What Is a Good Temperature for a Refrigerator?

The best temperature for a refrigerator is 37°F (3°C), which keeps food fresh without freezing delicate items like lettuce. The U.S. Food and Drug Administration (FDA) recommends keeping your refrigerator at or below 40°F (4°C) to prevent bacterial growth, while the freezer should be at 0°F (-18°C).

Setting your fridge to the right temperature is one of the simplest ways to prevent foodborne illness and reduce waste. But many refrigerators have inaccurate dials or digital displays, so it's important to verify the actual temperature with a thermometer. This guide explains the ideal temperature range, how to check and adjust your fridge, and what to do if it's not cooling properly.

Why Refrigerator Temperature Matters

Bacteria that cause food poisoning grow most rapidly between 40°F and 140°F (4°C and 60°C), a range the FDA calls the "Danger Zone." Keeping your refrigerator at or below 40°F slows bacterial growth significantly, but the FDA notes that it does not stop it entirely. That's why perishable foods should not be left out for more than two hours (or one hour if the room temperature is above 90°F).

Setting your fridge to 37°F provides a safety margin below the 40°F threshold. According to Consumer Reports, 37°F is the temperature that "will preserve fresh food for as long as possible without ice crystals forming on lettuce or bacteria growing in raw meats." At this temperature, most fresh foods stay safe and retain their quality longer.

Ideal Temperature Ranges for Refrigerator and Freezer

Different sources recommend slightly different ranges, but they all fall within a narrow band:

• FDA: Refrigerator at or below 40°F; freezer at 0°F.
• Consumer Reports: Refrigerator at 37°F; freezer at 0°F.
• U.S. Department of Energy (via Bosch): Refrigerator between 35°F and 38°F; freezer at 0°F or lower.
• Home Depot: Refrigerator at 40°F or below; freezer at 0°F.
• Lowe's: Refrigerator at 37°F.

For most households, setting the refrigerator to 37°F and the freezer to 0°F is a good target. However, some foods have specific needs:

• Dairy products like milk and soft cheeses stay fresher at the colder end of the range (around 35°F).
• Delicate produce such as lettuce and berries may do better at slightly higher temperatures (around 38°F) to avoid freezing.
• Ice cream is often best stored at -10°F to -20°F to maintain a creamy texture, though 0°F is safe.

How to Check Your Refrigerator's Temperature

Even if your fridge has a digital display, it may not be accurate. Consumer Reports testing found that some refrigerators are off by as much as 5°F. To get an accurate reading, use a refrigerator thermometer. These are inexpensive and available at most home centers or online.

Follow these steps to check your fridge temperature:

1. Place a refrigerator thermometer in the center of the middle shelf, away from the walls and door.
2. Place a separate thermometer in the freezer.
3. Close the door and wait at least 24 hours for the temperature to stabilize.
4. Check the readings. The fridge should be between 35°F and 38°F, and the freezer at 0°F or below.

If the temperature is outside the recommended range, adjust the fridge's thermostat and wait another 24 hours before rechecking.

Adjusting Your Refrigerator's Temperature

Refrigerator controls vary. Some have a dial numbered 1 to 5 or 1 to 9, while others have digital buttons. The numbers do not correspond to degrees; they are relative settings. In many models, a higher number means colder, but this is not universal. Check your owner's manual if you're unsure.

If your fridge has a digital display, you can set the exact temperature. For dial-controlled models, start with the middle setting and adjust based on thermometer readings. For example, if the fridge is too warm at setting 3, turn it to 4 and wait 24 hours.

Consumer Reports provides ideal settings for many tested models. If your model is not listed, use a thermometer to find the right setting yourself.

What to Do If Your Refrigerator Isn't Cold Enough

If your fridge is not reaching the recommended temperature, there are several possible causes:

• Door seals: Dirty or damaged gaskets can let cold air escape. Clean them with mild detergent and check for cracks. Test the seal by closing the door on a dollar bill; if you can pull it out easily, the seal may need replacing.
• Overloading: A packed fridge blocks air circulation. Leave some space between items for cold air to flow.
• Hot food: Placing hot leftovers directly in the fridge raises the internal temperature. Let food cool slightly before refrigerating, but don't leave it out for more than two hours.
• Thermostat setting: The control may have been accidentally changed. Adjust it and wait 24 hours.
• Mechanical issues: If the fridge is still warm after checking the above, there may be a problem with the compressor, condenser coils, or refrigerant. In that case, consult a professional.

If the temperature in your fridge rises above 40°F for more than two hours, the FDA advises discarding perishable foods like meat, poultry, fish, dairy, and leftovers to avoid foodborne illness.

Common Questions About Refrigerator Temperature

Is 42°F OK for a refrigerator?

No, 42°F is above the FDA's recommended maximum of 40°F. At 42°F, bacteria can grow more rapidly, increasing the risk of foodborne illness. Aim for 37°F to be safe.

Is 37°F cold enough for a refrigerator?

Yes, 37°F is ideal. It's cold enough to slow bacterial growth but not so cold that it freezes most foods. However, some delicate items like lettuce may freeze if the temperature drops slightly, so monitor your fridge's actual temperature.

Should a fridge be on 1 or 5?

It depends on the model. In many refrigerators, 5 is colder than 1, but this is not universal. Check your owner's manual or use a thermometer to determine which setting gives you 37°F.

What are the ideal temperatures for a refrigerator and freezer?

The ideal refrigerator temperature is 37°F, and the ideal freezer temperature is 0°F. The safe range for the fridge is 35°F to 38°F, and the freezer should be at 0°F or below.

For more detailed guidance, see the FDA's refrigerator thermometer tips, Consumer Reports' testing insights, and Bosch's temperature recommendations.