The recommended temperature for a freezer to keep food safe is at or below 0°F (-18°C) . However, the temperature may need to be adjusted by a few degrees to account for factors like location, humidity, or outside temperatures. The typical factory setting for a freezer is 0°F (-18°C) . It is important to keep the freezer full, but not packed, as chilled air must be able to move evenly around the food to keep it frozen. If the power goes out, it is recommended to keep the freezer door closed as much as possible. When the door stays closed, a freezer can keep food at an OK temperature for around 48 hours. It is also important to regularly check the temperature of the freezer to make sure it stays constant.