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Zone 6. It is based on the historical average climatic conditions of each area and as such is intended as a general guide. No consideration is given to the possibility of future climate change, which is extremely difficult to predict. Toronto is considered to lie within Zone 6 and 'downtown' Toronto, including areas closer to Lake Ontario, is in the milder range of that zone. There are many examples of Torontonians successfully growing plants which have traditionally been considered too tender for these conditions. For a complete list of hardiness zones try Plantswatch. Plantswatch is a unique plant guide divided into plant colors and plant hardiness zones. Contains a handy reference guide to make it easy to choose your plants according to your climate zone. It's a complete and easy to use gardening solution swatchbook. See website at: www.plantswatch.com

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Q: What is the cold hardiness zone for Toronto?
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