Can see clarify Toronto climate zone – (see attachment from your website)? I live in the upper beaches .
Thank you for your question. The topic of plant hardiness zones can be confusing as both Canada and the United States have their own zone maps (detailed in the ASK response you found on the Toronto Master Gardeners website).
Hardiness zone maps have been updated over time to reflect changes in models. According to the USDA Climate Hubs website, climate change has contributed to these changes.
Natural Resources Canada has a website that uses data from the Canadian Hardiness Zones map where you can find out the Plant Hardiness Zone by Municipality. On this platform, Toronto is listed as 7a.
Another website, Plantmaps, uses data from the USDA Hardiness Zones map and lists Toronto as zone 6b and the Toronto Islands as zone 7a.
Your location in the upper Beaches area would be considered zone 7a on the Canadian Hardiness Zone map or zone 6b on the USDA Hardiness Zone map. I hope this provides the clarification you requested.
May 20, 2024