• Krista Green

What are Plant Zones?

Updated: Sep 27

To put it simply, plant hardiness zones mean how cold it gets where you live at its coldest. This also plays into how long or short our growing season is.

I feel this is important to us in colder zones as we have a much more challenging time than the warmer areas of earth, growing vegetables that produce well in a short growing season. This means we need to start plants that take longer, like peppers and tomatoes, indoors early in the spring. In Alberta we range from zone 0 to 4. When you purchase a perennial (it is meant to come back each year) ALWAYS check what zone it is for. Many times I have been at the more common stores and picked up a tree, shrub or perennial flower only to look at the tag and see it labeled zone 5 or 6. Don't expect that to live through a cold climate winter! To figure out what zone you are in, all you need to know is how cold it gets at its coldest where you live. Here is a breakdown of each plant hardiness zones lowest temperature:


Zone From To 0 - 53.9C (-65F) 1 -51.1C (-60F) - 45.6C (-50F) 2 -45.6C (-50F) - 40C (-40F) 3 -40C (-40F) - 34.4C (-30F) 4 -34.4C (-30F) - 28.9C (-20F) 5 -28.9C (-20F) -23.3C (-10F) 6 -23.3C (-10F) -17.8C (0F) 7 -17.8C (0F) -12.2C (10F) 8 -12.2C (10F) -6.7C (20F) 9 -6.7C (20F) -1.1C (30F) 10 -1.1C (30F) +4.4C (45F) 11 +4.4C (45F) +10C (50F) 12 +10C (50F)

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