Uncooked onions can generally stay fresh in the refrigerator for about 2 to 3 months, but this can vary depending on the type of onion and its freshness when you first store it. Here are some general guidelines for storing uncooked onions in the refrigerator:
Whole Onions: If the onion is unpeeled and whole, it can last for about 2 to 3 months in the refrigerator. Keep it in a cool, dry place within the fridge, away from other strong-smelling foods to prevent the onion from absorbing odors.
Peeled or Sliced Onions: Peeled or sliced onions have a shorter shelf life. They can stay fresh for about 7 to 10 days in the refrigerator if stored in an airtight container or wrapped tightly in plastic wrap.
Chopped Onions: Chopped onions have the shortest shelf life in the fridge. They can last for 1 to 2 days, but it's best to use them as soon as possible since they tend to spoil quickly once cut.
Remember that these are approximate guidelines, and the freshness of the onion at the time of purchase and the storage conditions can affect its longevity. Always inspect the onion for signs of spoilage such as mold, sliminess, or an off odor before using it in your recipes. If you notice any of these signs, it's better to discard the onion to avoid any potential health risks.