oct 21 | 181 d | 6b |
| Saylorsburg | May 1 | Oct 12 | 164 d | 6b |
| Sayre | May 6 | Oct 10 | 157 d | 6a |
| Scenery Hill | Apr 24 | Oct 23 | 182 d | 6b |
| Schaefferstown | Apr 20 | Oct 25 | 188 d | 7a |
| Schellsburg | May 4 | Oct 10 | 159 d | 6b |
| Schenley | Apr 21 | Oct 30 | 192 d | 6b |
| Schnecksville | Apr 20 | Oct 24 | 187 d | 6b |
| Schuylkill Haven | Apr 16 | Oct 25 | 192 d | 7a |
| Schwenksville | Apr 24 | Oct 15 | 174 d | 7a |
| Sciota | May 1 | Oct 12 | 164 d | 6b |
| Scotland | Apr 18 | Oct 25 | 190 d | 7a |
| Scotrun | May 6 | Oct 8 | 155 d | 6a |
| Scottdale | Apr 22 | Oct 27 | 188 d | 6b |
| Scranton | Apr 23 | Oct 20 | 180 d | 6b |
| Seanor | Apr 29 | Oct 21 | 175 d | 6a |
| Selinsgrove | Apr 27 | Oct 16 | 172 d | 6b |
| Sellersville | Apr 26 | Oct 17 | 174 d | 7a |
| Seltzer | Apr 30 | Oct 22 | 175 d | 6b |
| Seminole | May 10 | Oct 12 | 155 d | 6b |
| Seneca | May 2 | Oct 23 | 174 d | 6a |
| Seven Valleys | Apr 26 | Oct 19 | 176 d | 7a |
| Seward | Apr 29 | Oct 21 | 175 d | 6b |
| Sewickley | Apr 8 | Nov 8 | 214 d | 6b |
| Shade Gap | Apr 19 | Oct 28 | 192 d | 7a |
| Shady Grove | Apr 7 | Nov 4 | 211 d | 7a |
| Shamokin | Apr 27 | Oct 20 | 176 d | 6b |
| Shamokin Dam | Apr 30 | Oct 13 | 166 d | 6b |
| Shanksville | May 4 | Oct 10 | 159 d | 6a |
| Sharon | May 1 | Oct 17 | 169 d | 6a |
| Sharon Hill | Apr 2 | Nov 10 | 222 d | 7b |
| Sharpsville | May 1 | Oct 17 | 169 d | 6a |
| Shartlesville | Apr 16 | Oct 25 | 192 d | 7a |
| Shavertown | Apr 23 | Oct 20 | 180 d | 6a |
| Shawanese | Apr 23 | Oct 20 | 180 d | 6a |
| Shawnee On Delaware | May 1 | Oct 12 | 164 d | 6b |
| Shawville | May 4 | Oct 11 | 160 d | 6a |
| Sheakleyville | Apr 30 | Oct 23 | 176 d | 6a |
| Sheffield | May 4 | Oct 21 | 170 d | 5b |
| Shelocta | May 8 | Oct 13 | 158 d | 6b |
| Shenandoah | Apr 30 | Oct 22 | 175 d | 6b |
| Sheppton | Apr 30 | Oct 22 | 175 d | 6b |
| Shermans Dale | Apr 23 | Oct 18 | 178 d | 7a |
| Shickshinny | May 4 | Oct 11 | 160 d | 6b |
| Shinglehouse | May 20 | Sep 29 | 132 d | 5b |
| Shippensburg | Apr 19 | Oct 24 | 188 d | 7a |
| Shippenville | May 9 | Oct 11 | 155 d | 6a |
| Shippingport | Apr 28 | Oct 26 | 181 d | 6b |
| Shirleysburg | Apr 19 | Oct 28 | 192 d | 7a |
| Shoemakersville | Apr 16 | Oct 25 | 192 d | 7a |
| Shohola | May 2 | Oct 12 | 163 d | 6a |
| Shrewsbury | Apr 19 | Oct 25 | 189 d | 7a |
| Shunk | May 16 | Oct 2 | 139 d | 6a |
| Sidman | Apr 29 | Oct 21 | 175 d | 6b |
