Most whole heads of lettuce, like iceberg or romaine, will stay vibrant for about seven to ten days in a proper fridge. Pre-mixed bagged salads, on the other hand, are on a tighter schedule—usually just three to five days once opened. Think of it this way: every time you tear, cut, or wash a leaf, you’re breaking its natural defenses and accelerating the clock.
Temperature is the silent hero here. Lettuce wants to live in a humid drawer set between 32°F and 36°F (0°C to 2°C). Anything warmer whispers “wilt me,” and anything freezing literally damages the cells, turning them into a half-frozen, weeping disaster. Your produce drawer isn’t just for show—it’s a climate-controlled penthouse for delicate greenery.
The Telltale Signs of The End
Sliminess is the red alert. If you open your bag and feel a wet, almost greasy film on the leaves, that’s bacterial breakdown happening right under your nose. Do not try to wash it off; it’s a biological wave you cannot surf back to shore.
Discoloration is your second clue. Minor brown edges or russet spotting (those tiny brown dots that look like freckles) are cosmetic and totally safe to trim or eat. But large, dark, water-soaked patches that feel mushy? That’s the plant version of a bad cold. Trust your nose too: a sour, “off” smell means the sugars are fermenting, and the party is over.
