The last four articles in this silo covered how long specific foods last once they’re stored correctly: chicken, beef, rice. This one covers what happens when storage breaks down, when food sits out too long, or the power goes out and the fridge stops doing its job. The rules on this page apply to everything else in the kitchen, not just the foods named here.
The quick answer
These five numbers matter more than any single food’s shelf life. Everything else on this page explains why they’re the numbers they are.
| Situation | Time limit |
|---|---|
| Cooked or perishable food left out at room temperature | 2 hours |
| Same food left out above 90°F (hot car, tailgate, outdoor buffet) | 1 hour |
| Fridge with no power, door kept closed | 4 hours |
| Freezer with no power, full and door closed | 48 hours |
| Freezer with no power, half full and door closed | 24 hours |
What the danger zone actually means
Between 40°F and 140°F, bacteria that cause foodborne illness grow fastest. USDA FSIS puts a number on how fast: at the warmest point in that range, some bacteria can double in as little as 20 minutes. Two hours at room temperature isn’t a cautious guess rounded up for safety. It’s roughly six doubling cycles for whatever was already on the food before it went into the fridge. Keeping hot food at or above 140°F and cold food at or below 40°F isn’t about texture or taste. It’s the only way to stay outside that window.
The two-hour rule, and the one-hour exception
USDA’s rule is specific: never leave perishable food out of refrigeration for more than two hours. Cut that to one hour if the air temperature is above 90°F, a parked car in July, a tailgate, food left on a counter near an open window in August. USDA FSIS This is the same clock that governs a rotisserie chicken picked up from a deli counter, covered in our guide to how long chicken lasts, and it applies just as strictly to a bowl of pasta salad left on a picnic table. The rule doesn’t care what the food is. It cares how long it sat between 40°F and 140°F.
How long food lasts in the fridge without power
A refrigerator keeps food safely cold for about four hours after the power goes out, as long as the door stays shut. USDA FSIS, FoodSafety.gov Guidance after that point is direct: discard raw or leftover meat, poultry, fish, eggs and most cooked dishes rather than gamble on smell or appearance. The four-hour window assumes the door stays closed the whole time. Every check-in to peek at the thermometer or grab a snack lets warm air in, and the clock effectively resets for whatever’s sitting near the door.
What to keep and what to toss after a fridge outage
Not everything in the fridge follows the same clock. Butter, hard cheese and most condiments hold up fine well past four hours, while milk, soft cheese and anything containing raw egg don’t get a grace period at all.
| Food | After 4+ hours above 40°F |
|---|---|
| Raw or cooked meat, poultry, fish | Discard |
| Milk, cream, yogurt, soft cheeses | Discard |
| Hard cheeses (cheddar, parmesan, Swiss) | Keep |
| Butter and margarine | Keep |
| Fresh eggs and egg dishes | Discard |
| Opened mayonnaise, above 50°F for 8+ hours | Discard |
| Peanut butter, jelly, mustard, ketchup | Keep |
| Fresh fruit, whole | Keep |
| Fresh fruit or vegetables, cut | Discard |
| Cooked pasta, rice or potatoes | Discard |
| Bread, rolls, tortillas | Keep |
How long food lasts in the freezer without power
A full freezer holds a safe temperature for about 48 hours without power, door closed. A half-full one holds for about 24 hours, since there’s less frozen mass acting as thermal ballast. FoodSafety.gov Food that still contains ice crystals, or reads 40°F or below on a thermometer, is safe to refreeze. It will lose some texture, especially in produce and dairy, but that’s a quality problem, not a safety one. Meat, poultry and seafood that thawed completely and climbed above 40°F are a different case. Cook them right away if the timeline is clear, or throw them out if it isn’t. Refreezing raw meat that already spent hours in the danger zone doesn’t undo whatever grew during that time.
What to do the moment the power goes out
Keep the doors shut
Every check-in lets warm air in. A fridge opened once during a four-hour outage stays colder than one opened every twenty minutes to see how things are going.
Group the freezer together
Push loose items into a single block if there’s room. Food packed tightly holds its temperature far longer than the same food spread across half-empty shelves.
Have a cold backup ready
A cooler with ice, or dry ice for anything longer than a day, buys time for what matters most: raw meat, dairy, anything that was already thawing.
Watch the thermometer, not the clock
An appliance thermometer kept in the fridge and freezer year-round turns a guess into an actual reading once the power comes back.
Check before you eat, not after
When power returns, check the thermometer before checking the food. Anything that sat above 40°F for more than four hours in the fridge, or thawed completely in the freezer, gets thrown out regardless of how it looks.
The bacteria responsible for most food poisoning don’t reliably change how food smells, looks or tastes. FoodSafety.gov’s advice after any outage is blunt: never taste food to decide whether it’s safe. If the time limits above have passed, the safer call is to throw it out without testing it.
Frequently asked questions
What is the temperature danger zone for food?
The danger zone is 40°F to 140°F (4°C to 60°C), according to USDA FSIS. Bacteria that cause foodborne illness grow fastest in this range, doubling in as little as 20 minutes at the warmest end of it. That’s why hot food needs to stay at or above 140°F and cold food at or below 40°F, with no more than two hours in between, or one hour above 90°F.
How long does food last in the fridge without power?
A fridge keeps food safely cold for about four hours after the power goes out, as long as the door stays closed. Past four hours, guidance from USDA and FoodSafety.gov is to discard perishable items like meat, poultry, fish, eggs and leftovers rather than judge them by how they look or smell.
How long does food last in the freezer without power?
A full freezer holds a safe temperature for about 48 hours without power, and a half-full one for about 24 hours, in both cases with the door kept shut. Food that still has ice crystals or reads 40°F or below on a thermometer is safe to refreeze, though texture and flavor may suffer.
Can I refreeze food after a power outage?
Yes, if it still contains ice crystals or measures 40°F or below. Meat, poultry and seafood that thawed completely and sat above that temperature should be thrown out rather than refrozen, since refreezing doesn’t undo bacterial growth that already happened.
This covers the mechanics that apply to every food in the kitchen, not just the ones with their own article. For specific storage windows, see the complete meal prep storage chart, and for what to actually store food in once it’s back in the fridge, browse the containers section.
