How do you know when frozen tomatoes are bad?

* The color has changed. Frozen tomatoes should be a deep, vibrant red. If they have started to turn brown or yellow, they are likely past their prime.

* The texture has changed. Frozen tomatoes should be firm and slightly icy. If they have become soft or mushy, they are likely bad.

* The smell has changed. Frozen tomatoes should have a fresh, tomato-like smell. If they have started to smell sour or off, they are likely bad.

* The taste has changed. Frozen tomatoes should taste sweet and slightly tart. If they have become bland or watery, they are likely bad.

If you are unsure whether or not your frozen tomatoes are bad, it is best to err on the side of caution and discard them.