Hardiness zones, also called growing zones or planting zones, show which plants can survive the winter in a given place. The zones on this map are Canada's plant hardiness zones for 1991 to 2020, published by Natural Resources Canada in 2025. Canadian zones combine several climate measures, including winter low temperatures, the length of the frost-free season, rainfall, snow cover and wind, so the temperature range shown with each zone, its extreme minimum winter temperature, is a guide rather than the whole definition. The previous edition, based on 1981 to 2010 data, is still available: New Brunswick hardiness zones, 2010 edition.
Under the 1991-2020 zones, New Brunswick spans 8 hardiness zones, from zone 3a (-40°C to -37.2°C) to zone 6b (-20.6°C to -17.8°C). Of the 45 cities and towns listed below, 15 are in zone 5a, the most common zone. Moncton is in zone 5a, Saint John is in zone 5b, Fredericton is in zone 5a, Dieppe is in zone 5b, Miramichi is in zone 5a.
| Location | Hardiness Zone (1991–2020) |
|---|---|
| Bathurst | 4a - -34.4°C to -31.7°C |
| Bouctouche | 5a - -28.9°C to -26.1°C |
| Campbellton | 4a - -34.4°C to -31.7°C |
| Caraquet | 4a - -34.4°C to -31.7°C |
| Centreville | 4b - -31.7°C to -28.9°C |
| Dalhousie | 4b - -31.7°C to -28.9°C |
| Dieppe | 5b - -26.1°C to -23.3°C |
| Dorchester | 5b - -26.1°C to -23.3°C |
| Edmundston | 4a - -34.4°C to -31.7°C |
| Florenceville-Bristol | 4b - -31.7°C to -28.9°C |
| Fredericton | 5a - -28.9°C to -26.1°C |
| Grand Bay - Westfield | 5b - -26.1°C to -23.3°C |
| Hampton | 5b - -26.1°C to -23.3°C |
| Hampton Station | 5b - -26.1°C to -23.3°C |
| Hartland | 4b - -31.7°C to -28.9°C |
| Island View | 5a - -28.9°C to -26.1°C |
| Kedgwick | 3b - -37.2°C to -34.4°C |
| Lamèque | 5a - -28.9°C to -26.1°C |
| Lorneville | 5b - -26.1°C to -23.3°C |
| McAdam | 5a - -28.9°C to -26.1°C |
| Minto | 5a - -28.9°C to -26.1°C |
| Miramichi | 5a - -28.9°C to -26.1°C |
| Moncton | 5a - -28.9°C to -26.1°C |
| Nackawic | 5a - -28.9°C to -26.1°C |
| Neguac | 4a - -34.4°C to -31.7°C |
| Oromocto | 5a - -28.9°C to -26.1°C |
| Pabineau First Nation | 4b - -31.7°C to -28.9°C |
| Perth-Andover | 4b - -31.7°C to -28.9°C |
| Quispamsis | 5b - -26.1°C to -23.3°C |
| Richibucto | 5a - -28.9°C to -26.1°C |
| Riverview | 5a - -28.9°C to -26.1°C |
| Rothesay | 5b - -26.1°C to -23.3°C |
| Sackville | 5b - -26.1°C to -23.3°C |
| Saint Andrews | 6a - -23.3°C to -20.6°C |
| Saint John | 5b - -26.1°C to -23.3°C |
| Saint Stephen | 4a - -34.4°C to -31.7°C |
| Saint-Antoine | 5a - -28.9°C to -26.1°C |
| Saint-Léonard | 4a - -34.4°C to -31.7°C |
| Saint-Quentin | 3b - -37.2°C to -34.4°C |
| Shediac | 5b - -26.1°C to -23.3°C |
| Shippagan | 5a - -28.9°C to -26.1°C |
| Sussex | 5b - -26.1°C to -23.3°C |
| Tobique / Neqotkuk | 4b - -31.7°C to -28.9°C |
| Tracadie-Sheila | 5a - -28.9°C to -26.1°C |
| Woodstock | 4b - -31.7°C to -28.9°C |