Expiration & Storage Tips
When does onion expire?
Before the package is opened, and if properly stored, onions usually last for about 2-3 months. Once the onion is peeled or chopped, it should be refrigerated and consumed within 10-14 days. If you have a cut onion and it's been out at room temperature for more than two hours, toss it out. If you've cooked onions, they can be fridge-stored for about 7-10 days. Freezing is a trickier storage method for onions, as freezing changes their texture and makes them softer. However, if you don't mind this texture change, chopped onions can be frozen for 10-12 months.
How do you tell if onion is bad?
Your senses are the best instruments in this case. If the onion has a sour or unpleasant smell, it's likely gone bad. Sliminess or mold are other telltale signs of spoilage. Over time, onions can start to soften, and while not necessarily unsuitable for eating, they might not be as good. Finally, onions that have started sprouting green tops should ideally not be consumed as they can taste bitter.
Tips for storing onion to extend shelf life
• Keep whole onions in a dark, cool and dry place to avoid moisture, which can cause them to rot. A pantry or cellar is ideal.
• Don't store onions in plastic bags. The lack of ventilation can affect their shelf life.
• If you've cut an onion but don't need all of it, it's best to store the rest in the refrigerator. Before doing this, wrap it tightly in plastic or put it in a zipper bag.
• Cooked onions should be stored in a sealed container in the refrigerator.
• Dicing onions and freezing them in a flat layer in a plastic freezer bag can come in handy for future cooking. They can be easily broken apart for individual use.
• Avoid storing onions near potatoes. The gases released by each vegetable can cause the other to decay quicker.