The right time to harvest depends on what you want. Dig potatoes while the plant is still green for tender new potatoes. For potatoes you want to keep, wait until the foliage has yellowed and mostly died back, then confirm that the skins are firmly attached and do not rub away easily.
New potatoes or storage potatoes?
Potatoes do not have one universal harvest date. Variety, planting date, weather, growing conditions, and intended use all affect readiness. The most important distinction is whether you want young, thin-skinned potatoes for immediate eating or mature tubers that can be cured and stored.
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| What you want | When to harvest | What to look for | How long they keep |
|---|---|---|---|
| New potatoes | While the plant is still green, after flowering has begun or the blossoms have matured and started to drop | Small, tender tubers—often around 1–2 inches across or roughly the size of a hen’s egg | Short-term only; use promptly |
| Mature potatoes | After the foliage has yellowed and the vines have mostly or completely died back | Skin stays attached when rubbed with a thumb | Several months under suitable storage conditions, especially for late varieties |
Simple rule: harvest earlier for new potatoes; wait for vine dieback and firm skins for potatoes intended for storage.
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The four signs that potatoes are ready
1. The foliage has yellowed and died back
For maincrop or storage potatoes, the clearest above-ground sign is senescence. The leaves turn yellow, the stems topple, and the vines gradually dry down. At this stage, the plant has largely finished directing energy into tuber growth, and the skins have begun to toughen.
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Some gardeners cut or remove the top growth and leave the tubers in the ground for approximately seven to ten days before digging. This extra period can help the skins set, particularly when the foliage has been damaged by disease or weather rather than naturally dying down.
Do not treat a calendar date as proof of readiness. Early varieties may be ready in early or midsummer, while maincrop varieties commonly remain in the soil until late summer or early fall. The timing also changes with when you planted and the conditions during the growing season.
2. The skin does not rub off easily
The most useful final check is a test dig. Carefully uncover one potato and rub its skin with your thumb. If the skin slips, flakes, or rubs away readily, the tuber is still immature and will be easily damaged during lifting and storage.
If you are growing potatoes for storage, wait about another week and test again. A mature potato has skin set: the skin remains firmly attached when rubbed. This test is more dependable than size alone, because varieties produce mature potatoes of different sizes and individual tubers in the same hill may not be identical.
For new potatoes, loose skin is not a problem—it is part of what makes them young and tender. It is a warning only when your goal is a crop that will keep.
3. The tubers are the size you want
Size helps you decide when to harvest new potatoes, but it is not a universal maturity test. Gently dig beside a plant without lifting it and inspect a few tubers. New potatoes are often harvested at approximately hen’s-egg size; depending on the variety and your preference, usable tubers may be around 1–2 inches across.
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Storage potatoes do not need to reach one particular diameter. If the vines have died back and the skins are set, small and large tubers can both be mature. Variety is a major factor: a potato that is fully mature for one cultivar may be considered small for another.
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4. Flowers can indicate new-potato timing
Flowering can provide a useful early-season clue. Some early potatoes are ready when flowers are open, while others are harvested when the flower buds mature and begin to fall. This is especially useful when you want to take a first harvest while leaving the plant to produce more tubers.
Flowering does not prove that every potato plant is ready for a full harvest, and it is not a reliable signal that storage potatoes have reached maturity. For a crop intended to keep, give greater weight to vine dieback and the thumb-rub skin test.
How to harvest new potatoes
New potatoes may be ready roughly seven to eight weeks after planting, but that is only a guide. Variety and growing conditions can move the harvest window earlier or later.
- Choose a plant that has begun flowering or whose blossoms have matured and started to drop.
- Use your hands or a small tool to gently uncover the soil beside the stem.
- Remove a few tubers of the size you want while leaving the plant and its remaining tubers in place.
- Replace the soil around the plant so the remaining tubers are covered.
This method gives you a small early harvest without sacrificing the plant’s later production. If you want a fuller early harvest, loosen the soil around the plant and lift it carefully. New potatoes have delicate skins, so avoid rubbing, dropping, or scraping them. They are best cooked soon after digging rather than treated as a long-term storage crop.
How to harvest mature potatoes for storage
Wait until the foliage has yellowed and the vines have mostly or completely died back. If you remove the top growth first, allow approximately seven to ten days before digging, then perform a test harvest.
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- Uncover one or two potatoes from the edge of the hill.
- Rub the skin with your thumb.
- If the skin stays firmly attached, the crop is ready to lift.
- If the skin comes away easily, leave the potatoes in the ground and test again in about a week, provided the soil and weather remain suitable.
Harvest on a reasonably dry day when the soil is not wet and sticky. Wet conditions make the crop harder to handle and can increase the risk of damage and rot during storage.
How to dig potatoes without piercing them
Damaged tubers should be used first rather than put into long-term storage. The safest approach is to lift the soil from beside the hill instead of driving a tool directly under the stem.
