Ice cream can go bad over time, especially if it is exposed to temperature fluctuations that cause freezer burn or bacterial growth. Unopened ice cream usually lasts for two to three months in the freezer, while opened containers are best consumed within six weeks. Look out for unpleasant odors, an icy texture, or dark mold spots to determine if your ice cream has spoiled. Storing it at a consistent freezing temperature helps maintain its creaminess and safety.