White OnionShelf Life, Storage, and Spoilage Guide
Pantry
1 to 3 months
Store whole, unpeeled onions in a cool (45-55°F or 7-12°C), dry, dark, and well-ventilated place. Do not store in plastic bags as lack of air circulation reduces shelf life.
Refrigerator
7 to 10 days (cut); 3 to 4 days (cooked)
Whole, unpeeled onions are generally not recommended for refrigerator storage as it can make them soft and reduce their shelf life. Once cut, store tightly wrapped in plastic wrap or in an airtight container in the refrigerator. Cooked onions should be stored in an airtight container.
Freezer
3 to 6 months
Onions can be frozen, preferably chopped. Blanching is not necessary. Place chopped onions in a single layer on a baking sheet to freeze, then transfer to freezer bags or airtight containers.
Signs of Spoilage
- Soft spots or mushy texture
- Mold growth (fuzzy patches, often black or green)
- Strong, unpleasant odor (beyond typical onion pungency)
- Discoloration (dark spots or yellowing)
- Sprouting (while edible, it indicates the onion is past its prime and may have a milder flavor)
Room Temperature Safety
The 'Danger Zone' for bacterial growth is between 40°F (4°C) and 140°F (60°C).
Always refrigerate cut or cooked onions within 2 hours to prevent the growth of harmful bacteria. Whole, unpeeled onions are safe at room temperature if stored properly in a cool, dry, dark, and well-ventilated place.
Safe Handling
Wash hands thoroughly with soap and water before and after handling fresh produce.
Wash whole onions under cool running tap water just before peeling or cutting.
Use separate cutting boards and utensils for raw produce and raw meat, poultry, or seafood to prevent cross-contamination.
Refrigerate cut, peeled, or cooked onions promptly.