Food Partly Thawed? Check This Before Refreezing It
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USDA FSIS says food that still contains ice crystals or is at 40°F (4°C) or below can be safely refrozen, though its quality may change. Evaluate each package separately after a freezer problem.
Use a thermometer to assess food temperatures. Appearance, smell and a taste test cannot establish whether food is safe. Discard ready-to-eat items that have been contaminated with raw meat juices.
If perishable food has warmed above safe refrigeration temperatures, its time and temperature history determine what to do next. Follow the official food-specific guidance. Keep an appliance thermometer in the freezer so you have better information if the power fails.
