When Are Sweet Potatoes Ready To Be Picked

Sweet potatoes are ready to be picked when their leaves start to yellow and the tubers have reached a good size, typically around 90 to 120 days after planting.
 
Knowing exactly when are sweet potatoes ready to be picked can be a bit tricky for new gardeners, but there are several reliable signs you can watch for.
 
The timing largely depends on the variety you planted and your local growing conditions.
 
In this post, we’ll help you figure out when are sweet potatoes ready to be picked, how to tell if yours are mature, and the best techniques for harvesting them.
 
Let’s dig into the details so you can enjoy a bumper crop of these delicious, nutritious roots.
 

When Are Sweet Potatoes Ready to Be Picked: Key Signs to Look For

The most direct answer to when are sweet potatoes ready to be picked revolves around a few clear visual and physical cues.
 
Sweet potatoes don’t announce their readiness with a loud signal, but they do give you subtle hints if you know what to check.
 
First, count the days from when you set out your slips, and you’ll have a solid baseline for when are sweet potatoes ready to be picked for most common varieties.
 
Second, watch the foliage, as it will begin to yellow and die back when the roots are fully mature.
 
Third, gently probe the soil near the base of the plant to feel for the size of the tubers underneath.
 
Here’s a closer look at what determines when are sweet potatoes ready to be picked.
 

1. Days to Maturity: A Simple Calendar Guide

Most sweet potato varieties need between 90 and 120 days of warm weather to produce full-sized roots.
 
If you planted early in the season, you can mark your calendar for that 90-day mark as the earliest point when are sweet potatoes ready to be picked.
 
Fast-maturing types like ‘Beauregard’ might be ready closer to 90 days, while others like ‘Jewel’ or ‘Purple’ may need the full 120 days.
 
Check the seed packet or plant tag for your specific variety’s “days to harvest” number, and use that as your starting point.
 
Remember that cooler summer temperatures can slow growth, so you might need to wait longer than the average time.
 

2. Yellowing Leaves Signal Maturity

Another reliable way to know when are sweet potatoes ready to be picked is to watch the leaves near the end of the season.
 
As the roots reach their full size, the plant naturally shifts energy away from foliage growth and into the tubers.
 
This causes the lower leaves to turn yellow and eventually brown, much like what happens with regular potatoes.
 
When you see significant yellowing and wilting, it’s a strong sign that the sweet potatoes are mature and ready to harvest.
 
However, don’t wait too long after the leaves die completely, because frost can damage the roots even underground.
 

3. Cracking Soil Around the Base

If you notice the soil at the base of the plant starting to crack and lift, that’s another clue for when are sweet potatoes ready to be picked.
 
As the tubers swell underground, they push against the soil and can create visible ridges or cracks on the surface.
 
This is a fantastic natural indicator that the roots are getting large and plump, which means it’s close to harvest time.
 
Just be gentle when you check, as you don’t want to accidentally stab a tuber with your trowel.
 

4. The Size Test: Feel for Big Roots

When you’re wondering when are sweet potatoes ready to be picked, a quick hands-on check can give you the answer.
 
Carefully brush away a bit of soil near the plant’s crown without disturbing the roots too much.
 
Feel for the sweet potatoes and gauge their diameter, aiming for at least 2 to 3 inches across.
 
If they still feel thin like pencil-sized roots, they need more time to bulk up.
 
If they feel nice and thick with some give, they’re likely ready to be pulled from the ground.
 
Always plan to harvest before the first frost, as cold soil can cause the roots to rot and lose their flavor.
 

How to Pick Sweet Potatoes at the Perfect Time

Once you’ve confirmed when are sweet potatoes ready to be picked, the next step is doing it right.
 
Harvesting sweet potatoes properly ensures they store well and taste amazing for months.
 
You’ll want to pick sweet potatoes on a dry day when the soil isn’t overly wet or muddy.
 
Here are a few practical tips for making sure you pick sweet potatoes without damaging them.
 

1. Loosen the Soil First

Before you pull up the plant, use a garden fork to gently loosen the soil around the entire root zone.
 
Start about a foot away from the main stem and work your way inward to avoid slicing into the tubers.
 
This step is crucial because sweet potato skins are very thin and bruise easily when scraped.
 
Once the soil is loose, you can lift the entire plant carefully or dig by hand to reveal the roots.
 
Avoid yanking the vines, as they can break off and leave the tubers buried underground.
 

2. Cure Your Freshly Picked Sweet Potatoes

Right after you pick sweet potatoes, they aren’t at their sweetest just yet.
 
Curing is a critical process that converts starches into sugars and heals any small cuts on the skin.
 
Place your freshly harvested sweet potatoes in a warm, humid spot at about 85°F with high humidity for 7 to 10 days.
 
A small shed, greenhouse, or even a sunny room can work if you keep them moist with a damp cloth.
 
After curing, move them to a cool, dark storage area at around 55–60°F where they can last for several months.
 

3. Avoid Frost at All Costs

Even a light frost can ruin sweet potatoes that are still in the ground, turning them mushy and unappetizing.
 
So when are sweet potatoes ready to be picked in terms of weather? Always harvest before the first expected frost date.
 
If the forecast calls for an early cold snap, it’s better to pick sweet potatoes a bit early than to lose the entire crop.
 
Slightly underripe sweet potatoes will still cure and sweeten, but frost-damaged ones won’t store well.
 
Keep an eye on your local forecast and plan your harvest accordingly.
 

What Happens If You Pick Sweet Potatoes Too Early or Too Late?

Timing matters a lot, so let’s address what happens if you miss the window for when are sweet potatoes ready to be picked.
 
If you pick sweet potatoes too early, they’ll be small, thin-skinned, and lack the deep sweetness you crave.
 
Early harvests can still be eaten quickly, but they won’t store well and may taste more starchy.
 
On the flip side, if you wait too long and frost hits the vines, the roots can become damaged internally.
 
The ideal approach is to aim for that sweet spot in the fall when foliage yellows but before any frost warning.
 

So, When Are Sweet Potatoes Ready to Be Picked?

Sweet potatoes are ready to be picked when they’ve had enough warm days and showing yellowing leaves and sizeable tubers.
 
Generally, you’re looking at 90 to 120 days after planting, and you should harvest before the first autumn frost.
 
The best way to know when are sweet potatoes ready to be picked is to combine calendar timing with the visual and tactile signs we discussed.
 
Check the foliage for yellowing, feel the soil for cracking, and gently test the root size under the surface.
 
Once you’re confident they’re mature, dig them up carefully, cure them properly, and enjoy the fruits of your labor.
 
Now you have a clear answer for when are sweet potatoes ready to be picked, so grab your fork and head out to the garden.
 
Happy harvesting, and we hope your sweet potato crop turns out deliciously sweet and abundant.