Produce

Onions (Whole): Storage & Shelf Life

Whole onions last 1-2 months in a cool, dry, dark spot, considerably longer than chopped onion's fridge-bound week or so, since an intact onion's outer papery layers provide real ongoing protection that's lost the moment it's cut.

Freezing chopped onion (10-12 months) is the practical way to extend a whole onion's usable life well past its pantry window, though — as with chopped onion generally — the texture softens considerably, making frozen onion suited to cooked dishes rather than a raw, crisp application.

Storing onions away from potatoes is a genuinely practical piece of kitchen advice, not just folklore — potatoes release moisture and gases that can accelerate onion spoilage when the two are stored in close, prolonged contact, a real interaction worth avoiding with simple physical separation in the pantry.

A mesh bag, similar to how onions are often sold, allows better airflow than a sealed plastic bag, which can trap moisture and speed sprouting.

An onion that's begun to sprout green shoots is still usable — the sprout itself can simply be removed and the onion used as normal, similar to garlic.

Storing onions in a single layer, rather than a deep bin, keeps the ones on the bottom from bruising under the weight above and developing soft spots that spread to their neighbors.

A cool, dark cupboard or pantry away from the stove's heat is a better long-term spot for onions than a countertop basket exposed to light.

Onions and potatoes are commonly stored side by side in home kitchens, but keeping them apart actually extends both — potatoes give off moisture that speeds an onion's sprouting, while onions release gases that can encourage a potato to sprout sooner.

A whole onion left cut in half, even wrapped, spoils faster than one stored whole, since the cut surface exposes moist inner layers to air and to whatever else is nearby in the fridge.

An onion that's gone soft and mushy at the root end, with a sour smell radiating from that spot specifically, has begun to rot from the inside even if the outer, papery layers still look intact.