The recommended temperature for a freezer to keep food safe is at or below 0°F (-18°C) . The United States Department of Agriculture (USDA) recommends this temperature for all food storage, as it creates a deep freeze that inactivates any type of bacteria, yeast, and mold that may be present in the food. This ultra-low temperature ensures that any bacteria present in the food will not grow and multiply, keeping the food safe to eat for longer periods of time. However, freezer temperatures may need to be adjusted by a few degrees to account for factors like location, humidity, or outside temperatures. It is important to check the temperature periodically and use an appliance thermometer to ensure that the freezer is maintaining the recommended temperature.