How long does food last in fridge without power? About four hours, as long as the door stays shut. A full freezer holds a safe temperature for roughly 48 hours, and a half-full one for about 24. Those three numbers, plus a cheap thermometer, are most of what you need to get through a Southwestern Ontario ice storm without losing a freezer full of food.
This guide covers what to do before the storm, during the outage and after the power comes back, including the restart checks we walk customers through every winter when a fridge or freezer does not seem to wake up properly.
Table of Contents
How long does food last in a fridge without power?
The fridge rule is four hours. Once the power goes, a closed refrigerator holds below 4°C for about that long. After four hours, perishable food — meat, poultry, fish, eggs, dairy, cooked leftovers, cut fruit — should be treated as unsafe if it has warmed above 4°C, even if it looks and smells fine.
The freezer rule depends on how full it is. A full freezer stays at a safe temperature for about 48 hours; a half-full freezer for about 24. Frozen food packed tightly insulates itself, which is why a chest freezer in a Byron basement usually rides out a day-long outage untouched.
These are the same figures Health Canada publishes in its food safety guidance, and they assume the door stays closed. Every time you open it, you spend some of that window. A fridge without power is a food safety question first and an appliance question second.
Before the storm: a 20-minute prep
Environment Canada usually gives a day of warning before freezing rain, and that is plenty. Here is what we do at our own houses.
Freeze a few water bottles or fill the empty freezer space with bags of ice now, because a full freezer holds cold twice as long as a half-empty one and the bottles double as ice packs for a cooler later. Put an inexpensive fridge thermometer in both compartments so you are judging by temperature rather than guesswork when the power returns, and turn both compartments a notch colder the evening before the storm is due so they start the outage with a margin.
- Turn the fridge down to 4°C and the freezer to -18°C if they are not already there. Colder going in means a longer window.
- Fill empty freezer space with jugs or bags of water. A fuller freezer holds temperature longer, and the ice becomes cooler packs later.
- Put a fridge thermometer in each compartment. Guessing is how good food gets thrown out and bad food gets kept.
- Group meat and dairy together in the coldest spot, usually the bottom shelf, so they stay cold as a block.
- Know where your breaker panel is and which breaker feeds the garage or basement freezer.
During the outage: keep the doors shut
The single most useful thing you can do is nothing. Do not open the fridge to check on it, and do not open the freezer at all if you can help it. Every time you open a fridge without power you spend some of that four-hour budget.
If the outage passes four hours, move the fridge perishables into a cooler with ice or the frozen jugs from the freezer, and keep the freezer closed. If it passes the freezer window, block ice or dry ice will buy more time; a hardware store often has both during a storm. A cooler with ice buys a fridge without power another day for the things that matter most.
Resist putting food outside. January in Woodstock may be well below freezing, but sun on a dark container, temperature swings and animals make an unheated porch far less reliable than a closed freezer. A cooler packed with snow on a shaded side of the house is better than loose food.
If you run a generator, keep it outdoors and away from windows. A fridge only needs a few hours of power a day to stay in range as long as the door stays shut.
A modest portable generator will run a fridge and a freezer comfortably, but the compressor draws several times its running wattage for a second at start-up, so leave headroom and start the fridge before you plug in anything else. Use a heavy-gauge outdoor extension cord rated for the load, and never backfeed the house through a wall outlet, which is dangerous to line workers and illegal.
After the power returns: keep or toss
Start with the thermometer, not your nose. If the fridge reads 4°C or below, or the outage was under four hours with the door shut, everything is fine. If it reads above 4°C and you cannot say for how long, toss the perishables listed earlier. Condiments, hard cheeses, butter and whole produce are generally fine.
When in doubt, throw it out is the rule for anything perishable that has spent more than four hours above 4 °C: raw and cooked meat, poultry, fish, eggs, dairy, soft cheeses, cooked rice and pasta, opened baby food and anything with a cream or custard base. Hard cheeses, butter, whole fruit and vegetables, most condiments, jams and bottled sauces are generally fine for much longer. Tasting food to check it is never a safe test, because the bacteria that cause illness do not change the smell or flavour.
