Household Atlas
Household Atlas
Refrigerators & freezers

What Temperature Should a Refrigerator Be? Fridge and Freezer Settings

The dial inside your fridge is not a thermometer, and the door shelves are not as cold as the back wall. Here is how to set and check the temperature properly.

By Household Atlas Editors Updated 2-minute read 4 sources

Quick answer

The FDA says to keep your refrigerator at or below 40°F (4°C) and your freezer at 0°F (-18°C). Many people aim for about 37°F (3°C) in the fridge to stay safely below the limit without freezing produce. Check with an appliance thermometer, because numbered dials do not show actual temperature.

Difficulty
Easy DIY
Refrigerator
40°F (4°C) or below; about 37°F ideal
Freezer
0°F (-18°C)
Check with
Appliance thermometer, wait 5 to 8 hours
Warmest spot
Door shelves
On this page

Two numbers matter: 40°F (4°C) for the refrigerator and 0°F (-18°C) for the freezer. The FDA explains that harmful bacteria grow slowly below 40°F and multiply rapidly between 40 and 140°F. Keeping the fridge a few degrees under the limit, around 37°F (3°C), gives you a margin for door openings and warm groceries.

Compartment Target Acceptable range
Refrigerator 37°F (3°C) 34 to 40°F (1 to 4°C)
Freezer 0°F (-18°C) 0°F or colder
Crisper drawers Same as the fridge; humidity slider adjusts moisture
Beverage or garage fridge 40°F or below if it holds perishable food

How to check the real temperature

The FDA’s method uses an inexpensive appliance thermometer:

  1. Fridge:

    Put the thermometer in a glass of water in the middle of the refrigerator and wait 5 to 8 hours. If it does not read 38 to 40°F, adjust the control and check again after another 5 to 8 hours.

  2. Freezer:

    Place the thermometer between frozen packages and wait 5 to 8 hours. The target is 0 to 2°F.

  3. Adjust one step at a time.

    Refrigerators respond slowly. Change the setting by one step, then wait several hours before judging.

Temperature zones inside a refrigerator The freezer sits at 0°F. Cold air enters the fridge at the back of the top shelf. The back of the lower shelves is the coldest part of the fresh food section, the middle is moderate, and the door shelves are the warmest. Freezer: 0°F (-18°C) Cold air enters here Items can freeze at the back Middle shelves Leftovers, dairy, eggs Lower back: coldest Raw meat, on the bottom shelf Door: warmest Condiments, drinks, not milk or eggs Crisper drawers Fruit and vegetables
Plate 1Temperatures vary by several degrees inside the same fridge. Store the most perishable foods where it is coldest, and keep raw meat low so it cannot drip onto other food.

What the dial numbers mean

A dial marked 1 to 5 or 1 to 9 does not show degrees. On most models it sets how much cooling the fridge delivers, so higher numbers are colder, and the middle setting is the usual starting point. Some brands reverse this. Digital displays show a target temperature, but the actual temperature in different parts of the fridge can still differ, so a thermometer check is still worthwhile.

Signs the temperature is off

  • Too warm: milk spoils before its date, leftovers turn quickly, the thermometer reads above 40°F.
  • Too cold: lettuce and herbs freeze, drinks get slushy, ice forms on the back wall.
  • Uneven: cold at the back and warm at the front can mean blocked vents or an overpacked fridge. Leave space for air to circulate.

Keep it holding temperature

  • Check the door seals. Close the door on a dollar bill; if it slides out easily, the gasket may be leaking.
  • Clean the condenser coils once or twice a year.
  • Avoid leaving the door open while you decide what to eat.
  • Keep the freezer reasonably full; frozen food helps hold the cold during door openings and power outages.

A fridge that cannot reach 40°F even at its coldest setting, or that clicks every few minutes while warming, needs service. See what refrigerator clicking means.

Bottom lineSet the fridge to about 37°F and the freezer to 0°F, confirm with a thermometer in a glass of water, and store the most perishable food at the back of the lower shelves.

Frequently asked questions

Is 1 or 5 colder on a refrigerator dial?

On most numbered dials, higher numbers mean colder, because the number reflects how hard the fridge works. Some models are the opposite, so check the manual or verify with a thermometer.

Is 42°F too warm for a refrigerator?

Yes. Bacteria grow faster above 40°F, so lower the setting a step and recheck after several hours.

Why is the food in my fridge freezing?

The setting may be too cold, or food may be sitting in front of the vent where cold air enters from the freezer, usually at the back of the top shelf. Raise the setting slightly and keep produce away from the vent.

Can I put hot leftovers straight into the fridge?

Yes. Food safety agencies advise refrigerating leftovers within two hours of cooking. Divide large amounts into shallow containers so they cool quickly.

Sources

  1. Are You Storing Food Safely? U.S. Food and Drug Administration
  2. Refrigerator Thermometers: Cold Facts about Food Safety U.S. Food and Drug Administration
  3. Appliance Thermometers USDA Food Safety and Inspection Service
  4. Leftovers and Food Safety USDA Food Safety and Inspection Service

First published October 6, 2026. Last reviewed October 6, 2026. Spot an error? Tell us and we will check it against the source.

Read next Why Is My Dishwasher Not Drying Dishes? 8 Fixes Many new dishwashers are designed to dry with less heat than older ones, so some water left behind is normal. Here is how to tell normal from broken, and the fixes that make the biggest difference.