Berry plants in a snowstorm

My blueberry and blackberry bushes got covered in the snow over the weekend. Although the marshmallow like blanket of snow that the storm left behind on the shrubs may look cold, I'm actually hoping the small layer of snow will keep the plants warm the next few nights as temps dip down into the single digits!!! Snow can be an insulator and keep temps slightly warmer! With single digit temps I'm not sure my rosemary bush will make it through the winter but you never know!