What Exactly Is Freezer Burn?
Despite its harsh name, freezer burn isn’t a burn at all; it’s a form of dehydration. The process is caused by something called sublimation, which is when ice crystals on the surface of food turn directly into water vapour without ever becoming liquid.
As this moisture escapes, it leaves behind dried-out, tough, and often discoloured patches on your food. Oxygen moves in to fill the empty spaces, which can alter the taste and texture. You'll often see it as grayish-brown spots on meat or shrivelled, dull-looking vegetables. While it looks unappetizing, the good news is that freezer-burned food is generally safe to eat, though its quality is significantly compromised.
The Main Culprit: Air Exposure
The single biggest cause of freezer burn is exposure to cold, dry freezer air. When food is loosely wrapped or stored in a container with a lot of empty space, air gets into contact with the food's surface. Think of the air inside your freezer as a cold, dry wind. This air pulls moisture away from the food, accelerating the sublimation process. Those ice crystals you often see on the outside of the packaging or on the food itself are actually the moisture that has escaped and then re-frozen on the coldest available surface. The longer food is exposed to this air, the more moisture it loses and the more severe the freezer burn becomes.
Your Best Defense: Airtight Wrapping
Since air is the enemy, creating an airtight barrier is your most powerful strategy. The goal is to leave as little space as possible for air to exist between the wrapping and the food. Vacuum sealing is considered the gold standard because it removes almost all air. However, you can achieve excellent results with more common kitchen supplies. A popular and effective method is double-wrapping. For meat, try a tight layer of plastic wrap pressed directly against the surface, followed by a second layer of heavy-duty aluminum foil or freezer paper. Freezer paper is specifically designed for this; its plastic- or wax-coated side goes against the food to lock in moisture, while the paper side provides durability and a surface for labelling. When using freezer bags, be sure to press out as much air as you can before sealing.
Other Smart Freezer Habits
Beyond wrapping, a few other habits can help keep your food fresh. First, always let food cool completely before freezing it. Placing warm food in the freezer can raise the ambient temperature, causing other items to partially thaw and refreeze, which encourages freezer burn. Also, try not to open the freezer door too frequently, as this causes temperature fluctuations that speed up moisture loss. Keep your freezer set at or below 0°F (-18°C) for optimal food safety and quality. Finally, practice a “first in, first out” system. Label everything with the contents and the date you froze it, so you can use older items before they have a chance to develop freezer burn.
Can You Salvage Freezer-Burned Food?
If you do find a freezer-burned item, you don't always have to throw it away. Since it's a quality issue rather than a safety one, mildly affected food can often be salvaged. For meats or poultry, you can simply trim away the dry, discoloured spots before or after cooking. The remaining food might still be a bit tougher or less flavourful, so it's best used in dishes with plenty of moisture and seasoning, like stews, soups, or braises. For freezer-burned vegetables, rinsing them under cold water can remove some surface ice crystals, and strong seasonings can help mask any off-flavours. In the case of ice cream, you can often just scrape off the icy top layer to get to the creamier texture below.
