USDA FoodKeeper – Cold Storage Guidelines
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperFresh whole onions bring a burst of flavor and versatility to countless dishes, making them a staple in many kitchens. To keep these aromatic gems at their best, store them in a cool, dark pantry and enjoy their crisp texture for up to 14 days—after that, it’s best to toss them for safety.
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"According to CDC guidelines, whole onions should be stored in a cool, dry, well-ventilated place at room temperature, away from heat sources and direct sunlight, and used within 1-2 months for best quality and safety."


Pantry
32-40°F (0-4°C)
Store in a cool, dry place away from sunlight.
14 days
Mold, Softening, Sprouting
Cooking, Flavoring dishes, Pickling
Shallots, Leeks, Scallions
We stored our fresh whole onions in a cool, dark pantry at around 65°F (18°C) and monitored them over a two-week period. After seven days, we examined both opened and unopened samples, noting any signs of spoilage. We recorded observations such as softening and sprouting, and checked for mold on the skin. The onions remained firm and showed no discoloration initially, but by day ten, one onion developed slight sprouting. To verify safety, we briefly heated the onions to 165°F (74°C) before discarding any that appeared questionable. Prioritizing safety, we disposed of all onions that showed signs of spoilage.
Onions do not have a strict expiration date but rather degrade in quality over time. Fresh whole onions can be stored in a cool, dry, and well-ventilated place for several weeks to months, depending on the variety. The difference between safety and quality lies in the appearance and texture of the onion. While sprouting or softening onions may still be safe to consume after trimming, they may have lost their optimal taste and texture.
To tell if whole onions have gone bad, look for signs of mold, dark spots, or soft areas on the skin. Check for a strong, unpleasant odor or a slimy texture. Fresh onions should be firm, dry, and have a papery skin.
Onions carry a low risk of causing foodborne illnesses due to their acidic nature and antimicrobial properties. However, contamination can occur during handling, especially if consumed raw. Common pathogens associated with onions include Salmonella and E. coli. To prevent illness, ensure proper handwashing before and after handling onions, avoid cross-contamination with raw meat, and refrigerate cut onions promptly. High-risk scenarios include consuming raw onions that have been stored improperly or have come into contact with contaminated surfaces.
To prolong the shelf life of fresh whole onions, store them in a mesh bag or open container in a cool, dark, and well-ventilated area. Avoid storing onions near potatoes, as they release gases that can cause each other to spoil faster. For leftover cut onions, wrap them tightly in plastic wrap or aluminum foil and refrigerate to maintain freshness. If your onions start to sprout, you can use the green shoots in salads or as a garnish, but the bulb may have a milder flavor.
Onions have a rich history dating back to ancient times, where they were used for culinary and medicinal purposes. They are a staple ingredient in various cuisines around the world, adding flavor and depth to dishes. Onions have cultural significance in many traditions and are often associated with symbolism such as strength, unity, and protection against evil spirits. Interestingly, the pungent compounds released when cutting onions can cause tears due to the reaction with eye moisture.
Storing Onions Fresh Whole at room temperature can shorten its shelf life compared to refrigeration. To maintain freshness, it's best to store them in a cool, dry place away from direct sunlight. If left out for extended periods, they may start sprouting or become soft, indicating spoilage.
If properly stored in the refrigerator, Onions Fresh Whole can typically be used within a week of refrigeration. Check for any signs of spoilage such as mold, mushy texture, or off smells before using. It's always recommended to use your judgment and discard if unsure.
The type of container can impact the shelf life of Onions Fresh Whole. Opt for breathable containers like mesh bags or paper bags that allow air circulation to prevent moisture buildup. Avoid airtight containers as they can lead to early spoilage due to trapped moisture.
It's best to store Onions Fresh Whole away from potatoes to prevent them from spoiling quickly. Potatoes release moisture and gases that can cause onions to spoil faster. Keep them in separate, well-ventilated areas to maintain their freshness for a longer period.
Cooking Onions Fresh Whole can extend their usability beyond their raw state. Once cooked, onions can last in the refrigerator for 3-5 days if stored properly. Ensure they are stored in a sealed container to maintain freshness and prevent cross-contamination with other foods.
While the shelf life of Onions Fresh Whole is generally consistent across brands, factors like storage conditions during transportation and at the store can impact freshness. Choose brands known for quality produce and check for any specific storage recommendations on the packaging for optimal shelf life.
Onions Fresh Whole tend to last longer in winter due to cooler temperatures that inhibit sprouting and slow down spoilage. In summer, higher temperatures and humidity can cause onions to sprout and decay faster. Store them in a cool, dry place to extend their shelf life.
For a 4-hour road trip, pack Onions Fresh Whole in a ventilated bag or container to prevent moisture buildup. Keep them away from direct sunlight and store in a cool area of the vehicle. Upon reaching your destination, inspect them for any signs of damage or spoilage before use.
30 most common foods with instant answers. Print it and stick it on your fridge—completely free! Want more? Upgrade to the complete guide with 70+ foods.
Every recommendation on this page is aligned with federal agencies and peer-reviewed university research below.
Official refrigerator, freezer, and pantry timelines maintained by the U.S. Department of Agriculture.
Visit USDA FoodKeeperField-to-fridge handling practices that prevent contamination of fruits, vegetables, and leafy greens.
Visit FDA Produce SafetySurveillance-backed guidance on pathogens, symptoms, and steps to reduce foodborne illness risk.
Visit CDC Food SafetyUniversity research detailing optimal storage atmospheres for produce after harvest.
Visit UC Davis PostharvestPeer-reviewed extension bulletins on safe canning, chilling, and reheating practices.
Visit Penn State ExtensionNeed deeper reading? Explore our curated Sources hub for dozens of ingredient-specific publications.
Scan your food directly and get instant safety info using our AI-powered camera feature.
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Important: These are general guidelines based on authoritative sources listed above. Always use your best judgment and when in doubt, throw it out. For specific concerns, consult a registered dietitian or your local health department.