| Sigel | May 13 | Oct 7 | 147 d | 6a |
| Silver Spring | Apr 30 | Oct 10 | 163 d | 7a |
| Silverdale | Apr 26 | Oct 17 | 174 d | 7a |
| Sinnamahoning | May 10 | Oct 16 | 159 d | 6a |
| Sipesville | May 6 | Oct 12 | 159 d | 5b |
| Six Mile Run | Apr 23 | Oct 21 | 181 d | 6b |
| Skippack | Apr 24 | Oct 15 | 174 d | 7a |
| Skytop | May 6 | Oct 8 | 155 d | 6a |
| Slate Run | Apr 30 | Oct 22 | 175 d | 6a |
| Slatedale | Apr 21 | Oct 23 | 185 d | 6b |
| Slatington | Apr 21 | Oct 23 | 185 d | 6b |
| Slickville | May 2 | Oct 14 | 165 d | 6b |
| Sligo | May 9 | Oct 11 | 155 d | 6a |
| Slippery Rock | May 7 | Oct 14 | 160 d | 6a |
| Slovan | Apr 23 | Oct 23 | 183 d | 6b |
| Smethport | May 15 | Oct 3 | 141 d | 5b |
| Smicksburg | May 10 | Oct 12 | 155 d | 6a |
| Smithfield | Apr 25 | Oct 24 | 182 d | 6b |
| Smithmill | May 10 | Oct 5 | 148 d | 6a |
| Smithton | Apr 27 | Oct 22 | 178 d | 6b |
| Smock | Apr 30 | Oct 18 | 171 d | 6b |
| Smokerun | May 4 | Oct 11 | 160 d | 6a |
| Smoketown | Apr 19 | Oct 24 | 188 d | 7a |
| Snow Shoe | May 21 | Sep 27 | 129 d | 6a |
| Snydersburg | May 13 | Oct 7 | 147 d | 6a |
| Snydertown | Apr 30 | Oct 13 | 166 d | 6b |
| Solebury | Apr 16 | Oct 19 | 186 d | 7a |
| Somerset | May 2 | Oct 17 | 168 d | 6a |
| Souderton | Apr 26 | Oct 17 | 174 d | 7a |
| South Canaan | May 10 | Oct 4 | 147 d | 6a |
| South Fork | Apr 29 | Oct 21 | 175 d | 6a |
| South Gibson | May 14 | Oct 1 | 140 d | 6a |
| South Heights | Apr 8 | Nov 8 | 214 d | 6b |
| South Montrose | May 14 | Oct 2 | 141 d | 5b |
| South Mountain | Apr 27 | Oct 20 | 176 d | 7a |
| South Park | Apr 18 | Oct 28 | 193 d | 6b |
| South Sterling | May 6 | Oct 8 | 155 d | 6a |
| Southampton | Apr 21 | Oct 25 | 187 d | 7a |
| Southeastern | Apr 19 | Oct 25 | 189 d | 7a |
| Southview | Apr 24 | Oct 23 | 182 d | 6b |
| Southwest | May 2 | Oct 14 | 165 d | 6b |
| Spangler | May 10 | Oct 5 | 148 d | 6a |
| Spartansburg | May 12 | Oct 10 | 151 d | 6a |
| Spinnerstown | Apr 26 | Oct 17 | 174 d | 7a |
| Spraggs | May 3 | Oct 15 | 165 d | 6b |
| Sprankle Mills | May 10 | Oct 12 | 155 d | 6a |
| Spring Church | May 4 | Oct 16 | 165 d | 6b |
| Spring City | Apr 20 | Oct 23 | 186 d | 7a |
| Spring Creek | May 22 | Sep 30 | 131 d | 5b |
| Spring Glen | May 1 | Oct 16 | 168 d | 6b |
| Spring Grove | Apr 27 | Oct 18 | 174 d | 7a |
| Spring House | Apr 11 | Nov 1 | 204 d | 7a |
| Spring Mills | May 5 | Oct 6 | 154 d | 6b |
| Spring Mount | Apr 24 | Oct 15 | 174 d | 7a |
