Most applesauce products do not have preservatives, therefore, they will eventually go bad and should be discarded. Most applesauce containers, whether of the single-serve or jar variety, will have a best-by date, which should be noted before eating.
Unopened containers of applesauce can remain good to eat for up to a year, as long as the containers are kept in a cool dry place, such as in a kitchen pantry at room temperature. Once a container of applesauce is opened, it must be kept in the refrigerator. Once opened, applesauce is still good for up to 10 days. As with anything, if it is unknown how long the applesauce has been refrigerated or if it has an off smell or taste, it should be discarded immediately.