What is a Hardiness Zone?

Developed by the United States Dept. of Agriculture, these zones are categorized according to the mean of the lowest temperature recorded each winter, termed the “average annual minimum temperature”. Although not perfect, they can be useful for finding other gardeners in similar climatic conditions to yourself.

I know my Australian zone, but not my USDA one.

Use our Australian to USDA Zone converter to find your USDA zone.

How do I find my zone?

Check out the new worldwide What’s My USDA Zone? page – this page calculates your most likely climate zone from your location.