May I transplant Brunnera "Jack Frost" in the fall? It had too much sun where I planted it last spring. I live in Massachusetts, zip 02043.
I would usually recommend planting these in spring for the best results. If you plant now, you may lose some or all of them, however some will likely survive. To give them the best chance they should be propagated in spring. Here is an article for more information about these plants: https://www.gardeningknowhow.com/ornamental/flowers/brunnera/growing-brunnera-plants.htm