How Do You Know When To Pick Your Potatoes

You know when to pick your potatoes by watching for key visual and physical signs that signal they’ve reached full maturity underground.

Getting the timing right is one of the most rewarding parts of growing your own spuds.

Pick them too early and you’ll end up with tiny, underdeveloped tubers that lack that satisfying, starchy bite.

Pick them too late and you risk dealing with rot, pests, or potatoes that have started sprouting in the soil.

It’s all about reading the plant’s signals and understanding what’s happening beneath the surface.

In this post, we’ll break down exactly how do you know when to pick your potatoes, the difference between new potatoes and storage potatoes, and the simple tests you can do to get it right every single time.

Let’s dig in.

How Do You Know When To Pick Your Potatoes: The Main Indicators

So, how do you know when to pick your potatoes?

The best way is to look at the plant above the ground, because the foliage tells a pretty clear story about what’s happening below.

1. The Flowering Stage Tells You the Tubers Are Forming

When your potato plants start to flower, this is your first major clue about when to pick your potatoes for new, tender spuds.

The appearance of those pretty white or purple blooms signals that the plant has shifted its energy from growing leaves to bulking up the tubers underground.

At this point, you can actually reach into the soil and gently feel for small potatoes, but they won’t be ready for a full harvest yet.

If you want those delicious, thin-skinned new potatoes that are perfect for boiling, you can start harvesting them about two weeks after the flowers first appear.

This is technically when to pick your potatoes if you’re after that early, delicate crop that doesn’t store well but tastes incredible fresh.

2. The Foliage Dying Back Is Your Biggest Sign

The most reliable indicator of when to pick your potatoes for a full, storage-ready crop is when the foliage begins to yellow and die back naturally.

You’ll notice the stems starting to flop over, the leaves turning from a vibrant green to a sickly yellow, and eventually the whole top of the plant will wither and brown.

This is the plant’s way of saying, “I’m done, and the potatoes below are fully mature.”

Once about 70 to 80 percent of the foliage has died back, you know it’s time to start thinking about harvesting.

Don’t wait until every single leaf is completely brown though, as leaving them in the ground too long after die-back can invite rot, especially if the soil stays wet.

3. Checking the Skin Firmness Is a Foolproof Test

If you’re still unsure about when to pick your potatoes, you can do a simple test by digging up one or two “test” plants first.

Gently dig around the base of a plant and pull out a few potatoes to check their skins.

If the skin is very thin and rubs off easily when you run your thumb across it, the potatoes are not mature enough for storage.

When the skin is firmly set and doesn’t peel off with light pressure, that’s a clear sign that when to pick your potatoes has finally arrived.

This skin-setting process is crucial, as potatoes with thin, immature skins will bruise easily and won’t last through the winter months.

Different Timelines for Different Types of Potatoes

Knowing when to pick your potatoes also depends heavily on the variety you planted and how long its growing season is.

1. Early and New Potatoes

First earlies and new potatoes are quick growers, usually ready to harvest just 10 to 12 weeks after planting.

You don’t have to wait for the foliage to die back at all for these.

Instead, the trigger for when to pick your potatoes in this category is the flowering stage.

Once the flowers open, you know the tubers are a decent size, so you can harvest them as needed for immediate meals.

These early varieties are prized for their sweetness and moist texture, but they won’t store well, so pick them when you’re ready to eat them.

2. Maincrop Potatoes for Storage

Maincrop potatoes take much longer to mature, usually needing anywhere from 18 to 20 weeks after planting.

For these, you absolutely must wait for the foliage to die back naturally.

This is the definitive answer to how do you know when to pick your potatoes if you’re planning to store them.

Once the tops have completely died, wait another two to three weeks before digging them up.

This extra time in the ground allows the skins to thicken and set properly, which is essential for long-term storage and prevents them from rotting in your pantry.

Best Practices for Harvesting Your Potatoes

Now that you know when to pick your potatoes, you also need to know how to do it without damaging your prize.

1. Choose the Right Day and Tools

Harvest on a dry day when the soil isn’t too wet or too compacted.

Wet soil will cling to the potatoes, making them heavier and harder to see, and it can also increase the risk of disease.

Use a garden fork rather than a spade, as a fork is less likely to slice right through a potato.

Insert the fork well away from the plant’s base and gently lever the soil upward to loosen the roots and reveal the potatoes.

2. Curing Your Potatoes for Longevity

After you’ve dug them all up and confirmed you picked them at the right time based on their firm skins, you need to cure them.

Curing is the process of letting the skins harden further to heal any minor cuts or bruises from the digging process.

Lay the potatoes out in a single layer in a cool, dark, and well-ventilated area, like a garage or shed, for about two weeks.

Do not wash them before curing, as dirt actually helps protect the skins during this period.

After curing, just brush off the loose soil and store them in a cool, dark, and dry place, and they’ll keep for months.

So, When Do You Know When To Pick Your Potatoes?

You know when to pick your potatoes by watching the plant’s lifecycle, specifically the flowering and the natural die-back of the foliage.

If you’re harvesting for tender new potatoes, pick them when the flowers appear.

If you’re harvesting for storage, you know when to pick your potatoes once the leaves have yellowed, flopped over, and died back, and the skins are tough and don’t rub off easily.

Mastering this simple timing will give you the best of both worlds: a delicious early treat and a robust, long-lasting winter supply.