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You know it’s time to pick your potatoes when the plants start to flower, the foliage begins to yellow and die back, and the skins feel firm and set on the tubers.
That’s the short, sweet answer for when to pick your potatoes, but the full story takes a little more digging.
Potatoes are one of those crops where harvest timing truly makes or breaks your yield.
Pick too early, and you’ll get thin-skinned, watery spuds that don’t store well.
Wait too long, and you risk rot, pests, or overgrown, knobby monsters that are past their prime.
In this post, we’ll walk through the clear signs that tell you when to pick your potatoes, how to check for readiness without guessing, and what to do for new vs. storage potatoes.
Let’s get those taters out of the ground at the perfect moment.
When to Pick Your Potatoes: The Clear Above-Ground Signs
The easiest way to know when to pick your potatoes is to watch what’s happening above the soil.
The plant itself does the talking, and once you learn the language, you’ll never miss the window again.
There are a few distinct stages, and each one tells you something different about when to pick your potatoes.
1. Flowering Is the First Hint
When your potato plants start producing those pretty little white, pink, or purple flowers, that’s your first signal.
Flowering means the plants have reached maturity and are now putting energy into tuber development.
At this point, you can technically harvest baby or new potatoes if you want that thin-skinned, delicate treat.
But for full-sized storage potatoes, flowering is just the beginning of the waiting game.
You shouldn’t pull the whole plant yet, but you can gently feel around the soil to check the size of a few tubers.
2. Yellowing Foliage Is the Big Green Light
The most reliable way to know when to pick your potatoes is when the leaves start turning yellow and flopping over.
This happens naturally when the plant has finished its job and is beginning to die back.
The sugars and starches are being pulled down into the tubers, which is exactly what you want for flavor and storage.
Once about half the foliage has yellowed, you’re within striking distance of harvest time.
Don’t rush it, though, because those leaves are still feeding the potatoes below.
3. Foliage Completely Dead: The Final Countdown
When the stems have fully dried out, turned brown, and fallen flat on the ground, that’s the definitive answer to when to pick your potatoes.
This usually happens two to three weeks after the foliage first starts yellowing.
At this stage, the skins have had time to thicken and set, which is crucial for long-term storage.
If you dig them up too soon, the skins will scrape off easily with your thumb, and those potatoes won’t last more than a few weeks.
Wait until that foliage is crisp and brown, and you’ve nailed the timing.
How to Double-Check Before You Dig
You don’t have to rely only on the plant’s appearance to know when to pick your potatoes.
There are a couple of hands-on tests that take the guesswork out of harvest.
1. The Skin-Set Test
Gently dig around one of the outer plants and pull up a single potato.
Rub your thumb across the skin.
If the skin rubs off easily, the potato is not ready for storage, so give it more time.
If the skin stays firm, doesn’t scrape off, and feels tough and set, then you know it’s time to pick your potatoes.
This simple test tells you more than any calendar date ever will.
2. Check the Calendar for Your Variety
Potatoes come in early, mid-season, and late varieties, and each has its own countdown.
Early potatoes are ready about 70 to 90 days after planting, while maincrop or storage potatoes need 100 to 130 days.
You can look back at your planting date and count forward, but this is just a rough guide.
Weather, soil conditions, and moisture all affect the timeline, so always combine the calendar with the foliage and skin tests.
That way, you’re never left guessing when to pick your potatoes.
New Potatoes vs. Storage Potatoes: Timing Is Different
The answer to when to pick your potatoes changes depending on what you plan to do with them.
Are you craving a fresh, buttery new potato for dinner tonight, or do you want a pantry full of spuds for winter?
The purpose determines the perfect harvest time.
1. For New Potatoes: Pick Early and Often
New potatoes are harvested young, usually two to three weeks after the plants flower.
At this point, the tubers are small, thin-skinned, and full of moisture.
You can gently reach into the soil and pull out a few larger ones without disturbing the whole plant.
This method lets the remaining potatoes keep growing for a later harvest.
New potatoes don’t store well at all, so eat them within a few days of digging.
2. For Storage Potatoes: Wait for Full Maturity
If you want potatoes that will last for months in a cool, dark cellar, you need to wait until the vines are completely dead.
That’s when you truly know when to pick your potatoes for maximum shelf life.
After digging, let them cure on the soil surface for a couple of hours to dry the skins.
Then move them to a dark, well-ventilated area with high humidity for a week or two.
Curing helps heal any nicks in the skin, which prevents rot during storage.
What Happens if You Pick Potatoes Too Early or Too Late?
Nailing the exact moment of when to pick your potatoes is a balancing act.
So, here’s what goes wrong when you miss that window on either side.
1. Too Early: Thin Skins and Poor Storage
Potatoes dug before the foliage dies back have fragile skins that tear and peel.
These potatoes also have higher water content, so they’re more prone to rotting in storage.
They’ll taste fine if eaten fresh, but they simply won’t keep.
You’re also likely leaving yield on the table, since those tubers would have grown bigger.
2. Too Late: Rot, Pests, and Sprouting
Leaving potatoes in the ground too long invites trouble.
Wet soil can cause them to rot, and potato beetles or wireworms might move in.
Once the soil warms up again, the tubers will start to sprout, and their flavor will decline.
You’ll also find more misshapen, cracked spuds if you wait excessively.
So, How Do You Know When to Pick Your Potatoes? The Final Dig
You know when to pick your potatoes by watching the foliage die back, testing the firmness of the skin, and counting the days since planting.
Flowering means new potatoes are on the table, but full yellowing and browning of the vines signals the true harvest time.
Always dig up a test potato and check if the skin is set before you commit to pulling the whole row.
And remember, if you want storage spuds, patience is your best friend, so let those vines fully die.
If you’re after new potatoes, feel free to harvest early and enjoy that fresh, waxy flavor right away.
Either way, your harvest timing is the single biggest factor in potato quality, and now you know exactly how do you know when to pick your potatoes.
Get out there, trust the signs, and enjoy the fruits of your labor.
Happy digging.