Whole, hard onions? Never in the fridge. Pantry. Dark. Dry. Breathe.
Cut, peeled, or diced onions? Always in the fridge. Airtight container. Use within 7 days.
Green onions (scallions)? They are rebels. Keep them in the fridge, roots in a glass of water. They grow like hydroponic aliens.
Sweet onions (Vidalia, Walla Walla)? They’re crybabies. They rot fast. Fridge or eat them quickly. Trust me.
Maximizing Onion Freshness: Refrigerator Storage Tips And Duration