A rating is assigned to plants and indicates the likelihood of resistance to cold according to average climatic conditions. This rating allows you to choose plants adapted to the climate of your region. This index can be affected by other conditions.
Agriculture Canada has produced a map on which it is easy to find its hardiness zone. This map is based on average climatic conditions (minimum winter temperatures, length of frost-free period, precipitation in summer, maximum temperatures in summer, snow, rains of January and the maximum wind speed) and altitude.
Check the map from Agriculture Canada to determine which zone you are located.
Canada is divided into nine zones, zero (0) being the coldest and eight (8) being the warmest. Each of the zones have subsequently sub-division where a is slightly colder and b is slightly warmer.