One of the best things about Idaho-Eastern Oregon Spanish onions is their long storage life. Under the proper conditions, these onions will retain their freshness and firm texture for up to nine months, reducing waste from spoilage.
- Onions should be kept in a cool, dry, well-ventilated area.
- Store onions at 34° to 45° Fahrenheit (1.1° to 7° Celsius) with 65% to 70% relative humidity.
- Keep onions out of direct sunlight.
Tips for Commercial Operations
- When storing large quantities of onions, use high volume fans to keep onions dry and prevent decay.
- Bagged or boxed onions should be stored at least one foot away from walls and other pallets to provide good air movement.
- Do not use plastic wrap on onions; the lack of air circulation reduces storage life.
Tips for Home Storage
- Do not store whole onions in plastic bags; the lack of air circulation reduces storage life.
- A basket or mesh bag provides good air circulation and works well for onion storage.
- Do not store onions with potatoes or other produce items that release moisture.
- Onions that are already cut will keep for several days if sealed in plastic bags and refrigerated.
- Chopped or diced onions can be frozen for future preparation in cooked dishes.
- Under proper conditions, whole storage onions can last up to four weeks at home.