How Long Does Food Last in the Fridge Without Power? What to Keep and What to Toss

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How long does food last in fridge without power? The official answer is short: about 4 hours, as long as you keep the door closed. A full freezer holds a safe temperature for about 48 hours, and a half-full freezer for about 24 hours. Those numbers come from the USDA, FoodSafety.gov and the CDC, and everything else in this guide builds on them.

Below you’ll find the 40°F rule, a clear keep-or-toss list for the fridge and freezer, and simple ways to buy yourself more time, so you never have to search “how long does food last in fridge without power” in the dark again.

How long does food last in fridge without power? The 4-hour rule

FoodSafety.gov, citing the USDA, says your refrigerator will keep food safe for up to 4 hours during a power outage. Keep the door closed as much as possible. After 4 hours without power, discard refrigerated perishable food such as meat, poultry, fish, eggs and leftovers.

The freezer does much better because frozen food acts like a block of ice:

• Full freezer: about 48 hours with the door closed.
• Half-full freezer: about 24 hours with the door closed.

That’s the whole reason to keep the doors shut. Every peek lets cold air out and shortens the clock.

The 40°F rule: why temperature matters more than time

The 4-hour figure is a guide. The fuller answer to how long does food last in fridge without power is “until it has been too warm for too long,” so the real test is temperature. The CDC says your refrigerator should be at 40°F or below and your freezer at 0°F or below, and recommends keeping an appliance thermometer in each so you know for sure.

FoodSafety.gov’s keep-or-toss chart is based on one line: has the food been at 40°F or above for more than 2 hours? Ready.gov uses the same rule after an outage, and adds that you should toss anything that smells, looks or feels unusual.

Two rules never change: never taste food to decide if it’s safe, and when in doubt, throw it out.

Power outage food safety: what to throw out from the fridge

According to the FoodSafety.gov chart, discard these if they have been above 40°F for more than 2 hours:

• Raw or cooked meat, poultry, fish and seafood, plus soy meat substitutes
• Lunchmeats, hot dogs, bacon, sausage and dried beef
• Meat, tuna, shrimp, chicken or egg salads
• Casseroles, soups, stews, gravy, stuffing and broth
• Pizza with any topping
• Milk, cream, sour cream, buttermilk, yogurt, eggnog and soy milk
• Soft cheeses (such as Brie, cottage, cream cheese, mozzarella and ricotta), shredded cheeses and low-fat cheeses
• Fresh eggs, egg dishes, custards, puddings and quiche
• Opened baby formula
• Cut fresh fruit, cut vegetables and pre-washed packaged greens
• Cooked pasta, rice and potatoes, plus potato and pasta salads
• Opened spaghetti sauce, creamy dressings, fish sauce and oyster sauce
• Cheesecake, cream-filled pastries and refrigerator dough

What you can usually keep

The other half of the “how long does food last in fridge without power” question is what you can keep. The same chart lists these as safe to keep after more than 2 hours above 40°F:

• Hard cheeses such as cheddar, Colby, Swiss, Parmesan, provolone and Romano, plus processed cheeses
• Butter and margarine
• Uncut fresh fruits and vegetables, fresh mushrooms and herbs
• Opened fruit juices and opened canned fruits
• Peanut butter, jelly, relish, mustard, ketchup, olives and pickles
• Worcestershire, soy, barbecue and hoisin sauces, and opened vinegar-based dressings
• Bread, rolls, cakes, muffins, tortillas, waffles, pancakes, bagels and fruit pies

One in-between item: opened mayonnaise, tartar sauce and horseradish should be discarded if they were above 50°F for more than 8 hours.

How long does food last in freezer without power?

A full freezer keeps food safe for about 48 hours, or about 24 hours if half full. When the power comes back, FoodSafety.gov says food may be safely refrozen if it still contains ice crystals or is at 40°F or below, though the quality may suffer.

If food thawed and sat above 40°F for more than 2 hours, the chart says to discard meat, poultry, seafood, soups, stews, casseroles, frozen meals, soft cheeses and anything with custard or cheese filling. Ice cream and frozen yogurt should be discarded either way. Breads, flour, nuts, hard cheeses and plain fruit juices can still be refrozen.