A garden spading fork is a practical choice for lifting potato hills. Start several inches away from the plant, push the fork vertically into the soil, and lift the loosened soil. Work inward gradually, then search through the soil by hand for potatoes the fork has not exposed. A garden fork, digging fork, or shovel can also work, but keep the blade or tines away from the tubers whenever possible.
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- Insert the fork vertically rather than angling it toward the plant.
- Lift and loosen one section of soil at a time.
- Pick through the loosened soil by hand.
- Separate any cut or pierced potatoes for immediate use.
Do not pull hard on the stems. A stem can break while potatoes remain hidden in the surrounding soil.
Harvesting potatoes in containers and bags
Container-grown potatoes can often be harvested by tipping the container onto a tarp and picking through the growing medium by hand. This is gentler than plunging a fork into a confined container and makes it easier to find small tubers.
If you use a potato grow bag, follow the same maturity tests as you would in a garden bed. Flowers may suggest an early harvest, while yellowing foliage and firmly attached skins indicate mature potatoes. Empty the bag carefully, rather than treating its sides as protection against tool damage.
What to do immediately after digging
For new potatoes
Brush off loose soil gently, keep them out of direct light, and use them promptly. Their thin skins and high moisture content make them poorly suited to months of storage.
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For potatoes intended for storage
- Handle gently. Avoid dropping or scraping the tubers.
- Remove loose soil. Do not wash unless necessary. If you do wash them, dry them completely before storing.
- Cure them in the dark. Spread them in a dark, well-ventilated place for approximately seven to ten days, or follow the longer curing period recommended for your variety or local conditions. This allows minor wounds to heal and the skin to set.
- Sort carefully. Set aside potatoes that are cut, bruised, soft, diseased, or shriveled. Use sound-but-damaged tubers first, and discard anything spoiled.
- Store only sound potatoes. Keep them in a cool, dark, humid, well-ventilated location.
After curing, place the potatoes in a breathable container such as paper or hessian sacks, or slatted trays. Potato storage sacks can be useful only when they allow airflow and are kept in a dark location; a sealed plastic bag is not an appropriate long-term container.
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Light can turn potato skins green and may indicate elevated glycoalkaloids, including solanine. Keep potatoes covered or in a dark store from curing through use.
If a potato has only a small green area, remove the green portion generously before cooking. Discard potatoes with extensive greening, a bitter taste, or signs of spoilage rather than trying to save them.
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Common harvest mistakes
- Digging the whole crop when flowers appear: Flowering may signal new-potato timing, but storage potatoes usually need to remain in the ground longer.
- Following the calendar alone: A stated number of days cannot account for variety, planting date, weather, or your desired potato size.
- Choosing size over skin set: Large tubers can still be immature, and small tubers can be mature. Rub the skin when storage readiness matters.
- Stabbing into the center of the hill: Start away from the plant and lift soil progressively to reduce pierced potatoes.
- Washing and storing immediately: Dry and cure potatoes before storage.
- Storing damaged or green tubers: They are more likely to spoil or may be unsuitable to eat.
- Leaving mature potatoes exposed to light: Even after harvest, light can cause greening.
Quick decision checklist
Harvest now as new potatoes if:
- The plant is still green.
- Flowering has begun or blossoms have matured and started to drop.
- The tubers are at the size you want.
- You plan to eat them soon.
Wait for a storage harvest if:
- The foliage has not yet yellowed and died back.
- The potato skin rubs off easily.
- You want thin-skinned, tender potatoes for immediate cooking rather than a durable crop.
Harvest mature potatoes for storage if:
- The foliage has yellowed and the vines have mostly or completely died back.
- A test potato has firm skin that stays attached when rubbed.
- The soil is reasonably dry.
- You have somewhere dark, cool, humid, and well ventilated to cure and store them.
Frequently Asked Questions
Can I harvest potatoes before the plant dies back?
Yes. Harvesting before dieback is appropriate when you want new potatoes. Dig a few carefully while the plant is still green, usually after flowering has begun or the blossoms have matured and started to drop. Do not rely on this signal for potatoes intended for storage.
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Dig a test potato and rub its skin with your thumb. If the skin stays attached, it is set. If it slips or rubs away easily, wait about another week and test again before harvesting a storage crop.
Should I cut the potato vines before harvesting?
It is not always necessary. If the foliage has naturally died back, you can harvest after checking skin set. Some gardeners remove the top growth and wait approximately seven to ten days to help the skins toughen before digging.
Can potatoes stay in the ground after the vines die?
They can remain in the soil briefly if conditions are suitable, but harvest before prolonged wet weather, hard freezes, or pest damage. Confirm readiness with the skin-rub test and choose a reasonably dry day.
How long do new potatoes last after harvest?
New potatoes have thin, delicate skins and do not store well. Keep them dark, handle them gently, and use them promptly rather than curing them for long-term storage.
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Use the harvest signal that matches your goal: flowers and desired size can guide an early new-potato harvest; yellowing, dead vines and firmly attached skins signal mature potatoes for storage. Dig carefully from beside the hill, cure sound tubers in the dark, and store only dry, undamaged potatoes.
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