What is the most hardy pink rose that blooms from summer on through fall in Toronto?
Hello. Thanks for your question.
There are so many different shades of pink, flower shapes, growth habits, sizes, scented or not etc., that it’s impossible for me to recommend one or two roses above all others. The Explorer and Parkland series of rose varieties were specially developed to survive the Canadian winters by Agriculture and Agri-Food Canada (AAFC) at Morden Research Station in Manitoba. They are exceptional for their hardiness in Canada. They require minimal care and are environmentally friendly, needing minimal sprays. They are hardy down to -35 C with only snow as protection, are disease resistant, flower repeatedly throughout the summer, require only minimal pruning and come in a variety of colours and sizes.
I have attached a few links with examples of hardy roses so you can get an idea of the variety available.
https://www.canadianliving.com/home-and-garden/article/10-hardy-roses-to-plant-in-your-garden
https://www.cornhillnursery.com/Roses.html