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 not to set the temperature colder than necessary, as it can cause vegetables to lose their freshness. To ensure that the temperature is optimally set, place an appliance thermometer in the freezer and check it regularly to make sure it stays constant. It is also recommended to keep the freezer around 75-80% full to help retain cold air, but not packed, as food may block the internal air vents, making it harder to distribute cold air throughout the freezer.