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Dehydrating Onions

Learn how to dry onions in a food dehydrator or in the oven.
an up-close image of dehydrated onions in a glass bowl

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Dehydrating Onions is such a simple way to preserve this delicious pantry staple! Learn how to dry onions in a food dehydrator or in the oven.

an up-close image of dehydrated onions in a glass bowl

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Onions are a staple in so many kitchens for a reason. This incredible ingredient adds so much flavor to all kinds of recipes. While fresh storage onions can last for a while, dehydrating onions will extend the shelf-life tenfold.

If you’re a huge onion fan (and who isn’t?), check out our posts on Instant Pot French Onion Soup, Gluten-Free French Fried Onions, and Instant Pot Caramelized Onions.

And if you don’t have a dehydrator, this tutorial on How to Freeze Onions will be right up your alley.

I have owned this dehydrator for at least a dozen years, and it has held up beautifully. I’ve added additional trays over the years and it is a workhorse in summer and fall, meaning I can dehydrate oregano, dehydrate mint, drying rosemary, drying peaches, dehydrate marshmallows, dehydrate garlic, dehydrate basil, dehydrate tomatoes, dry pears, and dehydrate apples. That’s what is called a preserving win.

a before and after photo of onions on round dehydrator trays

HOW LONG DOES DEHYDRATED Onion LAST?

As long as it is stored in a cool and dry place, your dehydrated onions will be good for years. Make sure the dried onions are fully cooled before putting them into an air-tight container. As it cools it will release heat that could result in condensation and eventually cause the onion to mold.

 

Pro Tips/Recipe Notes

  • Avoid the temptation to increase the heat on the dehydrator or oven to speed up the process. Low and slow wins in the race on this one.
  • If possible, move your dehydrator outside to a safe covered space. The smell of drying onion can be overwhelming to many people.
  • The onions are ready when pieces of it break or snap instead of bend. If your pieces are thinner, it will feel papery when ready.
  • (optional) add a bit of uncooked dried white rice to a powerful blender to make onion powder. The rice will help keep the onion powder from clumping together.

More Delicious Preserving Recipes

dried onions in a glass bowl with yellow and purple onions on a white board

an up-close image of dehydrated onions in a glass bowl
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Dehydrating Onions

Learn how to dry onions in a food dehydrator or in the oven.
Prep Time15 mins
Drying Time12 hrs
Total Time12 hrs 15 mins
Course: How To
Cuisine: American
Keyword: dry onions, how to dehydrate onions, how to dry onions, onion dehydration
Calories:

Ingredients

  • onions

Instructions

  • Remove the tops and skins.
  • Cut in half and then make slices ~3/8 inches thick.
  • Arrange the slices on your dehydrator so that there is space around each slice, and the slices are not touching.
  • Set your dehydrator to the "fruit/vegetables" setting (or 135 degrees F).
  • Rotate trays every few hours.
  • Onions are ready when pieces of it break or snap instead of bend. If your pieces are thinner, it will feel papery when ready. (6-12 hours depending on conditions)

Notes

  1. If possible, move your dehydrator outside to a safe covered space. The smell of drying onion can be overwhelming to many people.
  2. Dried onions are 3-4 times stronger than fresh.
  3. Dried onions will rehydrate to ~80% of the original size when soaked in water for 30 minutes to 2 hours.
Oven-Drying Instructions: Follow the cutting instructions above and then place onion slices on baking drying racks set in baking sheets.
Place in the oven at the lowest temperature possible (usually 140-170 degrees F) and prop open the door with the handle of a wooden spoon. This allows condensation to escape instead of just settle back onto the onions.
 
Bake for 5-8 hours.

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