Keeping a slice for the next day is perfectly possible, but a cardboard box left in the kitchen is not a storage method. Cold slows the growth of microorganisms, so leftovers must be chilled quickly and eaten within a short time.
Do not leave pizza at room temperature for more than two hours
French guidance recommends placing cooked dishes in the refrigerator no later than two hours after preparation or serving. Beyond that, microorganisms can multiply even if the pizza still looks normal.
In very hot weather, even greater caution is needed. Pizza left in a car, in direct sun on a terrace or near an oven heats up quickly.
Remove the cardboard box and protect the slices
Place the slices in an airtight container or wrap them properly. Cardboard takes up space, absorbs moisture and does not effectively protect against odours or contamination in the refrigerator.
If slices are stacked, separate them with baking paper so the topping is not pulled off. Use a shallow container so the temperature drops quickly.
Store at 4 °C or below
ANSES recommends a temperature between 0 and 4 °C in the coldest area of the refrigerator. Avoid placing the container in the door, where temperature fluctuates more.
How long can pizza be kept?
As a precaution, we recommend eating it within 48 hours. French guidance generally mentions two to three days for leftovers from cooked dishes, with greater caution for vulnerable people.
The clock does not reset after reheating. The more time food spends outside the cold chain and the more temperature cycles it undergoes, the less controlled its storage becomes.
Can slices be frozen?
At home, rapid freezing is possible while the pizza is still fresh and has not spent too long at room temperature. Wrap slices separately and mark the date. The texture of mozzarella, vegetables and dough may change after thawing.
Thaw in the refrigerator or reheat directly depending on the chosen method; do not leave pizza to thaw for several hours on the worktop.
Reheat thoroughly
For food eaten hot, ANSES recommends an internal temperature above 70 °C. Reheat the slice until the centre is fully hot, not just the surface. A covered frying pan or preheated oven usually gives a more pleasant result than a microwave alone.
Can smell or appearance be trusted?
An abnormal smell, mould or slimy texture obviously means the pizza must be discarded. But the reverse is not true: food can be risky without visible signs. If in doubt about time outside refrigeration or the date, do not eat it.
Frequently asked questions
Can pizza be kept in its cardboard box?
For a few minutes, yes. In the refrigerator, a closed food-safe container protects the slices much better.
Does vegetarian pizza keep longer?
Not necessarily. It still contains baked dough, cheese and prepared vegetables. The same cautious rules apply.
Can pizza be eaten cold the next day?
Yes, if it was chilled quickly and correctly. For vulnerable people, thorough reheating is preferable depending on the topping.
References and sources
These sources provide further verification of the main technical, cultural and food-safety references cited in the article.