What Temperature Should a Refrigerator Be? Safe Settings
What temperature should a refrigerator be? Keep it at 40°F (4°C) or below, the freezer at 0°F, and check with a thermometer. See how to set and test it.
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What temperature should a refrigerator be? Keep the refrigerator at 40°F (4°C) or below and the freezer at 0°F (-18°C), the levels food-safety agencies recommend. Dial numbers are not degrees, so check with an appliance thermometer, give it a day after any change and keep the door seal and airflow clear.
What temperature should a refrigerator be: the safe range
Bacteria multiply fastest between about 40°F and 140°F, so the fridge must stay at or below 40°F. Many households set it a little lower, around 37°F, to leave a margin when the door is opened. Too cold, below about 32°F, freezes milk, lettuce and eggs.
| Quick facts: what temperature should a refrigerator be | |
|---|---|
| Refrigerator | 40°F (4°C) or below; around 37°F gives a margin |
| Freezer | 0°F (-18°C) |
| Check with | A separate appliance thermometer |
| Wait after changing | About 24 hours before reading again |
How to check the temperature
- Place an appliance thermometer in a glass of water on the middle shelf, because water changes temperature slowly, like food.
- Leave it for at least five hours or overnight without opening the door.
- Read it and adjust the control.
- Check again after a day. Repeat until it holds steady.
A second thermometer in the freezer, between packages, tells you if it holds 0°F.
Setting the control
Most fridges use a dial from 1 to 5 or a digital panel. The numbers do not match degrees, and a higher number usually means colder. Change it by one step at a time and test between changes. In summer, or in a warm kitchen, you may need a colder setting than in winter.
Where it is coldest
| Spot | Typical use |
|---|---|
| Back of the middle and lower shelves | Raw meat, dairy, leftovers |
| Door shelves | Condiments, drinks, items that tolerate warmth |
| Crisper drawers | Fruit and vegetables, with humidity control |
Reasons the temperature drifts
A door that does not seal, blocked vents, a dirty condenser coil, an overstuffed fridge, frequent door openings or a failing fan, thermostat or compressor can all push the reading up. Letting hot food go in, or storing items against the back wall, adds to the problem.
Keeping it right
Do not overfill, leave a gap for air around food, wipe the door seal, vacuum the condenser coils twice a year and avoid placing the fridge next to a stove or in direct sun.
Food that needs the coldest spot
Raw meat, poultry and fish belong on the lowest shelf in a sealed container so drips cannot reach other food. Milk and eggs do better inside the fridge than in the door, where the temperature swings most. Leftovers should go in shallow containers and be chilled within two hours of cooking. Leave a little space between items so cold air can move.
What the setting means in practice
If the thermometer reads 38°F, you are in a good place. If it reads 42°F, lower the setting by one step. If it reads 33°F and the lettuce is freezing, raise it by one step. Nobody needs to chase exact numbers, but staying at or below 40°F is the line that matters for safety. That is the simple answer to the question of what a fridge should read, and the thermometer is how you prove it.
Seasonal changes
In winter a garage fridge can get so cold that it stops cycling and the freezer warms, so check both. In summer a hot kitchen makes the compressor work harder. Check the readings at the change of each season, and again after a long power cut or a move.
When to call a professional
If the thermometer will not drop below 40°F after adjustments and cleaning, the fridge cycles constantly or the freezer is warm while the fridge is cold, a technician should check the fan, sensor and sealed system. Knowing what temperature a refrigerator should be is the first test, and it tells you when it is failing.
Related reading
- Fridge Not Cold Enough? Find the Cause and Keep Food Safe
- What Temperature Should a Freezer Be? 0°F and How to Check
- How to fix refrigerator not cooling: A Step-by-Step Guide
- Refrigerator Freezing Food? Settings, Vents and Sensor Fixes
Browse all appliance repair guides, or find an appliance repair technician in your city from the appliance repair directory.
Frequently asked questions
What temperature should a refrigerator be?
The refrigerator should be at 40°F (4°C) or below, and many people aim for about 37°F to leave a safety margin. Check with a separate thermometer in the middle of the fridge rather than trusting the dial numbers.
What temperature should a freezer be?
A freezer should hold 0°F (-18°C). At that temperature food stays safe indefinitely, though quality drops over time. Place a thermometer between packages and check it after any power cut or door left open.
Is 45 degrees too warm for a refrigerator?
Yes. Above 40°F bacteria grow faster, so 45°F is too warm for perishable food. Lower the setting one step, wait a day, and recheck. If it will not cool, look at door seals, airflow and coils.
How do I measure my fridge temperature?
Put an appliance thermometer in a glass of water on the middle shelf, close the door and leave it for at least five hours or overnight. Read it without opening the door too long, then adjust the control gradually.
What number should I set my fridge dial to?
Dial numbers are relative, not degrees, so there is no universal number. Start in the middle, test with a thermometer, and move one step at a time until the fridge reads 37 to 40°F.
Why is my fridge too cold and freezing food?
The setting may be too cold, vents may be blocked by food, or a faulty thermostat or damper is letting too much cold air in. Raise the setting a step, clear the vents and test again.
What temperature should a refrigerator be in summer?
The target does not change, 40°F or below. In a hot kitchen the fridge works harder, so you may need a colder dial setting, space around the unit and clean condenser coils to keep it there.
Does the door shelf stay as cold as the back?
No. The door is the warmest part because it is exposed whenever you open it. Keep milk, meat and eggs on the shelves and use the door for condiments and drinks that tolerate warmer temperatures.
How long does it take a fridge to cool down after changing the setting?
Give it about 24 hours before judging the new temperature. The air cools quickly but the food and water inside take longer, which is why a thermometer in a glass of water gives a truer reading.
When should I call a pro about my fridge temperature?
Call if it cannot hold 40°F after you have cleaned the coils, checked the seal and adjusted the setting, or if the compressor runs constantly or the freezer is warm. Those point to a failing fan, sensor or sealed system.
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