Do diced tomatoes in a can go bad?

According to the USDA, high-acid canned goods, like tomatoes and citrus fruits, will keep for up to 1½ years. ... Canned foods are sterile, so they won't host bacteria, but eventually the taste and texture of the items inside will deteriorate. Keep them at room temperature in a dark place, like a cabinet or a pantry. read more

Tomatoes can also grow mold (mould), in which case they should be tossed. There are many varieties of tomatoes including grape tomatoes, cherry tomatoes, and plum tomatoes. Plum tomatoes seems to last a little longer than all the rest because they have a firmer meat. read more

Botulism is a concern with all canned goods, and tomatoes are no exception. Although the bacteria don't thrive in acidic environments, cases of botulism have cropped up in canned tomatoes. Avoid cans that are dented, leaky, rusted or swollen, and discard those that are foamy, cloudy or foul-smelling upon opening. read more