The answer to this depends on what type of mini fridge you’re looking at. Some mini-refrigerators don’t have a freezer unit, meaning the entire storage area is kept at a uniform temperature. You can change that temperature to better fit your needs, but you won’t be able to store separate items at different temperatures. However, many compressor based mini-fridges have freezers that you can keep below freezing, while the rest of the storage space is kept cold but not frigid.