The precise answer to the question “How long does brown sugar last?” depends to a large extent on storage conditions — when properly stored and kept free from contaminants, brown sugar has an indefinite shelf life.
To maximize the shelf life of brown sugar, store in a cool dry area and keep tightly sealed after opening.
To prevent brown sugar from hardening once opened, place sugar in a covered airtight container or cover original package with a heavy-duty plastic bag and seal.
To moisten brown sugar that has hardened, place a cut piece of apple in the package with the sugar, reseal and leave overnight.
If hardened brown sugar is needed immediately, wrap the sugar with foil or plastic wrap and pound with a hammer.
Sources: For details about data sources used for food storage information, please