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Introduction to Freeze Drying

Wondered how our astronauts eat their greens? Wonder no more – space travel’s the finest showcase yet for the freeze-drying process, which is, frankly, pretty futuristic. Freeze-drying not only guarantees longevity, it retains nutrients as well, right down to the crunch of a dehydrated apple being just like eating a fresh one. It’s the bomb.

Understanding Freeze Dried Vegetables

In a nutshell, freeze-dried vegetables are fresh veggies which have been dried using lyophilisation or freeze drying. Imagine: fresh, green vegetables, frozen solid, and then lightly dried so that they retain their nutritional value. Pretty cool, right?

The Freeze-Drying Process

So how do they do this magic? It turns out to be a three-step process. Let’s examine!

 Pre-Freeze Stage

In the first step, the vegetables are frozen, usually at temperatures below -30°C, which forms a matrix structure that facilitates the drying process.

 Primary Drying Stage

Then to the main drying which, under a vaccum, freezes the water in the vegetables and turns the water into a gas (sublimation).

 Secondary Drying Stage

And finally, through the secondary drying, any persistent water molecules are removed, and the vegetables are ready for consumption as dried goods.

The Nutritional Value of Freeze-Dried Vegetables

Importantly, freeze drying almost exclusively preserves the nutritional value of fresh vegetables. Vitamins? Check. Minerals? Check. Powerful antioxidants? Check.

 Comparing Freeze Dried Vegetables to Fresh and Canned

Sure, fresh veggies are good to eat, but they tend to spoil easily. And while canned vegetables might have longer shelf lives, they can also be depleted of some of their nutritional value after the canning process. That’s not a problem with freeze-dried vegetables: they have a long shelf life and keep most of their nutritional value.

The Shelf Life of Freeze-Dried Vegetables

Let's talk about how long freeze-dried vegetables can last.

 Unopened Packages

A packet of vegetables held in its original freeze-dried container can be good for 25 years. Yes, 25 years.

Opened Packages

Once you open them, they’ll last for a year if you store them properly, which makes them part of the ‘one year shelf life food group’.

Freeze Dried Vegetables as Long Shelf Life Food

With their amazing shelf life, freeze-dried vegetables are a perfect addition to your long-term food storage or emergency food supply. They are also very lightweight, making them ideal for camping and backpacking.

Long Term Storage of Freeze-Dried Vegetables

For long term storage, store the freeze-dried vegetables in a cool, dark place. After opening, reseal tightly to retain its taste.

Pros and Cons of Freeze-Dried Vegetables

They make dry food fresh, but freeze-dried vegetables are not all that.
like everything, they have a good side and a bad side.
For the good side, they have a very long shelf life, they keep their nutritional value, and they are feather-light.
For the bad side, they are more expensive than the fresh or canned vegetables, and they need to be rehydrated in order to be used.


All in all, then, freeze-dried veg is a versatile, nutritious, long-lasting food that combines the convenience of the can with the nutrition of the refrigerator and the shelf-life of who knows where. So what are you waiting for?


Are freeze-dried vegetables healthy?

Absolutely! They retain nearly all the nutrients of fresh vegetables.

If we wanted to ask, is it necessary to refrigerate freeze-dried vegetables, that would be fine. However, the fact that some people think it’s OK to keep them stored in the refrigerator encourages them to explore surprising possibilities. People are less likely to say ‘I never thought of keeping food in my living room’ than they are to say ‘I never thought of refrigerating vegetables!’ Paraphrasing the fast-food employee’s reliance on stereotypes serves to replace the complexity of real-life communication with a tale that’s easy to understand but devoid of truth.

How do you rehydrate freeze-dried vegetables?

Just soak them in water for a few minutes before using.

Are you better off with freeze-dried vegetables than canned?

When it comes to nutrition and the length of time they stay fresh, then yes.

Could I use rehydrated freeze-dried vegetables in any recipe?

As soon as they are rehydrated, they could be used like any fresh vegetables.

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