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: Prince Edward Island hardiness zones, 2010 edition.
Under the 1991-2020 zones, Prince Edward Island spans 2 hardiness zones, from zone 5b (-26.1°C to -23.3°C) to zone 6a (-23.3°C to -20.6°C). Of the 10 cities and towns listed below, 8 are in zone 5b, the most common zone. Charlottetown is in zone 5b, Summerside is in zone 5b, Stratford is in zone 5b.
| Location | Hardiness Zone (1991–2020) |
|---|---|
| Alberton | 5b - -26.1°C to -23.3°C |
| Borden-Carleton | 5b - -26.1°C to -23.3°C |
| Charlottetown | 5b - -26.1°C to -23.3°C |
| Georgetown | 6a - -23.3°C to -20.6°C |
| Kensington | 5b - -26.1°C to -23.3°C |
| North Rustico | 5b - -26.1°C to -23.3°C |
| Souris | 6a - -23.3°C to -20.6°C |
| Stratford | 5b - -26.1°C to -23.3°C |
| Summerside | 5b - -26.1°C to -23.3°C |
| Tignish | 5b - -26.1°C to -23.3°C |