Should You Refrigerate Potatoes?
No, potatoes should not be refrigerated. Cold temperatures convert potato starches into sugars, which caramelize excessively during frying or roasting, creating bitter flavors and potentially harmful compounds (acrylamide). Store potatoes in a cool (45-55°F), dark, well-ventilated place like a pantry or basement. Avoid storing near onions, which accelerate spoilage.
Key Takeaways
Explanation
Potatoes undergo 'cold-induced sweetening' when stored below 42°F. The cold triggers enzymes that convert starch into glucose and fructose. While this makes raw potatoes taste sweeter, these sugars cause problems when cooking: they brown too quickly, create bitter burnt flavors, and significantly increase acrylamide formation during high-heat cooking.
Acrylamide is a compound that forms when sugars and amino acids are heated together, particularly in starchy foods cooked at high temperatures. Refrigerated potatoes produce more acrylamide when fried or roasted due to their elevated sugar content. While occasional exposure isn't dangerous, it's best minimized.
Ideal potato storage is dark, cool (but not cold), and dry with good air circulation. A paper bag in a pantry works well. Light exposure causes potatoes to develop green patches (solanine, which is mildly toxic) and sprouting. Stored properly, potatoes last 3-5 weeks. New potatoes are more perishable and should be used within a week.
The green coloring on light-exposed potatoes is chlorophyll, which is harmless by itself, but it indicates the simultaneous production of solanine and chaconine - toxic glycoalkaloids. Concentrations above 20mg per 100g of potato can cause nausea, vomiting, and diarrhea. Peeling removes about 80% of glycoalkaloids since they concentrate in the skin and the outer 1/16 inch of flesh. If green coloring extends deep into the potato or the potato tastes bitter, discard it entirely rather than trying to cut away affected portions.
Potato variety affects storage duration. Russet and Yukon Gold potatoes, with their thick skins and lower moisture content, store for 4-5 weeks in optimal conditions. Red and new potatoes have thinner skins and higher moisture, lasting only 2-3 weeks. Fingerling potatoes fall somewhere in between at 3-4 weeks. Regardless of variety, check stored potatoes weekly and remove any that have begun sprouting or softening, as decay spreads quickly through ethylene gas and moisture released by deteriorating tubers.
Things to Know
- If you accidentally refrigerated potatoes, leave them at room temperature for 1-2 weeks before frying - some sugar converts back to starch.
- Cooked potatoes (mashed, baked, salads) should be refrigerated and eaten within 3-5 days.
- Sweet potatoes have different storage needs and tolerate refrigeration slightly better than regular potatoes.
- Don't store potatoes with onions - both release gases that accelerate each other's spoilage.