Is four year old frozen chicken a health hazard to eat?

Frozen chicken that has been properly stored at 0°F (-17.8°C) or lower can be eaten longer than four years as long as it is cooked to the proper internal temperature of 165°F (73.9°C).

However, it's important to consider the quality and taste of the chicken. After this time, frozen chicken may suffer from freezer burn, which is the loss of moisture and flavor due to prolonged exposure to low temperatures. Additionally, the texture of the chicken may become tougher, and it may not be as palatable as when it was fresh.

If the frozen chicken has any signs of spoilage, such as discoloration, off-odor, or slimy texture, it should not be consumed.