However, as soon as they begin to thaw and become warmer than 40 °F, bacteria that may have been present before freezing can begin to multiply. Perishable foods should never be thawed on the counter, or in hot water and must not be left at room temperature for more than two hours.
Any foods that can go bad -- like raw or cooked meat, poultry, and eggs -- must thaw at safe temperatures. When frozen food gets warmer than 40 degrees or is at room temperature for more than 2 hours, it's in the danger zone where bacteria multiply quickly.
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.
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.
How long after defrosting my freezer must I wait before turning it on again and putting foods back in? Once you have defrosted your freezer and switched back on the power, you can store frozen foods straight away.
Defrosting Food
You should defrost your food in the fridge so that it doesn't get too warm, see our Danger Zone info below for why this is important. It's also important to use food within 24 hours after it's been fully defrosted – it will go bad in the same way as if it were fresh.
Depending on ambient temperature and food loads, this usually takes several hours, but can vary from appliance to appliance. Once the freezer is ready, you can take your food out of the cooler and put it back in your appliance.
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.
Bacteria can grow rapidly on food left out at room temperature for more than 2 hours. If food is left out in a room or outdoors where the temperature is 90 degrees F or hotter, food should be refrigerated or discarded within just 1 hour. Myth: When I microwave food, the microwaves kill the bacteria.
How long does it take to defrost a freezer? Depending on the freezer you have, and how much frost/ice build-up there is, defrosting your freezer can take anything between 2 hours and 24 hours to defrost naturally. That time can be cut if you use any of the methods mentioned above to help thaw the ice.
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.
However, as soon as they begin to thaw and become warmer than 40 °F, bacteria that may have been present before freezing can begin to multiply. Perishable foods should never be thawed on the counter, or in hot water and must not be left at room temperature for more than two hours.
I accidentally left frozen veggie burgers out for 2 hours after I got home from the store before I put them in the freezer. Are they still safe to eat? If they were safe when you bought them, they'll certainly be just as safe after 2 hours. In that period of time they may have just thawed slightly, but still be cold.
Can You Thaw Food at Room Temperature? The short answer is no. “As food left out at room temperature for too long can potentially cause illness, the USDA, FDA and CDC recommend consumers follow the '2 hour rule,'” Amidor explains.
In order to ensure that you kill off any and all bacteria before consuming meat, poultry, or even vegetables, you need to cook it thoroughly.
Food held between 5oC and 60oC for less than 2 hours can be used, sold or put back in the refrigerator to use later. Food held between 5oC and 60oC for 2-4 hours can still be used or sold, but can't be put back in the fridge. Food held between 5oC and 60oC for 4 hours or more must be thrown away.
Foods thawed by the cold water method or in the microwave should be cooked immediately after thawing. Never thaw foods in a garage, basement, car, dishwasher or plastic garbage bag; out on the kitchen counter, in hot water, outdoors, or on the porch. These methods can leave your foods unsafe to eat.
The best plan is to put leftovers in the refrigerator right after your meal. Food that is sitting out for a party or picnic should be chilled after two hours at typical room temperature. If it's above 90 degrees Fahrenheit (32 degrees Celsius) or more, food should not sit out for more than one hour.
The following food should be tossed if the frozen food has been exposed to temperatures that have reached 40 degrees Fahrenheit or higher for more than two hours: Meat, poultry and seafood. Soups, stews and casseroles. Dairy and egg products.
Throw away any refrigerated food that has been exposed to temperatures 40 degrees Fahrenheit or higher for more than 4 hours. Throw away refrigerated food that has an unusual odor, color or texture. Throw out perishable food in the refrigerator after 4 hours without power.
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.
Wait for the freezer to defrost. This can take several hours. Do not try and speed up the process and do not use sharp objects to remove ice. Whilst the freezer is defrosting, quickly clean the appliance's interior using a damp cloth.
Freezers. Do NOT open the freezer unnecessarily if power is interrupted or the freezer fails to operate properly. The food will stay frozen about 2 days if the freezer is filled with food and you keep the door closed. If the freezer is not full, group packages together so they stay cold longer.
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.