| Spring Run | Apr 19 | Oct 24 | 188 d | 7a |
| Springboro | May 8 | Oct 16 | 161 d | 6a |
| Springdale | Apr 16 | Nov 1 | 199 d | 6b |
| Springfield | Apr 2 | Nov 10 | 222 d | 7b |
| Springs | May 12 | Oct 5 | 146 d | 6a |
| Springtown | Apr 21 | Oct 22 | 184 d | 7a |
| Springville | May 14 | Oct 2 | 141 d | 6a |
| Sproul | Apr 23 | Oct 21 | 181 d | 6b |
| Spruce Creek | Apr 19 | Oct 28 | 192 d | 6b |
| Stahlstown | Apr 30 | Oct 17 | 170 d | 6a |
| Star Junction | Apr 27 | Oct 22 | 178 d | 6b |
| Starford | May 8 | Oct 13 | 158 d | 6a |
| Starlight | May 12 | Oct 9 | 150 d | 5b |
| Starrucca | May 14 | Oct 1 | 140 d | 5b |
| State College | Apr 20 | Oct 26 | 189 d | 6b |
| State Line | Apr 7 | Nov 4 | 211 d | 7b |
| Sterling | May 6 | Oct 8 | 155 d | 6a |
| Stevens | Apr 18 | Oct 25 | 190 d | 7a |
| Stevensville | May 2 | Oct 15 | 166 d | 6a |
| Stewartstown | Apr 19 | Oct 25 | 189 d | 7a |
| Stillwater | May 4 | Oct 11 | 160 d | 6b |
| Stockdale | Apr 13 | Nov 5 | 206 d | 6b |
| Stockertown | Apr 18 | Oct 25 | 190 d | 7a |
| Stoneboro | May 15 | Oct 3 | 141 d | 6a |
| Stoystown | May 6 | Oct 12 | 159 d | 6a |
| Strabane | Apr 24 | Oct 23 | 182 d | 6b |
| Strasburg | Apr 19 | Oct 24 | 188 d | 7a |
| Strattanville | May 9 | Oct 11 | 155 d | 6a |
| Strausstown | Apr 16 | Oct 25 | 192 d | 7a |
| Strongstown | May 17 | Oct 2 | 138 d | 6a |
| Stroudsburg | May 1 | Oct 12 | 164 d | 6b |
| Stump Creek | May 6 | Oct 14 | 161 d | 6a |
| Sturgeon | Apr 23 | Oct 23 | 183 d | 6b |
| Sugar Grove | May 22 | Sep 30 | 131 d | 5b |
| Sugar Run | May 14 | Oct 2 | 141 d | 6a |
| Sugarloaf | Apr 30 | Oct 22 | 175 d | 6b |
| Summerdale | Apr 15 | Oct 23 | 191 d | 7a |
| Summerhill | May 17 | Oct 2 | 138 d | 6a |
| Summerville | May 10 | Oct 12 | 155 d | 6a |
| Summit Hill | Apr 21 | Oct 23 | 185 d | 6b |
| Summit Station | Apr 16 | Oct 25 | 192 d | 7a |
| Sumneytown | Apr 24 | Oct 15 | 174 d | 7a |
| Sunbury | Apr 30 | Oct 13 | 166 d | 6b |
| Suplee | Apr 16 | Oct 27 | 194 d | 7a |
| Susquehanna | May 12 | Oct 9 | 150 d | 5b |
| Sutersville | Apr 27 | Oct 22 | 178 d | 6b |
| Swarthmore | Apr 2 | Nov 10 | 222 d | 7b |
| Sweet Valley | May 4 | Oct 11 | 160 d | 6a |
| Swengel | Apr 25 | Oct 19 | 177 d | 6b |
| Swiftwater | May 6 | Oct 8 | 155 d | 6b |
| Sybertsville | Apr 30 | Oct 22 | 175 d | 6b |
| Sycamore | May 3 | Oct 15 | 165 d | 6a |
| Sykesville | May 6 | Oct 14 | 161 d | 6a |
| Sylvania | May 16 | Oct 2 | 139 d | 6a |