| 1961-1990 zone | 1991-2020 zone | 1961-1990 hardiness index | 1991-2020 hardiness index |
| Sackville | 5a | 5b | 53 | 55 |
| Saint Andrews | 5b | 6a | 56 | 60 |
| Saint John | 5a | 5b | 54 | 58 |
| Saint-Antoine | 5a | 5a | 51 | 53 |
| Saint-Arthur | 3b | 4a | 35 | 40 |
| Sainte-Anne-de-Kent | 5a | 5a | 51 | 53 |
| Sainte-Anne-de-Madawaska | 3b | 4a | 38 | 42 |
| Sainte-Marie-Saint-Raphaël | 0a | 0a | 0 | 0 |
| Sainte-Rose-Gloucester | 4b | 5a | 49 | 53 |
| Saint-François de Madawaska | 3b | 3b | 36 | 38 |
| Saint-Ignace | 4b | 5a | 49 | 52 |
| Saint-Isidore | 4b | 5a | 48 | 52 |
| Saint-Jean-Baptiste-de-Restigouche | 3a | 3b | 30 | 37 |
| Saint-Louis de Kent | 5a | 5a | 50 | 53 |
| Saint-Léolin | 4b | 5a | 47 | 51 |
| Saint-Martin-de-Restigouche | 3a | 3b | 31 | 38 |
| Saint-Paul | 4b | 5a | 49 | 51 |
| Saint-Quentin | 3a | 3b | 31 | 38 |
| Saint-Sauveur | 4b | 5a | 47 | 50 |
| Salisbury | 5a | 5a | 50 | 53 |
| Salmon Creek | 4b | 5a | 47 | 50 |
| Saumarez | 5a | 5a | 50 | 53 |
| Scoudouc | 5a | 5b | 52 | 55 |
| Sevogle | 4b | 4b | 45 | 48 |
| Shediac | 0a | 0a | 0 | 0 |
| Shediac Bridge | 5a | 5b | 52 | 55 |
| Shippagan | 0a | 0a | 0 | 0 |
| Siegas | 3b | 4a | 37 | 42 |
| Sillikers | 4a | 4b | 44 | 48 |
| St. André | 3b | 4a | 37 | 42 |
| St. George | 5b | 5b | 55 | 59 |
| St. Hilaire | 3b | 4a | 37 | 40 |
| St. Leonard | 3b | 4a | 36 | 42 |
| St. Margarets | 4b | 5a | 48 | 51 |
| St. Martins | 5a | 5b | 54 | 58 |
| St. Stephen | 5b | 6a | 55 | 60 |
| Stanley | 4a | 4b | 42 | 46 |
| Sunny Corner | 4a | 4b | 44 | 48 |
| Sussex | 5a | 5b | 51 | 55 |