Freezer burn happens when frozen food loses moisture and gets exposed to cold air, leaving dry, discolored spots. Preventing it comes down to sealing out air and keeping your freezer cold and steady, so your food stays tasty longer.
What you'll need
- Airtight freezer bags or containers
- Freezer-safe wrap
- Marker and labels
- Freezer thermometer (optional)
Step by step
- Cool food before freezingLet hot food cool to room temperature or in the fridge before freezing. Warm food raises the freezer temperature and creates ice crystals.
- Use airtight packagingPack food in heavy freezer bags or airtight containers made for freezing. Thin wrap and regular sandwich bags let too much air through.
- Remove as much air as possiblePress air out of bags before sealing, or use a vacuum sealer if you have one. Less air means less moisture loss and fewer ice crystals.
- Wrap in layers for long storageFor meats and items stored a long time, wrap tightly in freezer wrap, then place in a bag. A double barrier keeps air away better.
- Keep the freezer cold and fullKeep the freezer at or below 0 degrees Fahrenheit and avoid leaving the door open. A fairly full freezer holds its temperature more steadily.
- Label and rotateLabel packages with the date and use older items first. Eating food within a few months limits the chance of freezer burn.
What causes freezer burn?
Freezer burn is dehydration on the surface of frozen food. When air can reach the food, moisture slowly moves out of it and refreezes elsewhere, leaving dry, grayish-brown patches and a leathery or icy texture.
Two things drive this: air trapped against the food inside the package, and temperature swings that cause moisture to evaporate and recrystallize. Loose packaging, thin wrap, and a freezer door that opens often all make it happen faster.
It is not a sign the food has gone bad. It is simply a change in quality caused by lost moisture, which is why the fix centers on blocking air and keeping the temperature steady.
How to wrap food airtight for the freezer
Choose packaging made for freezing. Heavy-duty freezer bags, rigid freezer containers, and freezer-grade wrap are thicker than everyday versions and resist moisture loss better than sandwich bags or standard plastic wrap.
Fit the packaging closely to the food so there are no large air pockets. With containers, pick a size that the food nearly fills; with bags, flatten the contents so the bag can lie snug against them.
For meat, fish, and anything stored longer than a few weeks, consider double-wrapping: wrap the item tightly in freezer wrap or foil first, then seal it inside a freezer bag. The extra layer gives air one more barrier to get through.
How to remove air from freezer bags
Press out as much air as you can before sealing. Lay the bag flat, smooth your hand over it toward the opening, and close it while keeping the food pressed against the bag.
The water-displacement trick works well for bags with a zip seal. Seal the bag almost all the way, then lower it into a bowl or sink of water so the pressure pushes the air out; finish sealing just before the opening goes under, and lift it out.
A vacuum sealer removes the most air and is worth it if you freeze food often, though it is not required. For liquids and soft foods, freeze them solid on a tray first so they hold their shape, then seal them.
Keeping your freezer cold and steady
Aim to keep the freezer at or below 0 degrees Fahrenheit, which is about -18 degrees Celsius. A freezer thermometer is an easy way to confirm the real temperature, since the dial setting is not always accurate.
Steady cold matters as much as the number. A reasonably full freezer holds its temperature better because the frozen items help each other stay cold, so gaps recover more slowly after the door opens.
Try not to overfill to the point that air cannot circulate, and avoid opening the door more than needed or leaving it open while you decide. Placing warm food inside also raises the temperature briefly, which is why cooling food first helps.
Portioning and labeling to prevent freezer burn
Freeze food in meal-sized portions so you only thaw what you plan to use. This avoids opening and refreezing a large package repeatedly, which exposes it to air each time.
Label every package with its contents and the date it went in. A simple date lets you use older items first, and eating food within a few months generally keeps quality high and limits the chance of freezer burn.
Fill containers close to the top to cut down on trapped air, but leave a little headspace for foods with liquid, since they expand as they freeze.
Handy tips
- Portion food into meal-sized amounts so you only thaw what you need and avoid refreezing.
- Fill containers close to the top, leaving a little room for expansion, to reduce trapped air.
- A freezer thermometer helps you confirm the temperature stays cold enough.
Heads up
- Freezer-burned food is generally safe to eat, but avoid eating anything that shows signs of spoilage such as an off smell or slimy texture after thawing.
FAQ
Is freezer-burned food safe to eat?
Yes, freezer burn is a quality issue rather than a safety one, so the food is generally safe. The affected spots may taste dry or bland, and you can trim them off before cooking.
What causes freezer burn?
It is caused by air reaching the food's surface and drawing out moisture, which forms ice crystals and dry patches. Poor sealing and temperature swings make it worse.
How long can food stay in the freezer?
It varies by food, but many items keep good quality for a few months and some for longer. Proper packaging and steady cold temperatures extend how long food stays good.
What is the best way to wrap food to prevent freezer burn?
Use freezer-grade bags, containers, or wrap that fit closely with little air inside. For meat or long storage, wrap the item tightly and then seal it in a freezer bag so air has two barriers to cross.
How do I get the air out of a freezer bag without a vacuum sealer?
Press the air out by hand before sealing, or use the water-displacement method: seal the bag most of the way, lower it into water so the pressure forces air out, then finish sealing before the opening goes under.
What temperature should my freezer be to avoid freezer burn?
Keeping the freezer at or below 0 degrees Fahrenheit, about -18 degrees Celsius, helps a lot. A freezer thermometer confirms the actual temperature, and keeping it steady matters as much as the setting.
Does a full freezer help prevent freezer burn?
A reasonably full freezer holds its temperature more steadily because the frozen items help keep each other cold. Just avoid packing it so tightly that air cannot circulate, and try not to open the door more than needed.
Can you fix or reverse freezer burn?
You cannot restore the lost moisture, but you can trim off the dry, discolored spots before cooking. Using the food in soups, stews, or braises where extra moisture is added often masks the texture change.