The 2-hour rule
Refrigerate perishable food within 2 hours of cooking or serving — within 1 hour if the surrounding temperature is above 90 °F (32 °C). Past that window, bacteria in the danger zone (40–140 °F) may have multiplied enough that no amount of refrigeration afterward makes the food safe. Food left out beyond the limit should be discarded, not refrigerated late.
Shallow containers are the whole trick
A deep pot of hot soup can take many hours to cool through, even inside a refrigerator. Divide hot food into shallow containers (about 2 inches / 5 cm deep), cut large roasts into smaller pieces, and leave lids loose until cold. It is perfectly safe to refrigerate food while still hot — modern refrigerators handle it; waiting for room temperature is the risky habit, not the fridge.
An ice bath for big batches
For stock or chili by the gallon, set the pot in a sink of ice water and stir every few minutes. This drops the temperature faster than any refrigerator can, after which you portion and chill.
Common mistakes
- Leaving food to cool “until it stops steaming” — that can take hours in a covered pot.
- Refrigerating a whole roast bird uncut.
- Stacking still-warm containers tightly so the middle ones stay warm.