When Do You Know To Pick Onions

You know when to pick onions when the tops start to yellow and flop over, signaling that the bulbs have finished bulking up underground.
 
This is the most reliable sign that your onions have reached maturity and are ready to be harvested.
 
But knowing when to pick onions isn’t just about watching the leaves, it also depends on the type of onion you’re growing, your local climate, and the specific cues each variety gives you.
 
In this post, we’ll dig into the clear signals that tell you when to pick onions, how to test if they’re truly ready, and what happens if you leave them in the ground too long.
 
Let’s get your harvest timing just right.
 

When to Pick Onions Based on Clear Visual Cues

The best way to know when to pick onions is to watch for the natural die-back of the green tops.
 
As the onion bulb matures, it stops sending energy to the leaves and starts focusing on storage instead.
 
Here’s what you’ll see when it’s time to pick onions.
 
1. The Tops Yellow and Wilt
 
When you notice the lower half of the onion stalks turning yellow and beginning to droop, that’s your first clue.
 
This usually happens about 90 to 120 days after planting, depending on the variety.
 
Once about half to three-quarters of the tops have fallen over, you can confidently know when to pick onions.
 
Wait until the necks feel soft and the leaves look tired, but don’t wait until every single leaf is completely brown and brittle.
 
2. The Bulb Pokes Above the Soil
 
Another great indicator of when to pick onions is seeing the shoulders of the bulb emerge from the dirt.
 
As the onion swells, it pushes upward, and the top third of the bulb becomes visible.
 
If the shoulders look rounded and feel firm, your onions are telling you they’re ready.
 
If the bulb still looks flat or feels squishy at the neck, give them a few more days.
 
3. The Neck Feels Soft and Pliable
 
Gently squeeze the stem just above the bulb.
 
When you know when to pick onions, that neck will feel soft and bendable, not stiff or hollow.
 
A hard, upright neck means the onion is still actively growing, so hold off on harvesting.
 
A soft neck indicates the plant has stopped taking up water and nutrients, which is exactly when you should act.
 

When to Pick Onions by Type and Season

Different onion types have different timelines, so you need to know when to pick onions based on what you planted.
 
1. Short-Day Onions
 
Short-day onions start forming bulbs when daylight hours reach about 10 to 12 hours.
 
In warmer southern regions, you’ll typically know when to pick onions from late spring to early summer.
 
These onions mature faster and often signal readiness as early as 90 days after transplanting.
 
2. Long-Day Onions
 
Long-day onions need 14 to 16 hours of daylight to trigger bulb formation.
 
In northern climates, you usually know when to pick onions from mid-summer to early fall.
 
These varieties may take up to 120 days, so patience is key.
 
Wait for the tops to fall over, and you’ll be spot on.
 
3. Day-Neutral Onions
 
Day-neutral onions form bulbs regardless of day length, which makes them great for many regions.
 
You’ll know when to pick onions in this category when the tops begin to yellow, often around 100 days.
 
No matter the type, always rely on the physical signs rather than just the calendar.
 

How to Test If It’s Truly Time to Pick Onions

If you’re still unsure, there’s a simple hands-on test that will tell you when to pick onions.
 
Pull one onion gently from the soil and inspect it closely.
 
If the skin feels papery and the bulb is firm, it’s ready.
 
If the skin is still thick and the bulb is soft, it needs more time.
 
Also, check the roots.
 
When you know when to pick onions, the roots will look somewhat shriveled and dry, not white and vigorous.
 
Another trick is to bend the tops over yourself if they haven’t flopped yet.
 
This stops the flow of sap and speeds up the final ripening, but only do this when you’re close.
 
Bending too early can harm bulb development, so wait until most tops look like they’re about ready.
 
Once you’ve confirmed it’s time to pick onions, don’t pull them all at once if the weather is rainy.
 
Instead, wait for a stretch of dry days to avoid rot.
 

What Happens If You Don’t Know When to Pick Onions and Wait Too Long

If you miss the window, you’ll still eventually know when to pick onions, but the quality can suffer.
 
When onion tops completely die and dry out, the bulbs may start to re-sprout if rain returns.
 
This leads to split bulbs and a bitter flavor.
 
Leaving onions in wet soil for too long can also invite rot and fungal diseases.
 
Additionally, over-mature onions lose their protective outer skins, making them less suitable for long-term storage.
 
So it’s much better to act as soon as you see the classic signs.
 
Once you’ve determined when to pick onions, gently lift them with a garden fork rather than yanking.
 
This avoids bruising the bulbs.
 
Then, let them cure in a dry, shaded spot with good airflow for two to three weeks.
 
Curing is what turns freshly pulled onions into long-lasting kitchen staples.
 

So, When Do You Know to Pick Onions?

You know when to pick onions when the majority of the tops have yellowed and flopped over, and the bulbs feel firm and show their shoulders above the soil.
 
You also know when to pick onions by testing the neck, which should be soft, and by considering whether your variety is short-day, long-day, or day-neutral.
 
By combining these visual cues with a simple tug test and keeping an eye on the weather, you’ll harvest onions at peak flavor every time.
 
There’s nothing quite like pulling up a perfectly mature onion, so get out there and trust those signs.
 
Your garden is basically waving a flag telling you when to pick onions, you just have to look.