Safety of Frozen Foods After a Power Failure
Julie Garden-Robinson, Food and Nutrition Specialist
If flood water enters your freezer or refrigerator, dispose of all food not sealed in metal airtight cans or glass jars.
If power is interrupted, or the refrigerator or freezer is not working properly for a short time, keep the door closed to keep cold air inside. This helps prevent food spoilage or thawing. Freezers and refrigerators should be equipped with thermometers.
When anticipating a power failure, set the refrigerator and freezer temperature to the coldest setting to build up a cooling reserve.
Cool hot foods before refrigerating them to minimize rising temperature in the refrigerator.
Foods in the Freezer
With the door closed, food in most freezers will stay below 40 degrees F up to three days, even in summer. Thawing rate depends on:
- The amount of food in the freezer. A full freezer stays cold longer than one partially full.
- The kind of food. A freezer filled with meat stays cold longer than a freezer filled with baked goods.
- The temperature of the food. The colder the food, the longer it will stay frozen.
- The freezer. A well-insulated freezer keeps food frozen longer than one with little insulation.
- Size of freezer. The larger the freezer, the longer food stays frozen.
- Keep the door closed.
- If possible, move food to a locker plant. To move food safely, wrap it in newspapers or blankets, or place it in insulated containers, such as camping coolers.
- If you can't take food to a locker plant, leave it in your freezer and cover the freezer with blankets, quilts, crumpled newspapers or excelsior.
- Use dry ice if it is available. Wear gloves to handle dry ice and proceed as recommended.
When Food has Thawed
You may safely refreeze some foods if they still contain ice crystals or if they have been kept at 40 degrees F or below for no more than two days. If the temperature is above 50 degrees F, throw food away.
Foods that cannot be refrozen but are safe to use may be canned immediately.
Treat completely thawed foods as follows:
- Fruits. Refreeze fruits if they taste and smell good. Fruit that is beginning to ferment is safe to eat but will have an off flavor. Such fruit could be used in cooking.
- Vegetables. Do not refreeze thawed vegetables. Bacteria in these foods multiply rapidly. Spoilage may begin before bad odors develop. Such spoilage may be very toxic. Refreeze vegetables only if ice crystals remain throughout the package. If you question the condition of any vegetables, throw them out.
- Meat and poultry. Examine each package of thawed meat or poultry. If meat has been above 40 degrees F for more than two hours, discard.
- Fish and shellfish. These are extremely perishable. Do not refreeze unless ice crystals remain throughout the package. Seafood may be spoiled, even if it has no offensive odor.
- Ice cream. Do not refreeze melted ice cream.
- Do not refreeze frozen dinners that have thawed.