Ginger does not have to be peeled before grating, but it should be washed thoroughly and scrubbed clean. Whether or not to peel ginger root comes down to personal preference; some recipes may require a smooth texture or appearance, and in those cases, it would be best to peel the ginger root.
Ginger root can be kept in a sealed bag in the refrigerator for several weeks, or it can be washed and kept sealed in the freezer. The ginger root can be grated in its frozen state as needed. A tablespoon of fresh, grated ginger root can replace 1/8 teaspoon of ground ginger in recipes.