Freeze Drying vs. Canning: Which Is Better?

Freeze drying and canning can both turn seasonal produce, bulk grocery purchases, leftovers, and other foods into something you can store for later.

But the two methods preserve food in very different ways.

Canning uses heat and a controlled process to create shelf-stable food inside sealed jars.

Freeze drying freezes food and removes most of its water under vacuum, creating dry, lightweight food that can be packaged for shelf-stable storage.

So which is better?

For households looking for the greatest versatility, long-term storage, lightweight food, and the ability to preserve everything from fruits and vegetables to meats and complete meals, freeze drying has some significant advantages.

Canning still makes a lot of sense for certain foods. It's inexpensive to get started, has been used successfully for generations, and works especially well for foods such as sauces, jams, salsas, and other recipes designed for canning.

The better choice ultimately depends on what you're preserving and how you want to use it later.

The Short Answer

Choose freeze drying when you want to preserve a wide variety of foods, including fruits, vegetables, meats, dairy, eggs, leftovers, and complete meals; want food that's lightweight and easy to store; or want to build longer-term shelf-stable food storage.

Choose canning when you want a lower-cost way to make suitable foods shelf-stable, enjoy the characteristics of canned foods, and are comfortable following research-tested recipes and processing procedures.

Use both when there are certain foods you prefer canned and others you'd rather freeze dry.

A jar of tomato sauce and a pouch of freeze-dried strawberries don't necessarily need to compete. But if you're looking for one method that gives you the flexibility to preserve an especially broad range of foods, freeze drying is hard to beat.

Freeze Drying vs. Canning at a Glance

Both methods can have a place in a home pantry. But they produce very different results.

How Does Canning Preserve Food?

Home canning places food into jars and uses a research-tested heat process appropriate for the food.

The processing method depends heavily on acidity.

High-acid and properly acidified foods may be processed using approved boiling-water or atmospheric steam-canning methods when an appropriate research-tested process exists.

Low-acid foods require pressure canning using appropriate tested procedures.

That distinction is important because low-acid foods can provide conditions in which Clostridium botulinum can grow and produce botulinum toxin if the food is improperly processed.

With home canning, recipes and processing procedures shouldn't be improvised. Current research-tested recipes and processing instructions should always be followed.

How Does Freeze Drying Preserve Food?

Freeze drying works differently.

Food is first frozen. Under reduced pressure, frozen water in the food is then removed primarily through sublimation, in which ice changes directly into water vapor without first becoming liquid.

Moisture plays a major role in food spoilage. Bacteria, mold, and yeast need available moisture to grow, and water also contributes to chemical and enzymatic reactions that affect food quality over time.

Freeze drying removes most of that moisture, helping slow microbial growth and many of the changes that cause food to deteriorate.

Once food is completely freeze dried, appropriate packaging helps protect it from moisture and oxygen during storage.

Freeze drying should not be considered a sterilization process. Begin with safe food, follow good sanitation and preparation practices, make sure food is completely dry, and package and store it appropriately.

Which Method Preserves Food Longer?

Both methods make it possible to store food without continuous refrigeration, but long-term storage is one of freeze drying's major strengths.

When food is completely freeze dried, appropriately packaged, and stored under suitable conditions, many foods can last for years, with some lasting up to 25 years.

Canned food is also shelf-stable when it has been safely processed and sealed, making canning a useful option for normal pantry storage and rotation.

The difference becomes more meaningful when you're planning farther ahead.

Freeze drying removes most of the moisture from food, and appropriate packaging can protect it from moisture, oxygen, and light. That makes freeze drying particularly useful when extended shelf life is one of your goals.

Which Method Preserves More Nutrients?

Freeze drying has an important advantage here because of the way the food is processed.

Freeze drying can preserve nearly all of the nutritional value of many foods, although the exact amount varies depending on the food and the nutrients being measured.

