Expiration & Storage Tips
When does yellow onion expire?
Unopened yellow onions will usually keep well for 3 to 4 weeks in a cool, dark pantry. However, when stored in the refrigerator, they can last up to 2 months. Once the onion has been cut open, it should be used within 1 to 2 days if left at room temperature, or within a week if refrigerated. You can freeze cut or chopped onions, and they can last up to 6 months if stored properly.
How do you tell if yellow onion is bad?
A yellow onion has gone bad if you notice any mold or dark spots on the skin. The surface of the onion will feel soft or slimy, and it will have a strong, unpleasant smell. Once peeled, the insides may also show discoloration or mold. Furthermore, if the onion has begun to sprout, it’s a signal that it’s starting to spoil.
Tips for storing yellow onion to extend shelf life
• Store unopened onions in a cool, dark, well-ventilated place. Avoid keeping onions in a plastic bag as they need airflow to remain fresh.
• Once cut, store the rest of your onion in the refrigerator wrapped in cling film or in a sealed container to prevent it from drying out and to keep the strong odor from spreading in your fridge.
• To freeze onions, you should chop them first, then spread them out on a baking tray. Once frozen, transfer the onions into a sealed bag or airtight container. This so-called 'flash freezing' method will keep the pieces from sticking together.
• If you notice the onion starting to sprout, use it immediately or chop and freeze it to prevent further spoiling.