OnionsShelf Life, Storage, and Spoilage Guide
Pantry
1-2 months
Store whole, raw onions in a cool (45-55°F or 7-12°C), dry, dark, and well-ventilated place (e.g., pantry, basement) away from potatoes, which release moisture and gases that can cause spoilage.
Refrigerator
Not RecommendedNot recommended for whole, raw
Whole, raw onions are best stored in a cool, dry, dark place, not the refrigerator, as refrigeration can make them soft and reduce their shelf life. However, *cut* raw onions must be refrigerated in a sealed container for 7-10 days.
Freezer
Not RecommendedNot recommended for whole, raw
Whole onions are not recommended for freezing due to significant texture changes. For freezing, chop or slice onions first. Blanched or unblanched chopped onions can be frozen for 10-12 months in airtight freezer bags or containers.
Signs of Spoilage
- Soft spots or mushy texture
- Mold (black, green, or white fuzzy growth)
- Strong, unpleasant odor (beyond typical onion smell)
- Discoloration
- Excessive sprouting (while not necessarily unsafe, it indicates aging and can affect flavor/texture)
Room Temperature Safety
40°F–140°F
While whole, raw onions are shelf-stable at room temperature, *cut* or *cooked* onions are perishable. They should not be left at room temperature for more than 2 hours. If the ambient temperature is above 90°F (32°C), this time is reduced to 1 hour.
Safe Handling
Wash hands thoroughly with soap and water before and after handling onions.
Prevent cross-contamination by using separate cutting boards and utensils for raw onions and other foods, especially ready-to-eat items.
Refrigerate cut, peeled, or cooked onions promptly in a sealed container.
Discard any onions that show signs of spoilage.