How to tell it is ready

Sweet potatoes are usually ready when roots have reached useful size and the foliage begins to yellow late in the season. The roots should feel firm and well formed, with skin color typical of the variety. Very small roots may need more time if frost is not close. Do not wait for a hard frost because cold soil can injure the roots.

How to harvest

Cut back vines if they are in the way, then loosen soil widely with a digging fork before lifting roots by hand. Start well away from the hill because roots spread and are easy to nick. Handle each root carefully and do not toss them into containers. Even small skinning and bruising can shorten storage life.

Timing

Harvest is commonly 90 to 120 days after planting slips, depending on variety and heat. Dig before frost and while soil is still warm and workable. A dry day is best, and morning harvest works well once the soil surface is not wet.

After the harvest

Do not wash roots before curing. Cure them in warm, humid conditions for about 1 to 2 weeks so skins toughen and wounds heal, then move them to a moderately cool, dry place. Keep them out of chilling temperatures.

Tips

Check a few roots first if you are unsure about size because the tops may still look vigorous late in the season. Do not leave dug roots in the sun for long. Rough handling at harvest is one of the main reasons homegrown sweet potatoes do not store well.

General guidance for US home gardens. Timing varies by variety and region; check your local frost dates. Page updated Aug 4, 2026.