Do Emerald cedars need to be wrapped for winter?
Wrapping cedars is not generally necessary. If you are worried about cedar branches that may sustain damage or be broken from ice, heavy snow or strong winds, winter protection can be considered. Wrapping the plant tightly is not recommended as it may dry the tree out and not allow any air to circulate. You could install 3 bamboo stakes around the tree and wrap burlap loosely around the stakes for protection. Watering the cedars well until the ground is frozen is recommended as this will allow roots to take up moisture to get them through the winter.
Also, this article, below, from Landscape Ontario on winter protection, may be of interest.