Different nutrients respond differently to processing. Some vitamins are more sensitive to heat, oxygen, and storage conditions, while protein, fiber, minerals, and other nutrients are generally more stable.

Canning uses substantial heat as part of the preservation process. While canned foods can still be nutritious, that heat can affect some heat-sensitive nutrients.

Because freeze drying removes water at relatively low product temperatures, it can retain many nutrients very well while preserving the food for long-term storage.

The important takeaway is that freeze drying is highly effective at preserving both food and much of its original nutritional value.

Which Method Better Preserves Taste and Texture?

The two methods create very different foods.

Canning cooks food during processing. Fruits and vegetables generally become softer, and the finished food takes on the familiar texture and flavor associated with canned foods.

Sometimes that's exactly what you want. Tomato sauce, salsa, jam, canned peaches, and similar foods are good examples.

Freeze drying preserves much more of the food's physical structure.

Many fruits, vegetables, and other foods become crisp when freeze dried and can be eaten that way as snacks. Other foods, including meals, meats, and vegetables, can be rehydrated.

Not every food returns to exactly its original texture after rehydration, but freeze drying gives you more ways to use the finished food.

You can eat many foods dry, rehydrate them, add them to recipes, or use them in complete meals.

Which Method Can Preserve More Types of Food?

This is one of freeze drying's biggest advantages.

A home freeze dryer can preserve a remarkably broad range of foods, including:

• Fruits

• Vegetables

• Cooked meats

• Dairy products

• Eggs

• Grains

• Beans

• Complete meals

• Leftovers

• Sauces

• Desserts

• Candy

• Ice Cream

• Snacks

Not every food is a good candidate for freeze drying. Foods that are almost entirely fat or very high in sugar can present challenges.

But compared with canning, freeze drying gives households considerably more flexibility in what they can preserve.

Canning can preserve a broad range of foods too, but safe home canning is limited to foods and formulations for which an appropriate tested process exists.

You can't simply put any family recipe into a jar and invent a processing time.

What About Complete Meals and Leftovers?

This is another area where freeze drying really stands out.

Families don't only need to preserve individual fruits and vegetables. Sometimes you want to save:

• Chili

• Soup

• Casseroles

• Pasta dishes

• Breakfast foods

• Cooked meats

• Leftovers

• Entire meals

Some soups and meal components can be canned when an appropriate tested recipe exists.

Freeze drying gives you considerably more flexibility.

A wide variety of appropriately prepared meals and leftovers can be freeze dried and stored for later. That can be useful for everyday meal planning, camping, emergency food storage, or simply keeping extra food from going to waste.

Instead of limiting preservation to foods that fit a specific canning recipe, freeze drying opens the door to preserving many of the foods your family already eats.

Which Takes More Time?

Both methods require time, but the time is spent differently.

Canning involves preparing the food, preparing and filling jars, managing the canner, processing, cooling, and checking seals.

Freeze drying involves preparing food, loading trays, starting the freeze dryer, verifying that the food is completely dry when the batch finishes, and packaging it.

A freeze-drying batch can take many hours, but much of that is machine time rather than continuous hands-on work.

Canning generally processes food more quickly, but a canning session can require more concentrated hands-on attention.

For someone who likes the idea of loading trays, pressing Start, and letting the freeze dryer handle the process, that difference can be significant.

Which Uses More Storage Space?

Canning requires jars.

Glass jars are durable and reusable, but they're also heavy, take up shelf space, and can break.

Freeze-dried food can be stored in Mylar bags, jars, or other appropriate airtight containers.

Because most of the water has been removed, freeze-dried food is extremely lightweight.

That makes it particularly useful for:

• Camping

• Backpacking

• RV travel

• Emergency kits

• Transportation

• Situations where storage weight matters

And unlike frozen food, it doesn't require freezer space.

Which Is Better During a Power Outage?

