In a zone 3 garden, it would be ideal to wait until spring. That way the roots can grow all summer long and get established before winter. If you can’t wait until next spring, the best time to transplant your Campfire Rose bushes really depends on the weather. I like to plant and transplant when the temperatures are mild and right before a rainy spell. A couple of resources to help with transplanting – planting and care guide and Easy Elegance rose planting and care.
Thanks for writing!