How to make your food last longer in an outage

You can’t change the official answer to how long does food last in fridge without power, but you can make sure you get every minute of it.

1. Keep the doors closed. Decide what you need before you open the fridge, and open the freezer as little as possible.
2. Freeze water ahead of time. The CDC suggests freezing containers of water and gel packs. They fill empty freezer space and keep things colder longer.
3. Have a cooler ready. If the power has been out for 4 hours, the CDC says to move refrigerated perishables to a cooler with ice or frozen gel packs and keep them at 40°F or below.
4. Buy ice early. If the outage could last a long time, the CDC suggests getting dry ice or block ice. Stores sell out fast once a storm hits.
5. Eat in order. Use perishables from the fridge first, then freezer food as it thaws, then shelf-stable food.

Don’t forget medicine. The CDC says if the power was out for a day or more, throw away refrigerated medication unless the label says otherwise, and contact your doctor or pharmacist about a new supply.

Plan B: food that doesn’t need a fridge at all

How long does food last in fridge without power? Not long enough to count on in a multi-day outage. That’s why a stash of shelf-stable food matters. Our prepper pantry essentials guide and emergency food supply list cover canned and dry staples, and our power outage emergency kit list covers the rest.

Long-shelf-life meals are the simplest backup because they only need water and heat:

• The 1-Week Food Supply Ammo Can provides 14,860 calories (2,000+ per day for one person for a week), with a listed shelf life of up to 25 years when stored properly.
• The 4-Week Emergency Food Supply feeds one person for four weeks, two people for two weeks, or a family of four for one week.
• The 3-Month Emergency Food Supply feeds one person for three months, two people for six weeks, or a family of four for three weeks, and needs about 36 gallons of water to prepare everything.

These meals need hot water, so plan your heat source too. The VESTA Self-Powered Indoor Space Heater & Stove is both a heater and a stove, needs no electricity, and the maker says it is designed for indoor use with adequate ventilation. More options are in our guide to emergency cooking without power.

If you’d rather keep the fridge itself running, you need a battery system sized for it. The Grid Doctor 3300 Solar Generator has 3300W continuous output and a 2048Wh battery that expands up to 16,384Wh, and the maker lists multi-day outages where refrigeration matters among its intended uses. Small power stations built for phones and lights won’t do the job.

Food is on a lot of minds this fall. The Pentagon’s FORTRESS America initiative, announced September 30, aims to make major U.S. bases run on their own power, and Britain has urged families to keep food and water at home. You don’t need to expect the worst to see the value in a pantry that doesn’t depend on the grid.

For what causes a widespread blackout and what happens hour by hour, see our guide to power grid failure.

Want to go deeper? Read How Long Will MRE Last? Shelf Life by Temperature, Date Codes and Signs of Spoilage.

For more on this, see our guide: Best Emergency Candles for Power Outages.

Frequently asked questions

Is food safe after 6 hours without power?

Not perishable refrigerated food. The answer to how long does food last in fridge without power is 4 hours, and after that FoodSafety.gov says to discard refrigerated perishables such as meat, poultry, fish, eggs and leftovers. Items on the keep list, like hard cheese, butter and condiments, are usually fine.

Can I refreeze food that thawed during a power outage?

Yes, if it still has ice crystals or is at 40°F or below. Quality may suffer, but it is safe.

How long does food last in fridge without power if I never open it?

About 4 hours. Keeping the door closed is what makes that number possible. A thermometer reading of 40°F or below tells you for sure.

Can I tell if food is safe by smelling it?

No. Never taste food to check it, and don’t rely on smell alone. Throw out anything that smells, looks or feels unusual, and use the 40°F and 2-hour rules for the rest.

The bottom line

So, how long does food last in fridge without power? About 4 hours with the door shut. Remember three numbers: 4 hours for the fridge, 48 hours for a full freezer and 40°F as the line you don’t cross for more than 2 hours. Keep the doors shut, keep a thermometer in each, and keep shelf-stable food on hand so a dead fridge never means an empty table.

Sources: FoodSafety.gov: Food Safety During Power Outage, CDC: Keep Food Safe After a Disaster, Ready.gov: Power Outages, CDC: Protect Yourself During a Power Outage, Snopes, Fortune. Product details are from My Patriot Supply product pages as of October 27, 2026.