Yes! You can freeze homemade cashew milk. You can freeze in ice cube trays, then transfer to a freezer bag or airtight container to store. This will give you easy access when you need a milk for cooking, iced coffee creamer, or your morning granola.  I recommend measuring out how many teaspoons/tablespoons are in each ice cube mold before freezing. That way you can mark it on your container and know how many cubes you will need to thaw before using.