The temperature of your refrigerator is a crucial factor in preserving your food. An incorrect setting not only affects quality but also raises the risk of bacterial growth. Here is why it matters so much and how to get it right.
What is the right temperature?
A refrigerator should be kept between 0 and 5°C, ideally around 4°C. That is the balance that slows bacteria without freezing your food. The freezer compartment, meanwhile, should stay at -18°C. European studies show that many home fridges actually run too warm, which shortens the real shelf life of fresh products (source: ANSES).
Be careful: the control dial often shows a number from 1 to 5, not a temperature. Place a thermometer inside to check. For a step-by-step method, see how to adjust your fridge temperature.
Preventing bacterial growth
Bacteria grow fastest in a range of roughly 5°C to 60°C, known as the "danger zone" (source: USDA, Danger Zone). By keeping your refrigerator at 5°C or below, you sharply slow their multiplication and extend how long food lasts. This is also why you should not leave perishable dishes to cool for a long time at room temperature, a mistake covered in common refrigerator mistakes.
Maintaining food quality
The right temperature helps preserve flavour, texture and nutrients. Too warm, and food degrades quickly; too cold, and some items freeze and spoil, especially leafy vegetables and soft cheeses. Since the different zones of the appliance are not all the same temperature, placement matters too: see the ideal temperature for each refrigerator zone.
Energy savings
A refrigerator set to the right temperature runs more efficiently. If it is needlessly cold, the compressor works harder and uses more electricity for no benefit: lowering the thermostat a few degrees below what is required does not improve preservation but does raise the bill. For more ways to save, see how to reduce your refrigerator's energy use.
Conclusion
Keeping the right temperature, between 0 and 5°C, is essential for food safety, food quality and energy efficiency. Check it regularly with a thermometer rather than trusting the dial alone, and adjust it according to how full the fridge is and the season.