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There is indeed hope. I live in Northern Colorado where we get cold winter temps and dry cold windy conditions. Not as cold as where you are but it is possible to grow and enjoy roses in your climate. Here is a link to an article on this subject for you: https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-winter-care.htm . Water the rosebushes with some water that has a product called Super Thrive in it several times prior to the onset of the winter season there. It will help them deal with the extreme cold of the winter dormant period.

First things first. It is not an insect but rather a Virus called Rose Rosette that infects some roses causing mottled and mutilated redish growth. The virus/disease is believed to be spread by tiny mites. Spraying the rosebushes with a miticide such as Avid or Floramite will help keep them safe. The new growth on rosebushes, including Knock Outs can be different looking and be a rich deep red or maroon color, it is actually very pretty and nothing to worry about. The infected growth has a mutilated look to it, twisted and looking similar to an old broom which is why it is also sometimes called Witches Broom. The sad and heartbreaking thing about rose rosette is, once infected, there is no cure for it. The rose is doomed and will die, this cane take a long period of time or can be rather quickly. My advice is that if you Know For Sure that the rosebush has rose rosette, you are doing yourself and other rosebushes a favor by getting rid of those infected.

What should you do? Pray to the garden spirits. First you need to create shade for the plants. Any tall box or leaf bag on sticks/stakes will do. Next, water only when soil is dry. Did you reduce the overall size of the plant before you dug it up? I would definitely do this even though it's a bad time of year to prune roses. Some winter kill of new growth is better than losing the entire plant. You may have cut off many of the small feeder roots when you dug the plants up so they are unable to support the amount of top growth. It takes time to make new roots and drowning them won't help. Don't fertilize; the plant is in enough trouble without being told to grow more leaves. As the saying goes, next time look before you leap.

They probably need a heavy pruning to rejuvenate them. I would give all of the some water that has both a product called Super Thrive and root stimulator in the same water. Water them with a fresh batch of this mix the next 4 to 5 times they need watering. I would also give them all 1/3 cup kelp meal, scratch it into the soils and water in. You can use the same water mix noted above to water in the kelp meal.

Typically when this happens it is due to Thrips on the roses. They are very tiny and hard to spot. I suggest the use of either a systemic spray or systemic granules to get them. Check the insecticide label and make sure Thrips are listed. Since they get into the buds it is very hard to get at them with anything other than a systemic which moves through the rosebushes in their own natural juices.