Frozen Food and Power Outages: When to Save It and When to Throw It Out. A full freezer will hold a safe temperature for approximately 48 hours (24 hours if it is half full and the door remains closed).
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.
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).
Foods from the freezer:
If the food still contains ice crystals or is at 41 °F or below, the food is safe. If a thermometer has not been kept in the freezer, then check each package of food to determine its safety. If the food still contains ice crystals, the food is safe.
To keep your frozen food good during a power outage, follow these tips: Keep the Door Closed: Avoid opening the freezer door. A full freezer can keep food frozen for about 48 hours (24 hours if half-full). Use Ice Packs: If possible, place ice packs or bags of ice in the freezer before the outage.
As the USDA notes in Keeping Food Safe During an Emergency, your refrigerator will keep food safe for up to 4 hours during a power outage. Keep the door closed as much as possible. Discard refrigerated perishable food such as meat, poultry, fish, eggs, and leftovers after 4 hours without power.
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.
Frozen food will remain safe indefinitely if frozen properly.
Salad dressing, ketchup, mustard, olives, pickles, jams, jellies and peanut butter: May be kept unrefrigerated until power returns. Mixed food items, including cooked pasta, stews, casseroles, soups, potatoes, custards and puddings: Discard if held above 40°F for more than 2 hours.
If food is partly frozen, still has ice crystals, or is as cold as if it were in a refrigerator (40 °F), it is safe to refreeze or use. It's not necessary to cook raw foods before refreezing. Discard foods that have been warmer than 40 °F for more than 2 hours.
General Food Safety of Refrigerated Foods
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.
Keeping the Refrigerator Chilled
Food in the refrigerator will remain cold for about 4 hours if the door stays shut. Eat the most perishable items first, such as leftovers, meat, poultry, and foods containing milk, cream, sour cream, or soft cheese.
Discard Times for Frozen Foods After Power Outage
When the power comes back on, check the thermometer. If it reads 40˚F or below, the food is safe and can be refrozen. Otherwise discard it.
TWO HOURS is the MAXIMUM time perishable foods should be at room temperature (ONE HOUR at temperatures 90 degrees F and higher).
After four hours without power, throw out perishable foods in the fridge, such as meat, fish, cut fries and vegetables, eggs, milk and leftovers. After 24 hours, throw out perishable foods in the freezer. Throw out foods with strange odors, colors, or textures.
Keep fridge and freezer doors closed as much as possible
Your fridge should stay cold for up to 4 hours. The food in your freezer should stay frozen for up to 48 hours in a full freezer (or 24 hours if it's half full), but these are estimates.
Hard cheeses, like cheddar or swiss, are safe to keep in brick form. Soft cheeses and hard cheeses that have been shredded should be tossed if they were kept above 40 degrees Fahrenheit for 2 hours or longer.
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 food is partly frozen and still has ice crystals, then it is safe to refreeze or use. Discard food that has been warmer than 5 °C for more than two hours.
Allow 2½ to 3 pounds of dry ice per cubic foot of freezer space. More will be needed in an upright freezer because dry ice should be placed on each shelf. Leave the freezer door closed. Frozen foods that have reached temperatures of 40 °F and above for more than two hours are not safe to eat.
The USDA said refrigerators will keep food safe for up to four hours during a power outage. After that, perishable food such as meat, poultry, fish, eggs and cooked leftovers should all be put in the garbage. Get top local stories in DFW delivered to you every morning with NBC DFW's News Headlines newsletter.
Based on the recommendations of USDA, uncooked chops, steaks, or roasts can remain in the freezer within four to 12 months, and uncooked ground beef lasts around four months.
Things like butter or margarine, fresh fruits that are uncut, fruit juices, peanut butter, ketchup and jelly are safe to eat after four hours without power. You can get a more detailed list of what refrigerated foods you should keep and what foods you should throw away by looking at the chart below.