How to Dry Green Onions or Scallions (Oven & Dehydrator)

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Whether you’re growing green onions in your garden or you have too many from the store, you can extend their life by drying them! Drying green onions takes minimal effort and a little time to restock your spice cupboard from scratch. Follow these to learn how to dry green onions with your oven or dehydrator.

jar of dehydrated green onions made in oven.

One crop that’s always in my spring garden is onions! I like to buy onion sets and plant them close together. As they grow, I thin them out and use the smaller bulbs as green onions for salads, dressings, or for preserving. Those fresh spring onions taste absolutely amazing, and dehydrating really concentrates that fresh, delicious flavor for later. We love to sprinkle the green onion powder over cheesy scrambled eggs or stir it into quiches and frittatas!

Once you try this method the first time, you’ll want to dehydrate your own green onions every year. Plus, you don’t even need a dehydrator if you don’t have one! It’s such an easy method, and you’ll want to use it again and again.

Can you dry green onions?

Absolutely! Just like other members of the allium family (think garlic, onions, and shallots), green onions are great dehydrated or dried. The drying process removes any moisture and leaves just the onion behind. It’s a great way to preserve an abundance of green onions for later. Just be sure to dry a bunch because they become much smaller after you dry them!

Why you’ll love drying green onions & scallions


  • DELICIOUS HERBY FLAVOR – The drying process concentrates that herby, oniony flavor. These dried green onions are fantastic for adding to soups, dips, scrambled eggs, and more!
  • GREAT WAY TO PRESERVE THE HARVEST – If you are lucky enough to have too many immature onions in your garden beds or find a great deal at the farmers market, dry them for later! Once dehydrated, they’ll stay fresh for a year or longer. 
  • REDUCE FOOD WASTE – Out of time to use up your fresh green onions? Dry them up to prevent them from rotting away in your fridge. Make sure to only dry fresh, firm green onions without signs of rot or decay.
dehydrating green onions on a tray in the oven.

Equipment

Learn how to dry green onions in your oven. It’s an easy way to preserve green onions, especially in the springtime! You’ll need:

Oven Method

  • Baking tray
  • Parchment paper (silicone liners are not recommended for this)
  • Scissors
  • Airtight container for storage

Dehydrator Method

  • Food dehydrator with trays
  • Kitchen scissors
  • Glass jars or storage
trimming green onions for dehydrating.

Ingredients

  • Fresh green onions or scallions – The onions should be very fresh and clean with no signs of mold or rust. Wash and dry them completely first. It’s best to separate the green and white sections as the green parts will dry much faster than the white parts!

How many scallions do I need?

To fill a small spice jar, you’ll need to dry approximately 6-10 green onions depending on size. For green onion powder, you’ll need closer to twice as much.

How to Dry Green Onions without a Dehydrator (Oven Method)

  1. Turn on your oven to the lowest setting. For most, this will be around 170 degrees Fahrenheit.
  2. Prepare your baking tray by putting a sheet of parchment paper on top.
  3.  Rinse your green onions and pick away any decaying sections.
  4. Using your scissors, cut the green parts of the onions directly over the sheet tray. Cut pieces that are no larger than 1 cm. If you want to dry the white portion as well, cut it as thinly as possible.
  5. Feel free to make a smaller batch or to cut more green onions to fill the tray. Be sure to leave some space between the pieces for air to circulate.
  6. Place the tray in your oven. Consider cracking the oven door open by sticking a wooden spoon between the door and the oven. Green onions dehydrate best around 100 degrees.
  7. Every hour, stir the green onion pieces to ensure even drying.
  8. Allow the green onions to dry all the way. This may take 3 hours or more. You can tell the onions are dry if they crumble when pressed.
  9. Fold one side of the parchment paper over the other and press down on the paper to break the green onion pieces into small flakes. You can also press them in your hand or loosely crush them with a mortar and pestle.
  10. Allow the greens to cool completely and store them in an airtight container.
tray of sliced green onions for dehydrating.
Tip: Separate the greens and the whites! They dry at different speeds.

How to Dehydrate Green Onions in the Dehydrator

  1. Arrange the sliced green onions in a single layer on your dehydrator trays.
  2. Dry at 135 degrees F for 3-5 hours until fully dried. They should crumble when you crush them.
  3. Either keep the onions whole or crush or crumble them for storage. 
  4. Place them in an an airtight container and use as desired.

drying green onions ion a tray in the oven.
Even though you see me using a silicone liner here…don’t follow my lead! The onion powder ended up sticking and I lost a bunch.

How to Make Green Onion Powder or Flakes

Once you’ve dried your green onions, you have a couple of choices about how to store them.

  • Store your dried green onions as large flakes.
  • Break them down into a powder.

To store your dehydrated scallions as a powder, pour all of your dried green onions into your food processor. Pulse until they create a fine powder. You could hand crush them in your mortar and pestle instead. Store in an airtight jar or bottle. 

Instead of pulsing or crushing your dehydrated green onions into a powder, you can also rough crush them. Try folding your parchment paper in half with the dried green onions inside. Press down on the paper with the heel of your palm until your green onions are flakes. Store in an airtight jar.

Storing Dried Green Onions

Once the dried greens are fully dried and cooled, you can store them in an airtight container. I like to use glass mason jars, although you can also vacuum seal them in plastic bags. Just like other spices, they will last for months! Our dried celery and green onions have actually lasted us for years.

