Key takeaways
- Keep the fridge at or below 40°F; 37°F is ideal. Keep the freezer at 0°F.
- On most dials, a higher number means colder, but check your manual.
- Measure with a thermometer in a glass of water, not by feel.
- Food freezing or warm shelves often means a blocked vent or a failing part.
The Safe Numbers: 37°F and 0°F
The FDA and USDA recommend keeping your refrigerator at or below 40°F and your freezer at 0°F. Most experts suggest setting the fridge a little lower, around 37°F, to give yourself a safety margin.
| Section | Best setting | Danger zone |
|---|---|---|
| Refrigerator | 35°F to 38°F (37°F is ideal) | Above 40°F |
| Freezer | 0°F | Above 10°F for long periods |
| Crisper drawers | Same as the fridge, humidity set by produce | Freezing near the vents |
| Door shelves | Usually a few degrees warmer | Not for milk or eggs |
Why 40°F? Bacteria grow fastest between 40°F and 140°F. Keeping food below 40°F slows that growth a lot.
What Do the Numbers on the Dial Mean?
Many fridges, especially older ones, use a dial marked 1 to 5 or 1 to 9 instead of degrees. On most models, a higher number means colder. But not on all, so check your manual.
The middle setting is usually a good place to start. Then measure the real temperature with a thermometer and adjust one step at a time, waiting 24 hours between changes.
How to Check Your Fridge’s Real Temperature
- Buy an inexpensive appliance thermometer.
- Put it in a glass of water on the middle shelf of the fridge. Water shows the food temperature better than air.
- Leave it for at least 5 hours, ideally overnight, without opening the door much.
- For the freezer, place the thermometer between frozen packages.
- Read it quickly when you open the door.
If the fridge reads above 40°F or the freezer reads above 0°F after a day, adjust the setting. If that does not help, something is wrong.
Where to Store Food in Your Fridge
Temperatures are not the same everywhere in your fridge. Use that to your advantage.
- Top shelves: ready-to-eat foods, leftovers and drinks.
- Middle shelves: dairy and eggs. Keep eggs in their carton, not in the door.
- Bottom shelf: raw meat, poultry and fish, in a tray so juices cannot drip.
- Crisper drawers: fruits and vegetables. Use the high-humidity drawer for leafy greens.
- Door: condiments, juice and water. It is the warmest spot.
Keep food from blocking the air vents, usually at the back or top. Blocked vents can make some shelves freeze while others stay warm.
Fridge Too Cold or Too Warm? What It Means
| What you see | Common cause | What to do |
|---|---|---|
| Food freezing in the fridge | Setting too cold, food against the vent, stuck damper | Raise the setting, move food, then call if it continues |
| Fridge above 40°F | Dirty coils, blocked vents, failed fan | Clean coils, clear vents, then call |
| Fridge warm, freezer cold | Evaporator fan or frosted coil | Call for service |
| Temperatures swing day to day | Failing sensor or control | Call for service |
| Freezer above 0°F | Weak door seal, defrost problem | Check the seal, then call |
Temperatures still wrong?
If adjusting the setting and clearing the vents does not fix it, a sensor, damper, fan or defrost part has likely failed. We can test it the same day.
Thermostat and temperature control repair · Refrigerator not cooling · Freezer repair
Tips to Keep Temperatures Steady
- Do not overload the fridge, but do not leave it nearly empty either. Food helps hold the cold.
- Let hot leftovers cool a bit before putting them in, but refrigerate within 2 hours.
- Close the door quickly, especially on hot La Mesa afternoons.
- Check door seals. Our maintenance checklist shows how.