Do I need to refrigerate beef tallow?
Tallow does not need to be refrigerated and can last a year or longer. I would not worry greatly about decomposition, but oxidation can be a problem. Make sure to store it in an airtight container and you shouldn't have a problem. you can even preserve a lot of foods by plopping them in the tallow before jarring it.
How long can tallow be stored?
Shelf life is 12-18 months when refrigerated. Tallow can be kept in your pantry and is naturally shelf stable for years. Tallow may also be kept refrigerated but will solidify, requiring a hot water bath to soften it.