Under California Retail Food Code §114047, frozen TCS food must be maintained at a temperature that keeps it solidly frozen. What is the commonly cited maximum freezer temperature for proper long-term frozen storage of food in a retail food facility?

Explanation

California Retail Food Code HSC §114047 requires frozen foods to be maintained frozen during storage. Although the code expresses the rule in functional terms ('maintain solidly frozen'), the universally cited industry and health-department guideline is to keep freezer ambient temperature at 0°F (-18°C) or colder. At 0°F, microbial growth essentially stops and quality enzymes work very slowly; at warmer freezer temperatures the food may surface-thaw and refreeze, forming ice crystals that damage texture and allow surface microbial growth during temperature swings. Option A (32°F) is the phase boundary at which ice and water coexist — food at 32°F is not 'solidly frozen' and will become mushy. Option B (20°F) is too warm for long-term storage; food held at 20°F will slowly dehydrate (freezer burn) and quality declines rapidly. Option C (10°F) is also too warm for long-term storage and is closer to the temperature inside a household refrigerator's freezer compartment. Frozen storage at 0°F or colder is the standard answer used on California Food Handler exams.