Hi,

The best time to plant any rose is Spring. The cut off time for me is early September. That way the roots have time to grow before it freezes, and dont have to worry about winter killing it. I would buy from Nor'East miniature roses, John's is not too reliable. You'll get better quality plants from Nor'East. Maybe you can decide what you're ordering now and order in Spring. Also, minis are a good choice-they are pretty hardy. Have fun :)

Jen

We planted 180 potted mini roses in October last year. Almost all of them with a few exceptions came through the winter just fine in our very cold Zone 5 area of upstate New York.
While spring is most likely the best time to plant, just about anytime the ground is friable and you can give your plants extra water during hot spells is the right time to plant minis.
We've done business with Nor'East for nearly 30 years now and I always recommend their roses. Best service and plants in the business!
Meg