Pennsylvania frost dates: B
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Baden | Apr 8 | Nov 8 | 214 d | 6b |
| Bainbridge | Apr 9 | Nov 2 | 207 d | 7a |
| Bairdford | Apr 16 | Nov 1 | 199 d | 6b |
| Bakerstown | Apr 16 | Nov 1 | 199 d | 6b |
| Bala Cynwyd | Mar 30 | Nov 17 | 232 d | 7b |
| Bally | Apr 20 | Oct 23 | 186 d | 7a |
| Bangor | Apr 30 | Oct 18 | 171 d | 7a |
| Barnesville | Apr 30 | Oct 22 | 175 d | 6b |
| Bart | Apr 19 | Oct 24 | 188 d | 7a |
| Barto | Apr 20 | Oct 23 | 186 d | 6b |
| Bartonsville | May 1 | Oct 12 | 164 d | 6b |
| Bath | Apr 20 | Oct 24 | 187 d | 6b |
| Bausman | Apr 19 | Oct 24 | 188 d | 7a |
| Beach Haven | May 4 | Oct 11 | 160 d | 6b |
| Beach Lake | May 3 | Oct 9 | 159 d | 6a |
| Beallsville | Apr 13 | Nov 5 | 206 d | 6b |
| Bear Creek | May 7 | Oct 6 | 152 d | 6a |
| Bear Lake | May 22 | Sep 30 | 131 d | 5b |
| Beaver | Apr 28 | Oct 26 | 181 d | 6b |
| Beaver Falls | Apr 27 | Oct 25 | 181 d | 6b |
| Beaver Meadows | Apr 21 | Oct 23 | 185 d | 6b |
| Beaver Springs | Apr 25 | Oct 19 | 177 d | 6b |
| Beaverdale | Apr 29 | Oct 21 | 175 d | 6a |
| Beavertown | Apr 25 | Oct 19 | 177 d | 6b |
| Beccaria | May 10 | Oct 5 | 148 d | 6a |
| Bechtelsville | Apr 20 | Oct 23 | 186 d | 7a |
| Bedford | Apr 29 | Oct 13 | 167 d | 6b |
| Bedminster | Apr 29 | Oct 16 | 170 d | 7a |
| Beech Creek | Apr 30 | Oct 20 | 173 d | 6b |
| Belle Vernon | Apr 27 | Oct 22 | 178 d | 6b |
| Bellefonte | Apr 20 | Oct 26 | 189 d | 6b |
| Belleville | Apr 21 | Oct 24 | 186 d | 6b |
| Bellwood | Apr 25 | Oct 21 | 179 d | 6b |
| Belsano | May 17 | Oct 2 | 138 d | 6a |
| Bendersville | Apr 15 | Oct 27 | 195 d | 7a |
| Benezett | May 7 | Oct 15 | 161 d | 6a |
| Bensalem | Apr 21 | Oct 25 | 187 d | 7b |
| Bentleyville | Apr 13 | Nov 5 | 206 d | 6b |
| Benton | May 4 | Oct 11 | 160 d | 6a |
| Berlin | May 12 | Oct 5 | 146 d | 6a |
| Bernville | Apr 26 | Oct 19 | 176 d | 7a |
| Berrysburg | May 1 | Oct 16 | 168 d | 6b |
| Berwick | May 4 | Oct 11 | 160 d | 6b |
| Berwyn | Apr 18 | Oct 27 | 192 d | 7a |
| Bessemer | Apr 30 | Oct 23 | 176 d | 6a |
| Bethel | Apr 20 | Oct 25 | 188 d | 7a |
| Bethel Park | Apr 18 | Oct 28 | 193 d | 6b |
| Bethlehem | Apr 20 | Oct 24 | 187 d | 7a |
| Beyer | May 10 | Oct 12 | 155 d | 6a |
| Big Cove Tannery | Apr 7 | Nov 4 | 211 d | 7a |
| Big Run | May 6 | Oct 14 | 161 d | 6a |
| Bigler | May 4 | Oct 11 | 160 d | 6a |
| Biglerville | Apr 15 | Oct 27 | 195 d | 7a |
| Birchrunville | Apr 19 | Oct 25 | 189 d | 7a |
| Bird In Hand | Apr 19 | Oct 24 | 188 d | 7a |
| Birdsboro | Apr 16 | Oct 27 | 194 d | 7a |
| Black Lick | May 8 | Oct 13 | 158 d | 6b |
| Blain | Apr 18 | Oct 26 | 191 d | 7a |
| Blairs Mills | Apr 19 | Oct 28 | 192 d | 7a |
| Blairsville | May 2 | Oct 14 | 165 d | 6b |
| Blakeslee | May 6 | Oct 8 | 155 d | 6a |
| Blanchard | Apr 30 | Oct 20 | 173 d | 6b |
| Blandburg | May 10 | Oct 5 | 148 d | 6a |
| Blandon | Apr 10 | Oct 31 | 204 d | 7a |
| Blooming Glen | Apr 26 | Oct 17 | 174 d | 7a |