In the freezer, look for ice crystals. Food that still has ice crystals, or that reads -18°C to about 4°C, can be safely refrozen, though the texture may suffer. Food that has fully thawed and sat above 4°C for more than two hours should go. When in doubt, throw it out. The freezer half of a fridge without power is far more forgiving than the fresh food side.
Restart checks for your fridge and freezer
This is the part we get calls about: power comes back, the lights are on, and the fridge is quiet or the garage freezer is dead. Before you assume the worst, run through these.
- Give it a few minutes. Compressors have a built-in delay after a power cut and will not restart against pressure. Three to five minutes of silence is normal.
- Check the breaker and the GFCI. Garage and basement freezers are often on a GFCI outlet, and the surge when power returns trips them. Press the reset button on the receptacle, then check the panel for a half-tripped breaker.
- Look at the display. Some fridges wake up in demo or showroom mode after a power blip, with the lights on and cooling off. Others show an error code.
- Allow 24 hours to fully recover. A freezer that was warm may take most of a day to reach -18°C again. Judge it the next morning, not an hour later.
- Listen for clicking. A click every few minutes with no hum means the compressor is trying to start and failing. That is usually the start relay, and it is a job for us rather than more resets.
If the freezer is running but never gets cold enough, our post on a freezer not freezing walks through the other causes, from blocked airflow to a failed evaporator fan. A fridge without power for a day should be back at 4 °C within about 24 hours of the restart.
From the van: after every big outage we get a run of calls about garage freezers that died in the storm. A surprising number turn out to be a GFCI receptacle that tripped when the power flickered back on. Press the little reset button on the outlet before you check anything else.
Appliance Experts repairs refrigerators and freezers across London and Southwestern Ontario, 6 AM–9 PM, seven days a week — usually same day. The service call is free with the repair, and every job carries a 90-day parts and labour warranty.
When to call a pro
Call us if the fridge or freezer is still warm 24 hours after power returned, if the compressor clicks and never runs, if there is a burning smell from the back, or if a display shows an error code that does not clear. Surges can take out a control board or start relay. Storm-related refrigerator repair is usually a relay, board or fan, which lands in the $220–$500 range in Southwestern Ontario; sealed-system and compressor work runs higher, and we will tell you honestly if replacement makes more sense.
Because a warm fridge is a clock ticking on your food, we treat it as urgent. Our emergency appliance repair service runs 6 AM to 9 PM seven days a week, usually same day across London, Brantford and Stratford, and the service call is free with the repair. Stand-alone units are covered under freezer repair. A fridge without power for two days and still warm on the third is a repair call, not a wait.
Frequently asked questions
How long does food last in a fridge without power?
About four hours, provided the door stays closed. After that, perishable food such as meat, dairy, eggs and leftovers that has risen above 4°C should be thrown out. A thermometer in the fridge takes the guesswork out of the decision. That four-hour rule is the single most important number for a fridge without power.
How long will a freezer stay frozen without power?
A full freezer holds a safe temperature for about 48 hours, a half-full freezer for about 24 hours, as long as the door stays shut. Filling empty space with jugs of water before a storm extends that window. Food that still has ice crystals when power returns can be refrozen safely.
Is it safe to put food outside in the snow during an outage?
It is not recommended. Outdoor temperatures swing, sun warms dark containers even in January, and animals find food quickly. A closed freezer, or a cooler packed with ice or snow in a shaded spot, holds a steadier temperature than a porch.
Why is my fridge not running after the power came back on?
Compressors have a built-in delay of a few minutes after a power cut, so silence at first is normal. If it stays quiet, check the breaker and any GFCI outlet, then look for demo mode or an error code on the display. A repeated click with no hum points to a failed start relay, which needs a technician.
Should I unplug my fridge during a power outage?
Unplugging is optional, but it does protect the control board from surges when power flickers back on. If you do unplug it, wait five minutes before plugging it back in so the compressor can start against normal pressure. Keep the doors shut either way.
The bottom line
Four hours for the fridge, 24 to 48 for the freezer, doors shut, thermometer in each. Prep the day before by turning the temperatures down and filling empty freezer space, and after the power returns judge food by temperature and ice crystals rather than by smell. Give the fridge a few minutes to restart and a day to recover, check the GFCI and breaker, and listen for clicking. If it is still warm the next morning, call Appliance Experts at (519) 900-3010 and we will get to you the same day where we can.