The Right Temperature for Your Refrigerator and Freezer

The temperatures that keep food safe

Your refrigerator should stay between 35°F and 38°F (1.7°C to 3.3°C), and your freezer should be at 0°F (-18°C) or below. These are the temperatures at which harmful bacteria slow down enough that food stays safe to eat. The refrigerator temperature matters more than most people realize—even a few degrees warmer and bacteria multiply fast enough to spoil food in days instead of weeks.

The freezer at 0°F or colder stops bacterial growth almost entirely, which is why frozen food lasts so much longer. But the freezer also needs to be cold enough to prevent freezer burn and keep ice crystals from forming on food. If your freezer creeps above 0°F, you will notice food drying out and developing that grainy, discolored surface that makes it less pleasant to eat, even though it is still safe.

Most refrigerators have a single dial or digital display that controls both compartments, though some newer models let you set them separately. If you have one control, the setting usually affects the fridge temperature first, and the freezer gets colder as you turn it up. Check your manual to see whether your model has independent controls.

Key Takeaways

• Keep your refrigerator between 35°F and 38°F to slow bacterial growth and preserve food safely for a week or more.
• Set your freezer to 0°F or colder to stop bacteria and prevent freezer burn on stored food.
• Use a separate thermometer in each compartment to check the actual temperature, because dial settings do not always match what the manual says.
• Adjust your settings gradually and wait 24 hours between changes so the temperature stabilizes before you measure again.
• Keep the refrigerator door closed as much as possible, because every opening lets cold air escape and forces the compressor to work harder.

How to measure the actual temperature

The dial or display on your refrigerator is a guide, not a may provide. The only way to know if your fridge and freezer are truly at the right temperature is to put a thermometer inside each one. Buy an inexpensive refrigerator thermometer (often called a fridge thermometer or appliance thermometer) at any grocery store or hardware store—they cost a few dollars and last for years.

Place the thermometer in the middle of each compartment, away from the walls and away from the door. The walls are colder because they are closer to the cooling coils, and the door is warmer because it opens to room temperature. Leave the thermometer in place for at least 30 minutes before you read it, so it reaches the true temperature of the air inside. Check it again after 24 hours to make sure the temperature is stable.

If your reading is off, adjust the dial or setting one notch at a time and wait another 24 hours before checking again. Small adjustments take time to show up because the compressor has to run longer to reach the new temperature. Changing the setting too often will make it harder to find the right spot.

Why the freezer temperature matters for food quality

A freezer that is too warm (above 0°F) will not ruin food in the way a warm refrigerator does, but it will change the texture and appearance. Ice crystals form on the surface of frozen food, and the food itself dries out. This is freezer burn, and while it does not make food unsafe, it makes it less appetizing and changes how it cooks or tastes.

Freezer burn happens because water in the food evaporates when the freezer temperature fluctuates or stays above 0°F. The ice crystals you see are that water refreezing on the surface. Keeping the freezer at 0°F or colder slows this process dramatically. If you have a freezer that runs at 5°F or 10°F, you will see freezer burn on meat, vegetables, and ice cream within weeks instead of months.

The other reason to keep the freezer cold is that some bacteria can survive and even grow slowly at temperatures between 0°F and 32°F. At 0°F and below, bacterial growth stops almost completely. This is why the 0°F mark is the standard—it is the point where food is truly safe indefinitely, not just for a few months.

Adjusting temperature when your fridge is too warm or too cold

If your thermometer shows the refrigerator is above 38°F, turn the dial or setting toward the colder end. Most dials are numbered 1 to 5 or 1 to 9, with higher numbers meaning colder. If you have a digital display, look for a minus button or arrow that lowers the temperature. Move it one setting and wait 24 hours.

If the refrigerator is below 35°F and food is freezing on the shelves, turn the dial or setting toward the warmer end. This is less common but happens in older refrigerators or when the thermostat is stuck. Again, move it one setting and wait a full day before checking the temperature again.

If your freezer is above 0°F, the same rule applies—turn toward colder one setting at a time. If the freezer is below -10°F, you can turn it up slightly without losing food safety, though most people leave it alone because the extra cold does not hurt anything and ensures the fridge stays cold enough even if the door opens frequently.

