The optimal temperature for your refrigerator and freezer is crucial for preserving food effectively.

A refrigerator is a key appliance in modern food storage. By maintaining the correct temperature, it helps slow down bacterial growth and keeps food fresh for extended periods. Meanwhile, freezers prevent bacteria from growing and keep food safe for months, sometimes even indefinitely.

As food temperature rises beyond a certain point, bacteria begin multiplying rapidly. While not all bacteria are harmful, some can pose a risk. To ensure food quality and reduce the likelihood of foodborne illnesses, it's important to maintain the proper refrigerator temperature and follow maintenance best practices.

What is the Ideal Refrigerator Temperature?

The U.S. Food and Drug Administration (FDA) advises that your refrigerator should maintain a temperature of 40°F or lower, with your freezer at or below 0°F. However, the best temperature for your refrigerator is actually a bit cooler. Aim for a range between 35° and 38°F (or 1.7 to 3.3°C). This range is just below freezing, but not so cold that your food will freeze. It's also the closest you should get to the 40°F mark, where bacterial growth accelerates.

Temperatures above the 35° to 38°F range may be too warm, especially if your refrigerator’s built-in thermometer isn’t precise. At higher temperatures, your food may spoil faster, and you could risk exposure to harmful bacteria like Salmonella and E. coli.

What is the Ideal Temperature for a Freezer?

Wondering what temperature your freezer should be set to? Ideally, keep it as close to 0°F as possible, unless you're adding large quantities of warmer food. Some freezers offer a flash freeze setting, which lowers the temperature for 24 hours to prevent freezer burn from temperature fluctuations. If you prefer, you can manually adjust the temperature for a short period, but remember to reset it afterward. Setting your freezer too cold can lead to higher utility bills and may cause food to lose moisture and flavor. Excessive ice buildup in the freezer is a clear indication that it's too cold.

Check out our temperature chart for a printable guide to hang on your refrigerator.

How to Accurately Measure Temperature

Unfortunately, not all refrigerator temperature gauges are reliable. You might set your fridge to 37°F, but the actual temperature could be anywhere from 33°F to 41°F. It's common for fridges to be a few degrees off from the setting you choose.

Additionally, some refrigerators don’t display the actual temperature at all. Instead, they allow you to adjust the temperature on a scale of 1 to 5, with 5 being the warmest. Without a thermometer, you can't know exactly what these numbers correspond to in terms of actual temperature.

You can easily purchase an affordable freestanding appliance thermometer online or at a local store. Place the thermometer in your fridge or freezer and let it sit for 20 minutes before checking the reading. Are the temperatures close to the ideal range, or even the recommended ones?

If not, adjust the fridge settings accordingly to bring it within the safe temperature range of 35° to 38°F using the fridge's temperature control panel. Do the same for your freezer, aiming for a temperature as close to 0°F as possible.

How to Maintain the Right Temperature in Your Fridge and Freezer

If your refrigerator is hovering near 40°F or your freezer feels too warm despite adjusting the temperature, there are several things you can do to help keep everything at the correct temperature.

1. Allow food to cool before storing it.

Placing hot leftovers, like soup or roast chicken, into your fridge or freezer can quickly raise the internal temperature, promoting bacterial growth. To avoid this, let the food cool down a little before storing it (but not all the way to room temperature, as that can take too long).

2. Inspect the door seals.

The gaskets around the refrigerator door help to keep the cold air inside and prevent warm air from entering. If there's a leak in one of these seals, cold air may escape, making it harder for the appliance to maintain the proper temperature. This can also cause your energy usage to increase, raising your electricity bill.

3. Limit how often you open the door.

Every time you open the fridge, cold air escapes and warm air enters. Instead of lingering by the fridge while searching for the perfect snack, get what you need quickly and shut the door right away to maintain the temperature.

4. Keep the area around your fridge clean.

In addition to cleaning the inside of your fridge, it's important to also keep the space around the refrigerator clean. This will help the appliance run more efficiently. If necessary, move the fridge away from the wall to clean behind it and remove any dust or debris. Don't forget to clean the coils with a vacuum or coil brush to keep everything working properly.

5. Move your fridge a few inches away from the wall.

Though many people position their refrigerators right against a wall, this setup isn't the most ideal. If you have the space, try to keep your fridge a few inches away from the wall. This allows air to circulate more freely behind the fridge, helping to dissipate the heat it generates and reducing the strain on the appliance.

6. Keep your fridge and freezer well-stocked.

A full fridge is a more efficient fridge, and the same goes for your freezer. When your refrigerator is adequately stocked, it can maintain a cooler temperature and preserve food more effectively. However, be careful not to overcrowd the space, as that can block air circulation, making it harder for the cool air to move and potentially leading to warm spots. Ideally, keep about 20% of the space empty. A little refrigerator organization can also help you make the most of the available space. If frozen food is being overtaken by bags of store-bought ice, it may be worth considering an ice maker to free up some room.

Frequently Asked Questions

• What should I do if the power goes out to prevent food from spoiling in the refrigerator?

  If the power goes out, avoid opening your refrigerator door. Typically, food can stay fresh for up to four hours without power. If you expect the power to be out for longer, transfer your perishable items to an insulated cooler, a bathtub, or a sink filled with ice to keep them cold.

• Should I repair or replace my refrigerator if it's not keeping food cold enough?

  Depending on the issue, you might not need to replace your refrigerator. A broken gasket that leaks cold air is a simple and affordable fix. However, a malfunctioning compressor can be a more costly repair, possibly as expensive as purchasing a new fridge.