Maryland frost dates: B
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Baldwin | Apr 2 | Nov 7 | 219 d | 7b |
| Baltimore | Mar 24 | Nov 21 | 242 d | 7b |
| Barclay | Apr 3 | Nov 5 | 216 d | 7b |
| Barnesville | Apr 14 | Oct 29 | 198 d | 7a |
| Barstow | Apr 17 | Oct 27 | 193 d | 7b |
| Barton | Apr 29 | Oct 20 | 174 d | 6b |
| Beallsville | Apr 14 | Oct 29 | 198 d | 7b |
| Bel Air | Apr 10 | Oct 30 | 203 d | 7b |
| Bel Alton | Apr 17 | Oct 27 | 193 d | 7b |
| Belcamp | Apr 10 | Oct 30 | 203 d | 7b |
| Beltsville | Apr 10 | Nov 1 | 205 d | 7b |
| Benedict | Apr 17 | Oct 27 | 193 d | 7b |
| Benson | Apr 10 | Oct 30 | 203 d | 7b |
| Berlin | Apr 7 | Nov 2 | 209 d | 7b |
| Bethesda | Apr 1 | Nov 6 | 219 d | 7b |
| Bethlehem | Apr 1 | Nov 7 | 220 d | 7b |
| Betterton | Apr 10 | Oct 30 | 203 d | 7b |
| Big Pool | Apr 17 | Oct 23 | 189 d | 7a |
| Bishopville | Apr 7 | Nov 2 | 209 d | 7b |
| Bittinger | Apr 29 | Oct 20 | 174 d | 6a |
| Bivalve | Apr 8 | Nov 4 | 210 d | 8a |
| Bladensburg | Mar 29 | Nov 8 | 224 d | 7b |
| Bloomington | Apr 29 | Oct 20 | 174 d | 6b |
| Boonsboro | Apr 11 | Oct 28 | 200 d | 7a |
| Boring | Apr 19 | Oct 25 | 189 d | 7a |
| Bowie | Apr 9 | Oct 29 | 203 d | 7b |
| Boyds | Apr 14 | Oct 29 | 198 d | 7b |
| Bozman | Apr 1 | Nov 7 | 220 d | 8a |
| Braddock Heights | Apr 2 | Nov 6 | 218 d | 7b |
| Brandywine | Apr 3 | Nov 8 | 219 d | 7b |
| Brentwood | Mar 29 | Nov 8 | 224 d | 7b |
| Brinklow | Apr 1 | Nov 6 | 219 d | 7b |
| Brookeville | Apr 1 | Nov 6 | 219 d | 7b |
| Brooklandville | Apr 2 | Nov 7 | 219 d | 7b |
| Brooklyn | Mar 24 | Nov 21 | 242 d | 8a |
| Broomes Island | Mar 22 | Nov 26 | 249 d | 8a |
| Brownsville | Apr 26 | Oct 18 | 175 d | 7a |
| Brunswick | Apr 26 | Oct 18 | 175 d | 7a |
| Bryans Road | Apr 3 | Nov 8 | 219 d | 7b |
| Bryantown | Apr 17 | Oct 27 | 193 d | 7b |
| Buckeystown | Apr 2 | Nov 6 | 218 d | 7b |
| Burkittsville | Apr 26 | Oct 18 | 175 d | 7a |
| Burtonsville | Apr 5 | Nov 9 | 218 d | 7b |
| Bushwood | Apr 17 | Oct 27 | 193 d | 8a |
| Butler | Apr 19 | Oct 25 | 189 d | 7b |