Is Food Safe After a Power Outage? A Fridge and Freezer Guide for Families

The lights flicker, then everything goes quiet. No hum from the refrigerator. If the outage lasts more than a few minutes, one question starts to grow: is the food still safe?

Throwing out good food hurts a family budget. Keeping bad food can make people sick. The good news is that the U.S. Department of Agriculture’s Food Safety and Inspection Service (USDA FSIS) and Ready.gov give clear, practical rules. This guide gathers them in one place so you can plan before an outage, act calmly during one, and decide wisely afterward.

One principle runs through all of it, straight from the USDA: never taste food to determine its safety. When in doubt, throw it out. Smell is not a thermometer either.

Before the power goes out: plan ahead

The USDA recommends a few simple steps that buy you hours of extra safety when an outage comes:

Keep an appliance thermometer in both the refrigerator and the freezer. The refrigerator should be at 40°F or below and the freezer at 0°F or below. After an outage, these thermometers are how you will know what happened inside.
Group foods together in the refrigerator and freezer. This helps them stay cold longer.
Keep the freezer full. Fill empty spaces with frozen plastic jugs of water, bags of ice, or gel packs.
Freeze refrigerated items you may not need right away, such as leftovers, milk, and fresh meat and poultry, to keep them at a safe temperature longer.
Have a large insulated cooler and frozen gel packs available.
Find out where you can buy dry ice and block ice in your area.

Frozen jugs of water do double duty: they keep the freezer cold, and they become drinking water as they thaw.

During the outage: keep the doors closed

The single most important thing you can do is keep the refrigerator and freezer doors closed. Every opening lets cold air escape.

How long food stays safe

According to the USDA:

The refrigerator will keep food safe for up to 4 hours without power.
A full freezer will hold its temperature for approximately 48 hours (about 24 hours if it is half full).

Ready.gov gives the same guidance: the refrigerator keeps food cold for about four hours, and a full freezer keeps its temperature for about 48 hours.

If the outage will be long

If the power will be off longer than four hours, the USDA suggests moving refrigerated food into a cooler with ice or frozen gel packs, keeping it at 40°F or below, and adding ice as it melts. For a prolonged outage, dry ice or block ice can help. The USDA notes that fifty pounds of dry ice should hold an 18-cubic-foot freezer for 2 days. Never touch dry ice with bare hands, and never place it directly against food.

A few more details from the USDA: food in the front of the freezer, in the door, or in small, thin packages thaws faster than large, thick items at the back or bottom. And during a snowstorm, do not put perishable food out in the snow. Outside temperatures vary, and food can be exposed to animals and unsanitary conditions. Instead, fill containers with water, set them outside to freeze, and use that ice in your coolers.

Generator and heating safety: protect your family from carbon monoxide

Outages bring a second danger that has nothing to do with food: carbon monoxide (CO). Ready.gov describes CO as a colorless, odorless gas that can kill you, your family, and pets. Its guidance is clear:

Use generators, camp stoves, and charcoal grills only outdoors, and keep generators and fuel at least 20 feet away from windows, doors, and attached garages.
Never use a gas stove or oven to heat your home.
Install carbon monoxide detectors with battery backup on every level of your home.
Keep a generator dry, connect appliances with heavy-duty extension cords, and let it cool before refueling, since spilled fuel on hot parts can ignite.

If the heat or cold becomes extreme, Ready.gov recommends going to a community location with power. Check with local officials about heating and cooling centers near you.

After the outage: what to keep and what to throw away

Check your appliance thermometers first. Then use the USDA’s lists.

Refrigerator: discard after more than 4 hours without power

The USDA says to throw out the following if your refrigerator has been without power for more than 4 hours:

Raw, cooked, or leftover meat, poultry, fish, eggs, and egg substitutes
Luncheon meat and hot dogs
Casseroles, soups, stews, and pizza
Mixed salads, such as chicken, tuna, macaroni, or potato salad
Gravy and stuffing
Milk, cream, yogurt, sour cream, and soft cheeses
Cut fresh fruits and vegetables, and cooked vegetables
Opened fruit and vegetable juices
Creamy salad dressings
Batters and doughs
Custard, chiffon, or cheese pies, and cream-filled pastries
Garlic stored in oil

The USDA also says to discard opened mayonnaise, tartar sauce, and horseradish if they were held above 50°F for over 8 hours, and any food, like bread or salad greens, that may have been contaminated by juices from raw meat, poultry, or fish. If any food has an unusual odor, color, or texture, throw it out.

Refrigerator foods that are generally safe

The USDA lists foods that usually remain safe, though some may spoil sooner:

High-acid condiments such as mustard, ketchup, relishes, pickles, non-creamy dressings, jams, and jellies
Whole fresh fruits and vegetables, and unopened juices
Dried fruits and coconut
Baked goods such as fruit pies, bread, rolls, muffins, and cakes (except those with cream cheese frosting or cream fillings)
Hard and processed cheeses
Butter and margarine
Fresh herbs and spices, flour, and nuts

These can be used unless they turn moldy or have an unusual odor.

Freezer: what can be refrozen

According to the USDA, you can safely refreeze:

Frozen foods that have thawed but still contain ice crystals
Foods that have stayed at refrigerator temperature, 40°F or below

Their quality may suffer, but they are safe. Ready.gov adds a simple rule: throw away any food that has been exposed to temperatures of 40°F or higher for two hours or more, or that has an unusual odor, color, or texture.

Medicines

Ready.gov notes that if the power is out for more than a day, you should discard any medication that should be refrigerated, unless the label says otherwise, and contact your doctor or pharmacist right away for a new supply. If someone in your home depends on refrigerated medicine or a powered medical device, talk to the provider about a power outage plan now.

Cleaning the refrigerator afterward

If food spoiled, the USDA recommends removing shelves, crispers, and ice trays, washing them in hot water and detergent, and rinsing with a sanitizing solution of 1 tablespoon of unscented liquid chlorine bleach per gallon of drinking water. Wash the interior, door, and gaskets with hot water and baking soda, rinse with the sanitizing solution, and leave the door open for about 15 minutes.

Floods and fires are different

Outages caused by floods or fires carry extra risks. The USDA says do not eat any food that may have come in contact with flood water, and to discard any food that is not in a waterproof container if there is any chance it touched flood water. For fires, the USDA recommends discarding food that has been near the fire, including canned and refrigerated food, because heat, smoke, and fire-fighting chemicals can damage it. Read the full USDA guidance for flood and fire details.

Need help deciding?

The USDA Meat and Poultry Hotline answers food safety questions in English and Spanish at 1-888-674-6854 (1-888-MPHotline). The USDA lists its hours as Monday through Friday, 10 a.m. to 6 p.m. Eastern, with recorded messages available 24 hours a day.

Frequently asked questions

How long is food safe in the fridge without power?

The USDA says the refrigerator keeps food safe for up to 4 hours if the doors stay closed.

How long will my freezer keep food frozen?

A full freezer holds its temperature for about 48 hours, and a half-full freezer for about 24 hours, according to the USDA.

Can I tell if food is safe by smelling or tasting it?

No. The USDA says never taste food to determine its safety. When in doubt, throw it out.

Your one faithful step this week

Buy or find two appliance thermometers, one for the refrigerator and one for the freezer, and fill one empty freezer space with a jug of water. Those two small actions can save both your food and your family’s health the next time the power goes out.

The Good Shepherd