Curing and Storing Sweet Potatoes

When do I dig sweet potatoes?

Dig before frost damages the vines, or soon after a light frost, as your local guidance describes. Frost-killed vines can lead to rot in the roots. Dig on a dry day, with a fork, well away from the plants.

The skin is delicate at first and scratches easily, so handle roots as you would eggs. Do not wash them.

Let roots dry briefly in the shade and then move them to curing. Many gardeners harvest in a rush before the first frost, so plan ahead for helpers, crates and a place to cure before the day arrives. Keep the vines and leaves away from the roots after digging, and cut the vines before you start so you can see what you are doing.

• Dig before hard frost
• Dig on a dry day
• Do not wash

What is curing and why do it?

Curing holds sweet potatoes in warm, humid conditions for a period, which heals cuts, thickens the skin and converts some starch to sugar. Uncured roots rot sooner and taste bland.

Home curing is the hardest part, because it needs warmth and humidity that most houses do not offer in autumn. Tested guidance from extension offices describes home setups, and I will not give numbers here.

Ask your extension office for curing conditions suited to your climate and varieties. Because curing needs warmth, some growers cure in a garage or a shed with careful, safe heat, and others use a spare room. If conditions for curing are not available, ask your extension office whether a shorter or modified approach is suitable.

How can I cure at home?

Options include a warm room with a humidifier, a covered area with a small heater with careful safety measures, or a closet or box with controlled conditions. Never leave heaters unattended, and follow fire safety rules.

Arrange roots in a single layer or in crates with air spaces, and check often.

If you cannot cure properly, eat the roots soon instead of storing them. Heat sources carry fire risk, so use equipment made for the purpose, keep it clear of combustibles and ask your local fire department for advice on safe setups.

How should I store cured sweet potatoes?

After curing, store in a cool, dry, dark, ventilated place, not in a cold refrigerator, which damages the flavor and can cause hard centers. Ask your extension office for a target range, since conditions differ by variety.

Use crates, baskets or cardboard boxes with newspaper, and keep roots from touching.

Avoid damp places, which lead to rot. A cardboard box lined with newspaper and kept in a closet in the warm part of the house can work for a small crop. Wrap larger roots separately if you wish, and place smaller ones in a box lined with paper.

How long will they keep?

Well cured and stored sweet potatoes can keep for months, and flavor often improves after curing as starch turns to sugar. Quality varies with variety and conditions.

Use roots with damage or bruises first, and check the crop often.

Note which varieties stored best in your garden. Flavor tends to improve for a few weeks after curing, so do not rush to eat the first roots you dig. Cooking sweet potatoes thoroughly and storing leftovers in the refrigerator is a good habit with any root.

What problems should I watch for?

Soft spots, wet areas, shriveling, black or sunken patches and bad smells mean decay. Remove affected roots right away, since rot spreads. Do not eat roots with mold or off odors.

Cut away small bruises and use the root soon, and discard any with extensive rot.

Check weekly for the first month and every couple of weeks after that. If you see a few roots with small soft spots, cut them away well beyond the damaged area, cook the rest promptly and discard anything that smells sour. If you see unusual spots that you cannot identify, ask your extension office, which can often identify rot diseases from a photograph.

What mistakes should I avoid?

Washing before storage, skipping curing, rough handling, chilling in a refrigerator and storing in a damp place are the usual problems. Another is leaving roots in the ground after frost.

Treat the roots gently from the moment of digging.

If you are unsure, ask your county extension office for advice for your region. Record your harvest date, curing dates and conditions in a notebook, so that next year you can repeat what worked and change what did not.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.