| Bloomsburg | Apr 27 | Oct 20 | 176 d | 6b |
| Blossburg | May 16 | Oct 2 | 139 d | 6a |
| Blue Ball | Apr 14 | Nov 1 | 201 d | 7a |
| Blue Bell | Apr 8 | Oct 31 | 206 d | 7a |
| Blue Ridge Summit | Apr 14 | Oct 30 | 199 d | 7a |
| Boalsburg | Apr 20 | Oct 26 | 189 d | 6b |
| Bobtown | Apr 28 | Oct 21 | 176 d | 6b |
| Boiling Springs | Apr 23 | Oct 18 | 178 d | 7a |
| Bolivar | Apr 26 | Oct 17 | 174 d | 6b |
| Boswell | May 6 | Oct 12 | 159 d | 6a |
| Bovard | May 1 | Oct 13 | 165 d | 6b |
| Bowers | Apr 26 | Oct 14 | 171 d | 7a |
| Bowmanstown | Apr 21 | Oct 23 | 185 d | 6b |
| Bowmansville | Apr 16 | Oct 27 | 194 d | 7a |
| Boyers | May 7 | Oct 14 | 160 d | 6a |
| Boyertown | Apr 20 | Oct 23 | 186 d | 7a |
| Boynton | May 12 | Oct 5 | 146 d | 6a |
| Brackenridge | Apr 16 | Nov 2 | 200 d | 6b |
| Brackney | May 14 | Oct 2 | 141 d | 6a |
| Braddock | Apr 5 | Nov 10 | 219 d | 6b |
| Bradenville | May 2 | Oct 14 | 165 d | 6b |
| Bradford | May 18 | Oct 4 | 139 d | 5b |
| Bradfordwoods | Apr 8 | Nov 8 | 214 d | 6b |
| Branchdale | Apr 27 | Oct 20 | 176 d | 6b |
| Branchton | May 7 | Oct 14 | 160 d | 6a |
| Brandamore | Apr 19 | Oct 25 | 189 d | 7a |
| Brandy Camp | May 13 | Oct 11 | 151 d | 6a |
| Brave | May 4 | Oct 12 | 161 d | 6b |
| Breezewood | Apr 27 | Oct 17 | 173 d | 6b |
| Breinigsville | Apr 26 | Oct 14 | 171 d | 7a |
| Bridgeport | Apr 8 | Oct 31 | 206 d | 7b |
| Bridgeville | Apr 18 | Oct 28 | 193 d | 6b |
| Brier Hill | Apr 30 | Oct 18 | 171 d | 6b |
| Brisbin | May 13 | Oct 1 | 141 d | 6a |
| Bristol | Apr 21 | Oct 25 | 187 d | 7b |
| Broad Top | Apr 23 | Oct 21 | 181 d | 6b |
| Brockport | May 13 | Oct 11 | 151 d | 6a |
| Brockton | Apr 30 | Oct 22 | 175 d | 6b |
| Brockway | May 6 | Oct 14 | 161 d | 6a |
| Brodheadsville | May 1 | Oct 12 | 164 d | 6b |
| Brogue | Apr 1 | Nov 10 | 223 d | 7a |
| Brookhaven | Mar 30 | Nov 16 | 231 d | 7b |
| Brooklyn | May 14 | Oct 2 | 141 d | 6a |
| Brookville | May 6 | Oct 14 | 161 d | 6a |
| Broomall | Apr 8 | Oct 31 | 206 d | 7b |
| Brownfield | Apr 30 | Oct 18 | 171 d | 6b |
| Brownstown | Apr 18 | Oct 25 | 190 d | 7a |
| Brownsville | Apr 13 | Nov 5 | 206 d | 6b |
| Bruin | May 7 | Oct 14 | 160 d | 6a |
| Brush Valley | May 8 | Oct 13 | 158 d | 6b |
| Bryn Athyn | Apr 4 | Nov 7 | 217 d | 7b |
| Bryn Mawr | Apr 8 | Oct 31 | 206 d | 7b |
| Buck Hill Falls | May 6 | Oct 8 | 155 d | 6b |
| Buckingham | Apr 13 | Oct 30 | 200 d | 7a |
| Buena Vista | May 2 | Oct 20 | 171 d | 6b |
| Buffalo Mills | May 4 | Oct 10 | 159 d | 6b |
| Bulger | Apr 23 | Oct 23 | 183 d | 6b |
| Bunola | Apr 27 | Oct 22 | 178 d | 6b |
| Burgettstown | Apr 29 | Oct 20 | 174 d | 6b |
| Burlington | May 2 | Oct 15 | 166 d | 6a |
| Burnham | Apr 21 | Oct 24 | 186 d | 7a |
| Burnside | May 4 | Oct 13 | 162 d | 6a |
| Burnt Cabins | Apr 18 | Oct 25 | 190 d | 7a |
| Bushkill | May 1 | Oct 12 | 164 d | 6b |
| Butler | May 7 | Oct 14 | 160 d | 6a |
| Byrnedale | May 13 | Oct 11 | 151 d | 6a |