How Long Does Food Last in the Fridge Without Power?

The short answer: 4, 48 and 24

If the power goes out and the doors stay shut, a refrigerator keeps food safe for about 4 hours. A full freezer holds for about 48 hours. A half-full freezer holds for about 24 hours.

That is the rule most families need, and it is easy to remember: 4 for the fridge, 48 for a full freezer, 24 for a half-full one.

Notice that the freezer gives you far more time than the fridge. That is useful to know on the first evening of an outage, when it is tempting to worry about everything at once. The fridge is the clock to watch. The freezer can wait.

These numbers are guides, not promises. A hot kitchen, a packed or nearly empty appliance, or a door that was open just before the outage can all change what happens inside. That is why we pair the rule with a thermometer, which we cover below.

Keep the doors closed

Closing the doors is the single most helpful thing you can do. Keep the fridge and freezer doors shut as much as possible.

A small family habit helps. Before anyone opens the fridge, decide what you need. Open it once, take everything out in one trip, and close it again. Younger kids can be the "door monitor," which turns a worry into a job.

If the outage is likely to last, plan your meals around food that needs no fridge. Your kit should hold at least a three-day supply of that kind of food, such as canned goods, bars, cereal and peanut butter.

You do not have to buy it all today. Our 72-hour checklist, The Steady 72, lists the basics and scales to your household size.

Use thermometers instead of guessing

An appliance thermometer in the fridge and another in the freezer take the guesswork out. The fridge should read 40°F or below. The freezer should read 0°F or below.

Put the thermometers where you can read them without opening the door, and write down the readings if the outage goes on. A simple log of the time and the temperature tells you a lot when you decide what to keep.

Thermometers are on the basic kit list in our Family Emergency Plan Kit because they cost little and answer the hardest question of an outage: "Is this still safe?"

If you do not have thermometers today, add them to your next shopping trip. They are one of the easiest upgrades for a household.

Here is a simple routine. When the power goes out, write the time on a sticky note and put it on the fridge. Every few hours, read both thermometers, close the doors again and jot down the numbers. Those few lines tell you how long your food has been warm, which is the question that decides what stays.

What to throw out, and what you can keep

Throw out perishable food that has been at 40°F or warmer for more than 2 hours. That includes meat, fish, eggs and leftovers.

Never taste a food to decide whether it is safe. The official guidance is short and kind to your nerves: when in doubt, throw it out.

Some food can be kept. Food that still has ice crystals in it, or that is at 40°F or below, may be refrozen.

It can feel wasteful to toss a full fridge, and that is a normal feeling. Clear rules are a relief here: you do not have to judge each item, you only have to follow the clock and the thermometer.

Meat, fish, eggs and leftovers are the examples official guidance gives. If you are unsure about another item, treat it the same way. Check the time and the temperature, and ask whether it has been at 40°F or warmer for more than 2 hours.

Stretching the time in a longer outage

For a long outage, ice can help. About 50 pounds of dry ice should keep a full 18-cubic-foot freezer cold for two days. Follow the seller's safety directions when you handle it.

Block ice also helps keep things cold longer.

Think of these as extras, not the plan. The plan is simple: keep doors closed, watch the thermometers, and lean on shelf-stable food from your 72-hour kit.

If power cuts are common where you live, consider our power outage preparedness checklist and the longer outage checklist template. They show how food fits into a bigger, calmer plan.

One small habit helps in any outage. Keep a short list on the fridge door of what your family would eat first from the no-cook shelf, such as bars, cereal, peanut butter and canned fruit. When the fridge is a question mark, you already have a calm plan for the next meal.

When the power comes back

Plug your appliances back in one at a time.

Then check the thermometers and use the same rules as above. Perishable food that spent more than 2 hours at 40°F or warmer goes in the trash. Food with ice crystals or at 40°F or below can usually stay.

If anyone in your home uses a medicine that needs to stay cold, ask your pharmacist what to do about doses that may have warmed during the outage. Do not guess.

Finally, write down what you learned. Which food did you wish you had? Did you have thermometers? A five-minute note now makes the next outage easier.

Take a quick walk-through. Check the thermometers, look at the food, and reset anything that lost power. Then update your kit: restock the no-cook food you used and swap the flashlight batteries. It takes about ten minutes and leaves you ready for next time.

FAQ

How long does food last in a fridge without power?

About 4 hours if the door stays closed. After that, perishable food such as meat, fish, eggs and leftovers should be thrown out if it has been at 40°F or warmer for more than 2 hours.

Can I refreeze thawed food?

Food that still has ice crystals, or that is at 40°F or below, may be refrozen. Food that has been above 40°F for more than 2 hours should be thrown out.

How long does a full freezer stay safe?

A full freezer holds for about 48 hours with the door closed. A half-full freezer holds for about 24 hours. Thermometers let you check without guessing.

General information only, not medical, legal or other professional advice. No plan or checklist can guarantee safety. Always follow your local emergency officials, and call 911 in an emergency. Read the full disclaimer.