Annuals can be higher, but not beyond the top number, of course, because we just grow them for one season. Perennials need to be your zone or lower. Your local plant nurseries should have zone ranges on their plant tags. Yukon Territory | Look Up by Municipality.Northwest Territories | Look Up by Municipality.Prince Edward Island | Look Up by MunicipalityĬharlottetown: 5b | Summerside: 5b | Cornwall: 5b.John’s: 6a | Corner Brook: 5a | Grand Falls-Windsor: 4b | Gander: 5a | Labrador City: 1a Newfoundland and Labrador | Look Up by Municipality.
Halifax: 6b | Sydney: 5 | Truro: 5b | New Glasgow: 6a Moncton: 5b | Saint John: 5b | Fredericton: 5b | Bathurst: 4b
New Brunswick | Look Up by Municipality. Montréal: 6a | Québec: 5a | Ottawa-Gatineau: 5a | Sherbrooke: 5a | Trois-Rivières: 5a | Chicoutimi – Jonquière: 3b Toronto: 7a | Ottawa-Gatineau: 5b | Hamilton: 6b | Kitchener: 5b | Waterloo: 5b | London: 6b | Oshawa: 6a | Windsor: 7 | Sudbury: 4b | Kenora: 4a So, know your zone, but consider your circumstances as well. There is no data available to the map makers to account for these exceptions, but you as a gardener will gradually learn how plants fare in your garden. Plus, every area has its own micro-climates.Ī wide-open garden in zone 5 may be subject to lots of wind and freezes while a zone 5 garden enclosed with walls or other windbreaks may be a warmer micro-climate that never reaches the same lows. We also have to consider that our climate is always shifting, and zones will change over time, and the zone maps are not frequently updated. Some of the plants and seeds we purchase here in Canada may also be using the USDA zone system numbers, so keep in mind that it’s not precise, just a guideline. This means they will likely not survive winters below zone 4 temperatures or climates zone 10 or higher, but there are always exceptions to be found. Our zones range from 0 to 9, where zero is the coldest and 9 is the warmest average conditions.įor example, many clematis vines are suitable for zones 4 to 9. Zone is often the first consideration-can this perennial survive year-round in my climate?-and other growing conditions like sun, soil, and water come next. The purpose of these zones for home gardeners is help guide our plant selections. 
When comparing standards and assigned zones, the difference is, perhaps, a half zone or so apart (e.g. While the USDA system is based on minimum temperatures, the most recent Canadian system includes minimum temperatures as well as rainfall, frost-free days, and other variables. One common question is whether the Canadian and USDA plant hardiness zone systems are comparable, and the answer is, sort of. Are Canadian and American Garden Zones the Same?
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