How Do You Know When Potatoes Are Ready To Pick

You know potatoes are ready to pick when the plant’s tops begin to yellow and flop over, signaling that the tubers have reached maturity underground.
 
But knowing when potatoes are ready to pick isn’t always as simple as watching the calendar, because different varieties and planting times change the timeline.
 
If you’ve been asking how do you know when potatoes are ready to pick, the short answer is that the foliage tells you most of what you need to know.
 
In this post, we’ll dig into the clear signs that potatoes are ready to pick, the difference between new and storage potatoes, and a few practical tips to make sure you harvest at the perfect moment.
 
Let’s get our hands dirty and figure out the exact signals that potatoes are ready to pick.
 

Signs That Potatoes Are Ready to Pick

The most reliable way to know potatoes are ready to pick is to watch the above-ground growth, because the plant gives you visual clues before you ever lift a fork.
 
Potatoes are ready to pick when the flowering stage finishes and the stems begin to die back naturally.
 
Here are the specific signs that potatoes are ready to pick, broken down by what you’ll see in your garden.
 

1. Yellowing and Wilting Foliage

The first clear sign that potatoes are ready to pick is when the leaves turn yellow and start to wilt.
 
This usually happens about two to three weeks after the plants have finished flowering.
 
When you notice the lower leaves yellowing first and then the whole vine gradually collapsing, that’s your cue that potatoes are ready to pick.
 
Don’t rush to harvest the moment you see a single yellow leaf, because the skins need time to thicken.
 
Wait until about half of the foliage has died back before you even consider digging.
 

2. Flowering Has Finished

Potato plants produce small white or purple flowers, and once those blooms fade, you’re getting close to the harvest window.
 
While flowering is a good indicator, it’s not the final word on when potatoes are ready to pick.
 
Some varieties flower early, and others may not flower at all in cooler climates, so you can’t rely on blooms alone.
 
If your plants did flower, mark the date and count forward about three weeks, that’s when the potatoes are ready to pick for storage.
 

3. Skin Sets Firmly

A major indicator that potatoes are ready to pick is the condition of the skin, which should be firm and not rub off easily.
 
To test this, gently dig around one plant and rub a potato with your thumb.
 
If the skin peels off easily, the potatoes are ready to pick but only for immediate eating, not for storage.
 
If the skin stays put and feels tough, those potatoes are ready to pick for long-term keeping.
 
This simple “thumb test” is a foolproof way to confirm potatoes are ready to pick.
 

4. Days to Maturity Have Passed

Check your seed packet for the expected days to maturity, which ranges from 70 to 120 days depending on the variety.
 
Early varieties like Yukon Gold may be ready to pick in about 75 days, while maincrop types like Russets need closer to 120 days.
 
Keep a garden journal and note your planting date so you can count forward and estimate when potatoes are ready to pick.
 
The calendar is your backup plan, but always trust the plant’s appearance over the date.
 

How to Tell If Potatoes Are Ready to Pick for New vs. Storage

Your intended use for the potatoes changes how you determine when potatoes are ready to pick.
 
Let’s break down the difference between harvesting new potatoes and mature storage potatoes.
 

New Potatoes: Early Harvest

If you love tender, thin-skinned new potatoes, you can pick them earlier than the full maturity date.
 
New potatoes are ready to pick about two to three weeks after the plants bloom, while the foliage is still green and lush.
 
At this stage, potatoes are ready to pick because they’re small, sweet, and have delicate skins that don’t store well.
 
You can “rob” a few new potatoes by gently reaching into the soil at the edge of the plant without pulling up the whole thing.
 
This way, the remaining potatoes keep growing, and you’ll have more potatoes ready to pick later.
 

Storage Potatoes: Full Maturity

For potatoes you want to store through the winter, wait until the vines have completely died back and turned brown.
 
At this point, potatoes are ready to pick because their skins have cured naturally in the soil.
 
Once the foliage is fully dead, leave the potatoes in the ground for another two weeks if the weather is dry.
 
This extra time in the soil helps the skins harden further, making potatoes ready to pick with less chance of bruising during harvest.
 

Common Mistakes When Determining Potatoes Are Ready to Pick

Even experienced gardeners sometimes guess wrong about when potatoes are ready to pick, so let’s avoid these pitfalls.
 

Harvesting Too Early

Pulling potatoes too early gives you small, underwhelming tubers with paper-thin skins that won’t store.
 
If you dig up a potato and the skin scrapes off with your fingernail, the potatoes are ready to pick only for immediate meals.
 
For bigger yields, resist the urge and wait for more foliage dieback before you decide potatoes are ready to pick.
 

Waiting Too Long

On the flip side, leaving potatoes in the ground too long after the vines die can lead to problems.
 
If the soil stays wet, potatoes can rot, and if temperatures spike, they may start to sprout.
 
While potatoes are ready to pick once the vines die, don’t let them sit for more than a few weeks in wet soil.
 
Set a reminder to check your patch every few days once you notice the foliage fading.
 

Ignoring the Weather Forecast

A hard frost can damage potatoes that are still in the ground, so check the forecast as your harvest window approaches.
 
If a freeze is coming and the vines are still green, you may need to cut the tops off and dig immediately.
 
In this case, potatoes are ready to pick not because of maturity, but because of necessity.
 
The tubers will still be edible, just less ideal for storage, so use them first.
 

How to Test a Single Plant Before Digging Everything

If you’re still unsure how do you know when potatoes are ready to pick, do a test dig on just one plant.
 
Choose a plant near the edge of your row and gently loosen the soil with a garden fork, working from the outside in.
 
Pull up the plant and examine the size of the potatoes and the firmness of their skins.
 
If the largest potatoes are at least the size of a chicken egg and the skins don’t rub off, then potatoes are ready to pick from the whole patch.
 
If they’re smaller than you’d like, simply replant that hill and wait another week before testing again.
 
This method takes the guesswork out of the process, so you’ll know with confidence when potatoes are ready to pick.
 

So, How Do You Know When Potatoes Are Ready to Pick?

You know potatoes are ready to pick when the foliage has yellowed and died back, the skins are firm to the touch, and the tubers have reached your desired size.
 
For new potatoes, potatoes are ready to pick just after flowering, while storage potatoes need the full dieback of the vines.
 
Always combine visual signs with the days-to-maturity estimate for your specific variety, and don’t forget the thumb test.
 
Once you’ve confirmed potatoes are ready to pick, harvest on a dry day, and let them cure in a cool, dark place before storing.
 
Now that you know the signs, you can head to your garden with confidence and dig up a perfect harvest.
 
Happy digging, and enjoy the fruits of your labor, because there’s nothing quite like fresh potatoes from your own soil.