How Do You Know When To Pick Kohlrabi

You know it’s time to pick kohlrabi when the bulb reaches about 2 to 3 inches in diameter, roughly the size of a tennis ball or a golf ball.
 
That’s the sweet spot for flavor and texture, and picking kohlrabi at this stage ensures you get that crisp, mild, almost broccoli-stem taste without any woody toughness.
 
If you leave it in the ground too long, the bulb gets larger, but it also gets fibrous and overly pungent, which is not what you want in your harvest.
 
In this post, we’ll dive deep into how do you know when to pick kohlrabi, covering size, firmness, leaf health, and timing so you can enjoy the best crop possible.
 
Let’s get right into it.
 

How Do You Know When To Pick Kohlrabi: The Key Signs

The most reliable way to know when to pick kohlrabi is to monitor the bulb’s size and firmness, and there are several clear indicators that tell you it’s ready.
 
When you’re figuring out how do you know when to pick kohlrabi, remember that this vegetable doesn’t wait for you, so timing is everything.
 
Here are the main signs that your kohlrabi is begging to be harvested.
 

1. The Bulb Diameter Hits the Ideal Range

The single biggest clue for how do you know when to pick kohlrabi is measuring that bulb with your fingers or a ruler.
 
For most varieties, kohlrabi is ready to pick when the bulb is between 2 and 3 inches across, though some smaller varieties are best at just 1.5 inches.
 
If you’re wondering how do you know when to pick kohlrabi of the giant type, like ‘Superschmelz,’ you can wait until it’s 4 to 5 inches because those stay tender longer.
 
But for standard green or purple kohlrabi, don’t let it exceed 3 inches, because oversized bulbs turn tough and lose that sweet crunch.
 
Gently squeeze the bulb to gauge its size, and if it feels like a firm tennis ball, that’s your cue to start picking kohlrabi.
 

2. The Bulb Feels Firm and Dense

Beyond size, firmness is a fantastic answer to how do you know when to pick kohlrabi because it tells you about internal quality.
 
A ready kohlrabi bulb should feel rock solid when you press on it, with no give or sponginess whatsoever.
 
If the bulb feels soft, mushy, or has any give, it’s either overripe, starting to rot, or stressed from inconsistent watering, so it’s past its prime.
 
When you’re checking how do you know when to pick kohlrabi, also look at the skin, which should be smooth and shiny, not cracked or splitting.
 
Cracked skin is a sign the plant took up too much water too fast, and while still edible, it won’t store well, so pick kohlrabi right away if you see cracks.
 

3. The Leaves Are Still Green and Healthy

The foliage is another great indicator when you’re trying to learn how do you know when to pick kohlrabi because it reflects the plant’s overall health.
 
As long as the leaves are vibrant green, upright, and not yellowing, your kohlrabi is probably still in its prime harvesting window.
 
If you see the lower leaves starting to yellow or die back, that’s the plant signaling it’s diverting energy to the bulb, which means it’s time to pick.
 
Also, if the leaves look overly large and the bulb feels like it’s stopped growing for a week, that’s another way to know when to pick kohlrabi before it bolts.
 
Once the plant sends up a flower stalk, which is called bolting, the bulb becomes bitter and woody, and you’ve missed the harvesting window.
 

When To Pick Kohlrabi Based On Days To Maturity

If you’re not sure how do you know when to pick kohlrabi just by looking, you can always rely on the calendar.
 
Most kohlrabi varieties mature in about 45 to 60 days from transplanting, so mark that date on your garden journal.
 
If you’re growing from seed directly in the ground, add another two weeks or so to that timeline because the seedlings need extra time to establish.
 
While days to maturity is a helpful guide, it’s not a hard rule, and you should still check the bulb size and firmness as we mentioned above.
 
Weather plays a big role too, meaning if it’s been unusually cool, kohlrabi may take longer, and if it’s hot, it might mature faster.
 
So combining the calendar with physical checks is the smartest way to be absolutely certain when to pick kohlrabi.
 

1. Spring Harvest Timing

For a spring crop, you’ll want to pick kohlrabi before the heat of summer arrives, because hot weather makes it bolt quickly.
 
When daytime temperatures consistently climb above 75°F, your kohlrabi will start to get tough, so plan to harvest it all before then.
 
If you planted early in spring, you can start checking for readiness around 45 days, and you’ll usually get a two to three week harvest window.
 

2. Fall Harvest Timing

For a fall crop, understanding when to pick kohlrabi is a little easier because cooler weather keeps the bulbs crisp and sweet.
 
You can actually leave fall kohlrabi in the ground a bit longer, up to 4 inches in diameter, since colder temps prevent woodiness.
 
Many gardeners even harvest kohlrabi after a light frost, because the cold converts starches to sugars, making them taste even sweeter.
 

What Happens If You Don’t Pick Kohlrabi In Time

So you’ve asked yourself how do you know when to pick kohlrabi, and you think you have it figured out, but what if you delay?
 
If you leave kohlrabi in the ground past its peak, the bulb will continue expanding, but the texture will turn tough and woody.
 
It also develops a stronger, more bitter flavor that’s less pleasant for eating raw, though it’s still okay for cooking in soups.
 
Eventually, the plant will bolt and flower, which completely ruins the bulb’s edibility, and then you’ll have no harvest at all.
 
That’s why it’s better to pick kohlrabi a little early rather than a little late, since immature bulbs are still perfectly tender.
 

So, How Do You Know When To Pick Kohlrabi?

You know when to pick kohlrabi by checking for a bulb that’s 2 to 3 inches across, feels firm to the touch, and sits atop healthy green leaves.
 
Once you spot these signs, don’t hesitate, because kohlrabi waits for no one, and a few extra days can ruin your crop.
 
So keep an eye on your garden, measure those bulbs regularly, and remember that harvesting early is always safer than harvesting late.
 
Hope this guide has cleared up how do you know when to pick kohlrabi, and now you can go out and enjoy your crisp, delicious harvest.