How to Check Your Refrigerator Temperature

The number on a refrigerator dial usually tells you the setting you selected. An appliance thermometer tells you how cold the compartment actually is. That distinction matters when you move into a new place, adjust a dial, or notice that milk seems less cold than usual. The FDA and USDA advise keeping the refrigerator at 40 degrees Fahrenheit or below and the freezer at zero degrees Fahrenheit or below. A simple thermometer gives you a way to check both compartments as part of an ordinary kitchen routine.

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Choose a thermometer you can read easily

Look for an appliance thermometer intended for refrigerators or freezers. A model that stands on a shelf or clips onto a rack can be easier to spot than one hidden behind a carton. Choose markings or a display you can read quickly so you can close the door after looking. A food thermometer serves a different purpose. It measures the temperature of an individual item, while an appliance thermometer helps you monitor the compartment.

If your refrigerator has a temperature display, keep the appliance thermometer as a separate reference. Check the owner's instructions for the controls and the thermometer's own directions for placement. Leave room around the thermometer and keep it visible when you unpack groceries. If you use two thermometers, put one in the refrigerator and one in the freezer so both readings are available whenever you need them.

Check again after making a change

Take a reading after the door has been closed for a while. If the refrigerator is warmer than 40 degrees, consult the owner's instructions and adjust the temperature setting. Give the appliance time to stabilize before checking again. Changing several settings in quick succession can make it hard to tell what helped. Write down the reading and the adjustment if you need to keep track over the course of a day.

If readings stay above the recommended limit, look for simple problems you can see. A tall container may prevent the door from closing fully, or packages may block an air vent. If the refrigerator still cannot hold a safe temperature, follow the manufacturer's service guidance and move perishable food to reliable cold storage. Consider how long those foods may have been warm before deciding whether to keep them.

Organize the shelves so cold air can circulate

A grocery trip can leave the fridge packed from front to back. Try grouping items into zones and leave room around vents. Put ready-to-eat foods where you can find them quickly. Keep raw meat, poultry, and seafood in leakproof packaging or a container below foods you plan to eat without cooking. That way, any drips are less likely to reach a salad or a container of cut fruit.

Make a spot for foods that need attention first. A front shelf can hold the yogurt you plan to use tomorrow or the prepared vegetables for tonight. Refrigerate perishable groceries promptly after shopping and use clean containers for leftovers. A thermometer confirms that the appliance is cold enough, while quick storage and thoughtful placement help keep food cold and separated.

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Keep the reading useful during a power outage

Keep the refrigerator and freezer doors closed as much as possible during a power outage. USDA guidance says a closed refrigerator generally keeps food safe for up to four hours without power. Once power returns, use the temperature readings and the time the food may have been warm to guide decisions. USDA advises discarding perishables such as meat, fish, eggs, and leftovers that have been above 40 degrees for two hours. If you cannot establish how long a perishable item was warm, err on the side of safety.

For a regular check, glance at the thermometer when you put away groceries or make your weekly shopping list. Recheck after an outage or whenever you adjust the controls. Keeping the reading easy to see means you can catch a problem before you have to guess what happened to a full fridge.