Common reasons your temperature might drift

A refrigerator that runs warmer than it should is often caused by a clogged condenser coil. The coil is usually on the back or underneath the fridge, and dust and pet hair block airflow. Unplug the refrigerator, pull it away from the wall, and use a vacuum with a brush attachment to clean the coil. This single step fixes many temperature problems and improves efficiency.

The door seal is another common culprit. If the rubber gasket around the door is cracked or does not close tightly, cold air leaks out every time you open it. The compressor has to run constantly to keep up, and the fridge never reaches the target temperature. Check the seal by closing the door on a dollar bill—if you can pull it out easily, the seal needs replacing.

Frequent door openings also raise the temperature. Every time you open the door, warm air rushes in and cold air escapes. If you open the door many times a day or leave it open for long periods, the fridge will struggle to stay cold. Organize your fridge so you know where things are and can grab what you need quickly.

In rare cases, the thermostat itself fails and the compressor does not run enough. If you have cleaned the coils, checked the door seal, and minimized door openings but the temperature is still wrong, the thermostat may need replacement. This is a job for a repair technician.

Temperature zones inside your refrigerator

Your refrigerator is not the same temperature everywhere. The back wall and the lowest shelves are coldest because they are closest to the cooling coils. The door shelves are warmest because they are farthest from the cold source and exposed to room temperature every time you open the door. The middle shelves are moderate.

This matters for where you store different foods. Keep eggs, milk, and leftovers on the middle or lower shelves where it is coldest. Store condiments, butter, and beverages on the door, where it is warmer but still cold enough. Keep ready-to-eat foods like deli meat and cheese on the coldest shelf to extend their shelf life. Never store eggs on the door, even though many refrigerators have an egg holder there—eggs need consistent cold to stay safe.

The crisper drawers at the bottom are usually set to a slightly higher humidity and may run a degree or two warmer than the main fridge. This is intentional and helps vegetables and fruit stay fresh longer. Do not move items from the crisper to the coldest shelf unless you want them to freeze.

Seasonal changes and temperature swings

In winter, when your kitchen is cooler, your refrigerator may run less often and the temperature might drop below 35°F. In summer, when the kitchen is warm, the fridge has to work harder and the temperature might creep up. Check your thermometer twice a year—once in winter and once in summer—to see if you need to adjust the dial.

If you notice the temperature swings more than a few degrees between seasons, it usually means the thermostat is not holding steady. A small swing of 1 or 2 degrees is normal, but anything larger suggests a problem with the thermostat or compressor. If adjusting the dial does not help, have a technician check it.

Frequently Asked Questions

Can I store food safely if my fridge is at 40°F instead of 38°F?

Food will stay safe at 40°F, but it will not last as long. Bacteria grow faster at 40°F than at 38°F, so leftovers and deli meat may spoil a day or two sooner. If your fridge runs at 40°F, use perishables within three to four days instead of five to seven.

What happens if my freezer is at 5°F instead of 0°F?

Food will still be safe, but freezer burn will develop faster. Meat, vegetables, and ice cream will show ice crystals and dry spots within a few weeks. The food is still edible, but the texture and taste will be noticeably worse. Keep the freezer at 0°F or colder to avoid this.

Should I adjust the temperature if I am storing a lot of food?

No. A full refrigerator actually stays cold better than an empty one because the food holds the cold. If anything, you might turn the dial slightly warmer because the fridge will not have to work as hard. Always use a thermometer to check the actual temperature rather than guessing.

Why does my freezer frost up even though it is at 0°F?

Frost forms when warm, humid air enters the freezer and condenses on the cold surfaces. This happens when the door seal is loose, the door opens frequently, or you store warm food in the freezer. Check the door seal first, and avoid putting warm food directly into the freezer—let it cool to room temperature first.

Is it safe to turn my freezer colder than -10°F?

Yes, it is safe. Colder temperatures do not harm food and actually slow freezer burn even more. The only downside is that your refrigerator will use more energy. Most people set the freezer between 0°F and -5°F as a balance between food safety, quality, and energy use.