What food is safe after a power outage?

UW-Extension Update


There have been few power outages during the past few months, and they can happen with little warning. What about the safety of food in refrigerators and freezers after the power has been out? What if the freezer or refrigerator is disconnected or fails in some way?

Refrigerators

If there has been a power or a system failure of your refrigerator, avoid opening the door. Food should be safe for 4 to 6 hours. Bags of ice placed in the top and bottom of the refrigerator will extend that time considerably. Since the refrigerator has very efficient insulation, do not remove the food to an insulated picnic hamper.

Milk, cottage cheese, fresh meat, poultry or fish will begin to deteriorate as they warm up. After 8 – 12 hour without the addition of ice you will need to discard these items. Leftover meat, gravy or foods containing meat or eggs should be discarded after 8 to 12 hours. Both fresh and hard cooked eggs should be discarded.

Condiments, including ketchup, mustard, salad dressing, soy sauce, steak sauce, jam, jelly and syrups will be safe. Butter, margarine, hard cheeses and peanut butter will be safe. Cheese may begin to mold sooner than normal. If you see mold on the cheese, discard the cheese.

Fresh fruits and vegetables will be usable. Determine their safety by how they look. Discard anything that has spoiled or that has mold.

 




Safe Settings

Refrigerator
The temperature in the refrigerator should be set so the temperature is between 32 and 40 degrees. A small thermometer in the refrigerator will help determine the temperature.

Freezer
A free-standing freezer should be kept at 0 degrees or less – check the temperature with a thermometer. The freezer in a refrigerator will not be as cold as a free standing freezer so food will not remain frozen as long as food stored in a free standing freezer.
 


Freezers

A freezer is extremely well insulated and when it is completely full of food, and will maintain most of the food safely for 24 to 48 hours. A block of dry ice or bags of ice will maintain the freezer even longer. Foods stored on the door shelves will defrost first while food stored under or behind other food packages will remain frozen the longest.

Fruit and vegetables thaw rather quickly, while the density of packages of meat keep the product frozen longer. Food that has ice crystals or is refrigerator cold can safely be refrozen, though quality may vary.

Baked goods will not be of good quality if thawed and refrozen, but will not cause food borne illness. Frozen fruit juice concentrate, candy or nuts can safely be refrozen. Ice cream, pizza, and casserole type foods that have thawed should be discarded.

If you find your freezer door has been left open or the cord has been disconnected, check the food immediately, before you close the door or restart the freezer. Once food has been refrozen, you have no way of knowing whether it was thawed or not.


Top of Page
UW Extension Column Archive

 

Home | About | How To Join | Volunteer | Locations | Email Newsletter
Calendars | Resources | Order Online! | Contact Us | Help | Website Map | Privacy