It can help to add an oxygen absorber to absorb excess moisture during storage.

Tips for Drying Green Onions

  • Use scissors. It’s much easier to cut the green onions with scissors than a regular knife!
  • Store them out of direct sunlight. The sun will degrade the quality of your dehydrated food. Always store your products in a cool, dry place out of direct sunlight for the longest shelf life.
  • Dry all the way. It’s very important to make sure the chopped green onions are fully dried before removing them from the oven or dehydrator. Make sure they crumble in your hand! If there is any excess moisture, they can rot and ruin the finished product in storage.

How to Use Preserve Green Onions

There are several great ways to preserve green onions! My favorite is to dehydrate green onions to use for cooking later.

  • We also love to make this green onion salt.
  • You can even trim the green onion whites into pieces and freeze them for later.
  • Make green onion pesto! It has some bite but is so incredibly tasty.

FAQs

Can I dry the whites of green onions?

You definitely can! The whites of the onion will give your green onion powder a nice bite. If you dry the greens and the whites together, the greens will typically dry faster.

You can avoid this issue by cutting the white portion of the green onion thinly. Another option is to remove the dried green onion portions when they are done and allow the whites to stay in the oven longer.

Some people like to dry the whites and greens separately. They save the greens for green onion powder, and they use the whites like regular onion powder!

What are the best types of green onions for drying?

I love this question! As a home gardener, i like to get into the specifics about which types to grow. Another question I’m often asked is if you can dry any types of onion or if they have to be scallions.

You’ll love this easy answer: you can dry any onion greens. (Red, yellow, white, scallions, storage onions, sweet onions, etc).

The only thing you need to know is that the greens still need to be fresh. The perkier, the better! This is best done with the onions are still young as the greens can start to dry out and thicken as the plants age. Do not dehydrate green onions that are going bad and I wouldn’t recommend processing green onions that have onion rust or other problems.

The best dried green onion powder comes from sweet onions though. Think Alisa Craig or Vidalia. All of that sweetness gives the green onion powder even more flavor and dimension. They’re absolutely delicious!

We love to plant onion sets or starts in the spring. They’re a great plant for beginner gardeners! We plant them really close to each other…like 2-3 inches apart. The little plants will grow quickly and we pull out the fastest growers to eat as spring onions. This gives the other plants a little more space to grow.

How long does it take to dehydrate green onions in the oven?

This depends on your oven, but it typically takes about 3-5 hours to dehydrate green onions in oven. Don’t rush the process. You want to dry green onions at the lowest temperature possible. For home ovens, that’s usually 170 degrees.

How do you dehydrate scallions?

Simply trim your green onions into 1 cm pieces and dry them on a sheet tray in the oven for 3-5 hours. Use the lowest oven temperature possible and consider cracking the door. You can also dehydrate them in the dehydrator at 135 degrees F for 3-4 hours.

Related Recipes

Dehydrated Green Onions (Oven or Dehydrator)

Learn how to dry green onions in the oven or dehydrator! Drying green onions is a great way to preserve them or to make green onion powder. The prep time is minimal and most of the time will be used for drying. This is an ideal project for a rainy weekend!
5 from 2 votes
Prep Time 5 minutes
Cook Time 10 minutes
Drying Time 3 hours
Total Time 3 hours 15 minutes
Course Food preservation, Seasoning, Spices
Cuisine American

Equipment

  • 1 Baking tray With parchment paper
  • 1 Pair of scissors

Ingredients
  

  • 6-10 Green onions

Instructions
 

  • Turn your oven on the lowest setting.
  • Prepare your baking tray by adding a piece of parchment paper.
  • Rinse your green onions. Remove any decaying parts.
  • Using your scissors, trim the onion greens into 1 cm pieces directly over your baking tray. Spread the green onion pieces evenly on the tray.
  • Place the tray in the oven. Crack the oven door open to reduce the temperature by placing a wooden spoon or ball of aluminum foil between the oven and the door.
  • Allow to dehydrate for 3-5 hours. Consider stirring every hour.
  • Check the dryness by crushing the pieces between your fingers. If they crumble, they are done.
  • Remove from oven when fully dried. Allow to cool completely before storing in an airtight container.

Notes

This recipe recommends enough green onion powder to fill a small spice jar. Once you grind down your dehydrated green onions into a powder, you’ll be surprised at how little it makes!
Feel free to dry however many green onions you have on hand.
*A note on using a silicone tray liner.* Although we love our silicone tray liners for many reasons, the fine green onion powder will stick to the liner and can be hard to remove. 

How to Make Green Onion Powder

Pulse the dried green onions in your food processor or crush them with a mortar and pestle until they are a powder. Pour into a sealable jar.
Keyword dehydrated scallions, dehydrated spring onions, dried green onion, dried scallions, dried spring onions, green onion powder, scallion powder
Did you try this recipe?Be sure to leave a star rating!

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2 Comments

  1. 5 stars
    What a great step-by-step approach! This is so helpful and a great skill to add to my homesteading playbook. 🙂 We work so hard to grow our gardens, when we can learn ways to keep those foods to enjoy longer it is a very good thing.
    So glad I saw this on the Homestead bloghop!

    1. Tracy Lynn, I’m so glad this is helpful! I’m always surprised just how much you can do with simple processing methods like this. The hardest part of this recipe is just being patient! Thanks for your visit! So nice to meet you. 🙂

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