To keep food safe when your refrigerator loses power, keep the doors closed as much as possible to maintain a cold temperature. Refrigerated food typically stays safe for up to 4 hours; a full freezer for 48 hours. Use a thermometer to check temperatures—food above 40°F should be discarded. Discard perishable items if power is out for over 4 hours. Prepare coolers with ice for extended outages.
