A full freezer will hold a safe temperature for approximately 48 hours (24 hours if it is half full and the door remains closed). Food may be safely refrozen if it still contains ice crystals or is at 40°F (4°C) or below, however, its quality may suffer. Never taste food to determine its safety.
According to FoodSafety.gov, food stored in the refrigerator is still safe to eat for no more than four hours, while a full freezer will keep its temperature for about 48 hours (24 hours if half-full).
Keep the refrigerator and freezer doors closed as much as possible to maintain the cold temperature. The refrigerator will keep food cold for about 4 hours if it is unopened. A full freezer will keep the temperature for approximately 48 hours (24 hours if it is half full) if the door remains closed.
If you refreeze the food after it has been defrosted, the ice crystals will form again, but they may be smaller and not as effective at preserving the food. This can lead to the growth of bacteria and other harmful microorganisms that can cause food poisoning and make you sick.
Safety of Specific Food Products
Hard cheese, butter and margarine: Well packaged products should remain safe; if odors or mold develops, discard the items. Milk products and mayonnaise: Discard if held above 40ºF for more than 2 hours. This category includes milk, cream, yogurt, and soft cheeses.
Do not refreeze any foods left outside the refrigerator longer than 2 hours; 1 hour in temperatures above 90 °F. If you purchase previously frozen meat, poultry or fish at a retail store, you can refreeze if it has been handled properly.
These principles apply to meat, poultry, shellfish, some vegetables and cooked foods. Do not refreeze ice cream and similar frozen desserts. You can cook and eat thawed but still cold food mixtures like casseroles, pot pies, frozen dinners or pizzas but do not refreeze them.
Two hours is the limit for keeping food safe outside the refrigerator or freezer; one hour if the outside temperature is 90 °F ( 32.2 °C) or above. Frozen food can thaw if it is exposed to the sun's rays even when the temperature is very cold.
Cook thawed seafood for consumption or discard. Ice Cream. Do not refreeze melted ice cream. Consume it or discard.
Discard refrigerated perishable food such as meat, poultry, fish, eggs, and leftovers after 4 hours without power. After a power outage never taste food to determine its safety.
How long will milk/eggs last during a power outage? Milk, eggs, fish, meat and leftovers will last four hours in the refrigerator, as long as the door stays closed the entire time.
Throw out perishable foodin your refrigerator (meat, fish, cut fruits and vegetables, eggs, milk, and leftovers) after 4 hours without poweror a cold source. Throw out any food with an unusual odor, color, or texture. Check temperatures of food kept in coolers or your refrigerator with a cold source.
Keep doors to refrigerators and freezers closed to keep cold air inside. Freezers that are part of a refrigerator-freezer combination will keep food frozen for up to a day. A free-standing chest or upright freezer will keep food frozen solid for two days if it is fully loaded.
Refrigerated foods that can be held at temperatures above 40ºF until power returns include: hard cheeses, butter, margarine, fresh fruits, fruit juice, fresh unpeeled vegetables, salad dressing, ketchup, mustard, olives, pickles, jams, jellies and peanut butter.
The most important thing to remember is: keep the refrigerator and freezer doors closed! A refrigerator will keep food cold for about 4 hours if the door is kept closed. A full freezer will keep temperature for about 48 hours (24 hours if half-full).
With your freezer set at the optimal temperature of 0°F, frozen food can be stored indefinitely.
“Frozen foods can remain unspoiled and in pristine condition for days at a time provided that you prepare and pack the food properly. “ Foods stored in low-quality bags do not last a long time, maybe just for a few hours, while a good one can keep food frozen for days when filled with ice.
Discard heated leftovers. Thawed cakes, biscuits, breads, fruits and fruit juices are okay to refreeze once if no strong 'yeasty' smell. Thawed snap frozen meat, poultry or fish is okay to refreeze if still below 4°C or transported and handled safely and spent less than 2 hours in temperature danger zone.
Most foods previously frozen, thawed and then cooked can be refrozen as long as they have not been sitting at room temperature for more than two hours. Remember that freezing does not kill bacteria, only prevents the microbes from multiplying.
The short time limits for home-refrigerated foods will help keep them from spoiling or becoming dangerous to eat. The guidelines for freezer storage are for quality only—frozen foods stored continuously at 0°F (-18°C) or below can be kept indefinitely.
If you return from vacation and find the penny still on top, your freezer's contents remained frozen, and your food should be safe. If the penny has sunk to the bottom, it indicates that the food has defrosted and then refrozen, suggesting that it may not be safe to consume.
Good options include low-sodium canned beans, vegetables, fruit (packed in fruit juice), breakfast cereal, peanut butter, pouches of fully cooked whole grains, nuts, whole-wheat crackers, snack bars, and shelf-stable milk or plant milk (the kind sold in aseptic boxes in the grocery aisle).