Sweet potatoes have a normal shelf life in the pantry of approximately 1 month. It is best to only purchase the quantity that you plan to use within that time.
Under ideal conditions and with proper handling, sweet potatoes store in a cool dark place for several months. However, if a potato is bruised, it begins to spoil and the bacterium often spreads and ruins all the sweet potatoes in the container. Canning offers an option other than freezing, but since sweet potatoes are a low acid product, it requires a pressure canner for safety.Learn more about Freezing Food