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You know when to pick a potato by watching for a few clear signs, and timing really matters for the best harvest.
Potatoes are ready to pick when the plants above ground start to bloom, yellow, and die back naturally, though you can also harvest early for smaller “new” potatoes before that point.
Knowing when to pick a potato comes down to what you want from your crop, and whether you plan to eat them right away or store them for months.
In this post, we’ll dig into the exact signals that tell you when to pick a potato, how to tell if a potato is ready based on the plant’s growth stages, and what happens if you wait too long or pull them too early.
Let’s get our hands dirty and figure out the perfect moment to pick a potato from your garden.
How to Know When to Pick a Potato by Plant Signs
The easiest way to know when to pick a potato is to look at the plant itself, as the foliage gives you all the clues you need.
Potato plants follow a predictable timeline, and each stage tells you something about the tubers hiding underground.
Here’s exactly how to pick a potato at the right moment based on what the leaves and stems are doing.
1. When Potato Plants Bloom
Once you see flowers appear on your potato plants, that’s your first signal that the tubers are forming, though they won’t have thick skins yet.
At this stage, you can start to pick a potato if you want tender, thin-skinned “new” potatoes for salads or quick boiling.
These early harvests are delicious, but they don’t store well because the skins are so delicate.
If you’re planning to store your crop, don’t rush to pick a potato just because you see blooms; instead, wait a few more weeks.
2. When Potato Foliage Starts to Yellow
As the season progresses, you’ll notice the lower leaves of the potato plant turning yellow and starting to flop over.
This yellowing signals that the plant is shifting its energy from leafy growth down into the tubers, which are now sizing up nicely.
For most varieties, this is a good time to pick a potato for general eating, as the skins are starting to set but are still a bit thin.
You can test one plant by gently digging around the base to check the size of the tubers.
If they look like a good size, feel free to pick a potato from that plant and leave the rest to mature a little longer.
3. When Potato Vines Die Back Completely
The most reliable time to pick a potato is when the entire vine has turned brown, dried out, and fallen over completely.
This die-back means the potatoes have finished growing and their skins have thickened and cured naturally in the soil.
This is the stage where you should pick a potato for long-term storage, because the tough skins will protect the tubers from bruising and rot.
If you’re unsure whether the tubers are ready, scrape a bit of skin with your thumb; if it doesn’t rub off easily, they’re good to go.
How the Weather and Timing Affect When to Pick a Potato
Beyond the plant’s appearance, environmental factors play a big role in deciding when to pick a potato, especially if you live in a region with unpredictable seasons.
Potatoes don’t handle extreme conditions well, so you’ll need to adjust your harvest plans accordingly.
Here’s how to pick a potato at the right time based on the calendar and the forecast.
1. Days to Maturity for Your Variety
Every potato variety has a specific “days to maturity” number printed on the seed tag, and this is a helpful guideline for when to pick a potato.
Early season varieties like Yukon Gold or Red Norland are ready in about 70 to 90 days from planting.
Main season varieties like Russet Burbank or Katahdin need 90 to 120 days or more before you can pick a potato from them.
Mark your calendar at planting time as a rough reminder, but always confirm with the plant’s appearance before harvesting.
2. Before a Hard Frost Arrives
If a heavy frost is forecast, that’s your urgent cue to know when to pick a potato before the cold damages the tubers.
Frost can turn the sugars in potatoes and make them taste odd, and it can also cause the tubers to rot once they’re in storage.
Even if the vines haven’t fully died back, you should pick a potato immediately if freezing temperatures are on the way.
You can still cure them indoors, but you must get them out of the frozen ground quickly.
3. After a Rainy Spell
A great trick for when to pick a potato is to do it on a dry day, a few days after the last rainfall has soaked the soil.
Digging when the soil is too wet leads to mud clinging to the tubers, which makes them harder to clean and more prone to bruising.
On the flip side, if the ground is baked dry and hard, it can crack or cut the potatoes as you dig.
So aim for a moderate moisture level, and you’ll find it much easier to pick a potato without damaging it.
How to Test If a Potato Is Ready to Pick
If you’re still unsure about the perfect moment, you can always do a quick “test dig” to know when to pick a potato from a specific plant.
This hands-on approach is the most accurate way to judge maturity, since your soil and growing conditions are unique.
Here’s how to test without ruining the whole crop.
1. The Skin Scrape Test
Gently dig up one potato from the edge of the plant, being careful not to stab the tubers with your fork or shovel.
Rub your thumb across the surface of the potato.
If the skin peels off easily, the potato needs more time in the ground.
If the skin is firmly attached and doesn’t rub away, that’s your sign to pick a potato for storage.
2. The Size Check
Another clear way to know when to pick a potato is to gauge the size of the tubers you find during your test dig.
For new potatoes, you want them to be about the size of a hen’s egg, and these are fine to harvest early.
For mature storage potatoes, wait until they reach a size you prefer; usually larger than a chicken egg, but this varies by variety and personal taste.
If your test potato is still small and tiny, leave the plant alone and give it a couple more weeks before you pick a potato from it.
3. The Time-of-Day Rule
You can also improve the quality of your harvest by knowing when to pick a potato during the day, not just during the season.
The best time to harvest is in the morning after the dew has dried but before the sun gets intense.
Cool morning soil temperatures help keep the tubers firm and reduce the risk of sunburn on exposed potatoes.
If you dig in the heat of the afternoon, the potatoes can feel warm and soft, making them more likely to bruise.
So, How Do You Know When to Pick a Potato?
You know when to pick a potato by watching the plant’s foliage, timing your harvest to your variety’s maturity, and checking the weather forecast.
Potatoes are ready to pick when the vines bloom for new potatoes, or when the foliage yellows and dies back completely for mature storage spuds.
If you’re ever in doubt, do a test dig and check the skin’s firmness; that’s the surest method of all.
Getting the timing right means you’ll enjoy the perfect texture, flavor, and shelf life from every potato you pull from the ground.