I live in the capital region of New York. My mini rose bushes lasted a few years, but not forever. I planted in mid-May. Of course, I never covered them up in the winter either. So give it a try and maybe you will be lucky!
I wouldnt plant them in April. I live in Northeastern PA. We are in USDA Hardiness zone of 5B. We don't plant anything outside here until Memorial Day. It's wet here and plants rot. Be sure to wait til all threat of frost is past.
I guess you realize your rose bushes wont last over the winter in NY. They are hardy to zone 7a. They might be beautiful for the summer similar to an annual flower though. I'm not sure. Good luck
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