The USDA’s rule is straightforward: get leftovers into the refrigerator within two hours of cooking. If the room temperature is above 90°F (think outdoor picnics or a hot kitchen), that window shrinks to one hour. Bacteria grow fastest between 40°F and 140°F, which the USDA calls the “Danger Zone,” and food left out longer than two hours is in the growth range for pathogens like Staphylococcus aureus and Salmonella.
Divide large pots of food into shallow containers, no more than two inches deep. A deep pot of stew takes hours to cool in the center, and those hours inside the Danger Zone are where the risk lives. Shallow containers cool fast because more surface area is exposed. Label each container with the date so you don’t have to guess later.
Reheat leftovers to an internal temperature of 165°F (use a food thermometer). If you won’t eat it within four days, freeze it — frozen leftovers are safe indefinitely, though texture and flavor degrade after 3–4 months. Trust your nose as a backup, not a primary tool: some spoiled food doesn’t smell bad.
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