The Cold Chain Defined
The cold chain is the unbroken series of refrigerated production, storage, and distribution activities that maintain a desired temperature range from harvest or production through final consumption. For fresh produce, the chain starts at field cooling (within hours of harvest), moves through cold storage warehouses (32-40°F), refrigerated transport (reefer trucks at 32-38°F), retail display cases (32-41°F), and consumer refrigerators (35-38°F). A single break—a truck with a malfunctioning compressor, a loading dock without temperature control, a consumer's 2-hour grocery trip in summer heat—can irreversibly compromise food quality and safety. The FAO estimates that 14% of global food production is lost between harvest and retail, primarily due to cold chain failures.