What to check first
Decide whether you want new or storage potatoes
New potatoes are young tubers with delicate skins, not a particular variety. A meal-sized early harvest is a different goal from lifting a crop to keep for months. For storage, choose a variety known to keep well and allow it to mature. [1]
Test the skin before lifting everything
Dig one representative tuber and rub the surface gently. Oregon State recommends waiting another week if the skin comes away easily, provided conditions allow. Plant condition, weather and tuber maturity matter more than a universal harvest month. [2]
Look for damage and wetness
Separate tubers cut by a fork from undamaged ones. Examine soft or wet areas rather than assuming every blemish is harmless. Prolonged wet conditions can open lenticels, the small pores on the skin, and make decay more likely. [1] [3]
Choose the next step for your plant
Dig gently and keep the crop shaded
Choose workable soil and dig outside the tuber cluster, lifting rather than stabbing through it. Brush loose soil away carefully. Keep harvested potatoes out of strong light and separate damaged but otherwise sound tubers for prompt use; discard decaying ones. [1] [2]
Cure sound tubers before longer storage
Oregon State describes a seven-to-ten-day curing period in a dark, ventilated space with moderate temperature and high humidity. Surfaces must not stay wet. Curing helps minor harvest wounds heal; it cannot rescue a tuber that is already rotting. [2]
Keep storage dark and check the temperature
After curing, Oregon State recommends around 40–46°F for table potatoes. Use a ventilated container and inspect it regularly. A hot cupboard encourages deterioration, while colder conditions can change flavor and frying quality. Avoid light even when the room feels suitably cool. [2]
What to avoid
- Do not treat thin-skinned new potatoes as a long-storage crop.
- Do not leave harvested potatoes exposed to light or store visibly rotting tubers.
What to watch next
Look for shriveling, sprouting and soft patches during storage. If many tubers deteriorate, reassess temperature, airflow and moisture before storing the next harvest in the same place. Keep a record of variety and harvest condition to distinguish poor storage conditions from a short-keeping crop.
Common questions
Why do stored potatoes turn green?
Light triggers green chlorophyll. Greening can accompany higher levels of naturally occurring toxic compounds, so it is not a ripeness signal. Discard extensively green potatoes and prevent further light exposure. [2] [3]
Should I wash potatoes before storing them?
Gentle dry cleaning is usually convenient. Oregon State allows rinsing sticky clay off when needed, but stresses complete surface drying before storage. Wet surfaces and enclosed damp storage increase the risk of decay. [2] [3]
Sources and review
This guide was prepared with AI assistance and checked against the sources below. It has not been reviewed by a botanist. Conditions and plant responses vary; use the checks above to decide what applies. Read our editorial standards.
- University of Minnesota Extension: Growing potatoes in home gardens
New versus mature tubers, dry-weather digging and separating damaged potatoes.
- Oregon State Extension: Harvesting and storing homegrown potatoes
Skin-set test, careful handling, dark curing, storage conditions, cultivar differences and greening.
- Oregon State Extension: What is wrong with my potato tubers?
Light-related greening and prolonged wetness as a risk for enlarged lenticels and decay.