Carrots and onions should not be stored together.
While both are root vegetables that you might think belong side by side in the pantry, storing carrots and onions together is actually a recipe for spoilage.
If you’ve been wondering, “can carrots and onions be stored together,” the short answer is no, and there are some very good reasons why.
In this post, we’ll explore why you shouldn’t store carrots and onions together, what happens when you do, and the best way to store each so they stay fresh longer.
Let’s get into it.
Why Carrots and Onions Should Not Be Stored Together
Can carrots and onions be stored together safely?
No, they can’t, and here’s why:
1. Onions Release Ethylene Gas
Onions produce ethylene gas as they sit in storage.
This gas is a natural plant hormone that speeds up ripening and aging in nearby produce.
When you store carrots and onions together, the ethylene from the onions makes the carrots go soft, limp, and bitter much faster than they normally would.
That’s why keeping carrots and onions in the same bin or bag is a bad idea.
2. Onions Absorb Moisture and Odors
Onions are like little sponges when it comes to moisture and smells.
Carrots release moisture as they sit, and that moisture can make onions spoil faster by encouraging mold and rot.
On top of that, onions readily absorb the odors around them.
If you store carrots and onions together, your onions may end up smelling and tasting like carrots, which isn’t what you want in your soups or stews.
3. Different Humidity Needs
Carrots and onions need very different humidity levels to stay fresh.
Carrots like high humidity and do best in a sealed bag or container in the fridge.
Onions, on the other hand, need dry, well-ventilated conditions and should never be kept in a sealed plastic bag.
When you try to store carrots and onions together, one of them will always suffer because their ideal conditions are complete opposites.
4. Different Temperature Preferences
Temperature is another reason you shouldn’t store carrots and onions together.
Carrots stay crisp longest in the cold fridge, ideally between 32°F and 40°F.
Onions prefer a cool, dry spot around 45°F to 55°F with good airflow.
Put onions in the fridge, and they get mushy and moldy.
Leave carrots out at room temperature, and they turn rubbery within days.
Because they need different temperatures, storing carrots and onions together just doesn’t work.
What Happens When You Store Carrots and Onions Together
If you ignore the warnings and store carrots and onions together anyway, here’s what you can expect:
1. Faster Spoilage All Around
The ethylene from onions speeds up the aging of carrots.
Meanwhile, the moisture from carrots encourages mold and soft spots on onions.
Instead of lasting weeks, both vegetables may start going bad within a few days.
2. Flavor Transfer
Onions pick up flavors and odors from whatever is nearby.
Store carrots and onions together, and your onions may take on a sweet, earthy carrot taste while your carrots may develop a sharp oniony bite.
Neither result is pleasant, especially if you’re planning to use them in separate dishes.
3. Mold and Rot Spread Quickly
When one carrot or onion starts to go bad in a shared space, the mold and bacteria spread fast.
A single soft onion can ruin the whole batch of carrots stored with it.
That’s another reason it’s better to keep carrots and onions separate.
How to Store Carrots and Onions Separately
Now that you know why you shouldn’t store carrots and onions together, here’s how to store each one properly:
1. Storing Carrots
Cut off the leafy green tops first, because they pull moisture from the roots.
Then place carrots in a sealed bag or container with a slightly damp paper towel in the crisper drawer of your fridge.
This keeps humidity high and helps carrots stay crisp for weeks.
2. Storing Onions
Keep onions in a cool, dark, dry place with plenty of airflow, like a mesh bag or a basket in your pantry.
Never put whole onions in the fridge, and never seal them in plastic.
If you have cut onions, wrap them tightly and use them within a few days.
3. Keep Them Far Apart
Even in the same room, keep carrots and onions at least a few feet apart.
This reduces the chance of ethylene gas affecting your carrots and moisture reaching your onions.
If you have a separate pantry shelf, use it for onions and save the fridge for carrots.
So, Can Carrots and Onions Be Stored Together?
Carrots and onions should not be stored together because onions release ethylene gas that spoils carrots, while carrots release moisture that ruins onions.
They also need different humidity and temperature conditions, so keeping them side by side only shortens their shelf life.
Store carrots in the fridge in a sealed bag and onions in a cool, dry, ventilated spot instead.
That way, can carrots and onions be stored together will never be a question you have to ask again, because you’ll already know the answer is no.