---
title: "Four Hours, Forty-Eight Hours: What Actually Survives an Outage"
description: "How long will food last in fridge after power outage? Four hours for a closed refrigerator, a day for a half-full freezer, two for a full one — and why…"
url: "https://jennairmiami.support/blog/how-long-food-lasts-when-the-power-goes-out/"
date_modified: "2026-08-25"
Category: "Safety & Risks"
---


# Four Hours, Forty-Eight Hours: What Actually Survives an Outage

## How long will food last in fridge after power outage? The Numbers

These are the food-safety figures, not ours. They assume one thing, and the whole page comes back to it.

They are worth having on a JennAir kitchen in particular, where the cold is often spread across a refrigerator column, a separate freezer column and an undercounter drawer or two — three clocks running at once, and the smallest of them runs out first.

|  |
| --- |
| **Refrigerator, unopened** | about **4 hours** |
| **Freezer, half full, unopened** | about **24 hours** |
| **Freezer, full, unopened** | about **48 hours** |

The gap between a half-full and a full freezer is not a rounding error. Frozen food is its own cold store: each package holds cold and gives it back slowly, and a packed freezer is therefore an enormous thermal reserve. An empty one is a box of air.

In hurricane season that is an argument for keeping the freezer fuller than you strictly need to, even if some of what is in there is bottles of water.

## The Instruction Nobody Follows

**Keep the door shut.**

That is the entire advice, and it is worth more than everything else on this page combined. The numbers above are what a closed appliance does. They are not what an appliance does that gets opened four times because somebody wanted to check.

A refrigerator without power cannot make cold. All it can do is hold what it already has. Open it and the cold air — which is heavy, and which pours out at the bottom — is replaced by whatever the kitchen is at, in seconds.

If you need to know how cold it is inside, put a thermometer in there **now**, while the power is on and you are reading this. Then during an outage you can answer the question in one glance instead of standing with the door open deciding.

## When the Power Comes Back

Judge by **temperature and time**, not by how things look or smell.

**The refrigerator.** Anything that has been above 40°F for more than two hours goes. That means meat, poultry, fish, eggs, dairy, cooked leftovers, cut fruit and anything with mayonnaise in it. Condiments, hard cheeses, butter, whole uncut produce and things that live at room temperature anyway are generally fine.

**The freezer.** Look for **ice crystals**. Food that still has them — even if it has gone soft — can be refrozen. It may not be as good afterwards, but it is not dangerous. Food that has fully thawed and been warm for more than two hours goes.

**Do not taste anything to check.** The organisms that cause illness do not reliably change flavor, smell or appearance. This is the one place on this site where we would rather sound like a public health leaflet than be reasonable about it.

## What the Appliance Does Afterwards

Once power is back, expect the machine to behave in ways that look alarming and are not.

**It runs constantly for hours.** Correct. It has a warm cabinet to bring down and it is doing it. A refrigerator that has been off overnight can run more or less continuously for most of a day.

**It shows a notice.** On this platform, **PO** and **PF** are power-outage messages: two letters and no number, and they mean the appliance recorded that the temperature rose while it had no power. They are notices, not failure codes. Acknowledge them with the pad the display points at and they clear.

**The ice maker throws away its first batch.** Many will, deliberately. Let it.

**Clocks are flashing everywhere.** Set them. This matters more than it sounds — several cooking appliances will not run a timed function until they know what time it is, which produces an oven that appears broken and is waiting for the clock.

**Something is still confused.** One full minute off at the breaker. Sixty seconds, not a flick. It is the documented first step for a large share of conditions on this maker's own platform, and it clears a control that has latched after a surge.

## The Part That Is Actually a Repair

Most post-outage calls are not repairs. Some are, and the pattern is recognizable:

- the cabinet is **still not cold after a full day** of running;- the **freezer recovered and the fresh food side did not**, which is an airflow problem rather than an outage one;- the machine **trips the breaker** when it starts;- there is a **new noise** that arrived with the power;- it will not start at all, and a full minute at the breaker changed nothing.

Surges do damage control boards, and a compressor asked to restart against pressure it has not had time to shed can trip a breaker. If any of the above describes your machine, that is worth a call rather than a wait.

## Before the Next One

This is South Florida. There will be a next one.

Which makes this a June job rather than a September one: a freezer packed before the season starts holds twice as long as a half-empty one, and it is the cheapest thing on this page.

- **Keep the freezer fuller.** Bottles of water are free and they work.- **Buy a thermometer for each cabinet.** Two dollars, answers the only question that matters, and lets you leave the door shut.- **Know where your breaker panel is** and which breaker is which. The minute-at-the-breaker step is much easier when you are not hunting.- **If the house is empty for months**, a remote thermometer that alerts you is worth more than anything else here. An outage in an unoccupied house is discovered on arrival, and by then it does not matter what the numbers were.

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