Once properly preserved, both canned and freeze-dried foods have an important advantage over frozen food:

They don't depend on a running refrigerator or freezer for storage.

That's valuable for emergency preparedness and for anyone trying to reduce dependence on freezer capacity.

Home freeze drying requires electricity while the freeze dryer is operating, and canning requires an appropriate heat source during processing.

But once the preservation process is complete, neither properly canned nor appropriately packaged freeze-dried food normally requires continuous refrigeration.

Freeze-dried food has the additional advantage of being lightweight and easy to move if necessary.

Which Method Costs Less?

Canning clearly costs less to get started.

Someone can begin home canning with a much smaller equipment investment than purchasing a home freeze dryer. Jars can also be reused when they're in good condition, although lids and other supplies create ongoing costs.

A freeze dryer requires a larger upfront investment, along with ongoing costs such as electricity, packaging, oxygen absorbers, and maintenance.

But upfront cost isn't the only way to look at value.

A freeze dryer can be used throughout the year to preserve produce, grocery purchases, foods bought on sale or in bulk, leftovers, complete meals, snacks, camping and backpacking meals, pet treats, and many other foods.

It can also replace some commercially freeze-dried foods and help keep food that might otherwise be thrown away from going to waste.

The more food a household preserves and the more consistently the freeze dryer is used, the greater the opportunity for that initial investment to pay you back over time.

When Canning May Be the Better Choice

Canning may make more sense when you want a low-cost way to begin preserving food, already own and enjoy using canning equipment, or regularly make foods that are particularly well suited to tested canning recipes.

Tomato sauce, salsa, jams, jellies, pickles, and other foods traditionally preserved in jars may be exactly what you want.

Canning can also be convenient when you want food that is ready to eat without rehydration.

There is nothing wrong with using canning where it works well.

When Freeze Drying May Be the Better Choice

Freeze drying has a strong advantage when you want greater flexibility in what you preserve.

It may be the better choice if you:

• Want to preserve a particularly broad variety of foods

• Want to preserve complete meals and leftovers

• Want food that can be stored for years

• Want lightweight food

• Want to reduce dependence on freezer space

• Want to retain many of the characteristics of the original food

• Want to preserve foods with less exposure to high heat

• Regularly buy food in bulk or take advantage of sales

• Want to make your own snacks, camping meals, or pet treats

• Regularly purchase commercially freeze-dried foods

• Preserve enough food to make the equipment investment worthwhile

The biggest advantage isn't any one of these things by itself.

It's the ability to do all of them with one preservation method.

Can You Use Canning and Freeze Drying Together?

Absolutely.

Owning a freeze dryer doesn't mean you have to stop canning.

There may still be foods you prefer canned because you like the result or because canning is particularly well suited to them.

You might can tomato sauce and freeze dry sliced tomatoes.

Make jam from some strawberries and freeze dry the rest for snacks.

Can salsa and freeze dry complete meals.

The question doesn't have to be which method gets every food.

Use the preservation method that gives you the result you want.

So, Is Freeze Drying Better Than Canning?

For many households looking for the most versatile food-preservation option, freeze drying has the advantage.

Canning costs less to get started and remains an excellent choice for foods that are well suited to tested canning recipes.

But freeze drying can preserve a much broader variety of foods, including complete meals and leftovers. It produces lightweight food, doesn't rely on prolonged high-temperature processing, can retain much of the food's original nutritional value, and offers excellent long-term storage potential.

It also gives you more flexibility in how you use the food later. Many foods can be eaten dry, rehydrated, added to meals, packed for camping or travel, or stored for the future.

Canning still has a place.

But if you're looking for one preservation method that can handle an exceptionally wide variety of foods and uses, freeze drying is hard to beat.

Frequently Asked Questions

Does freeze drying kill bacteria?

Freeze drying should not be considered a method for killing bacteria or sterilizing food. Microorganisms can survive freeze drying, which is why safe food handling and preparation still matter.

Does freeze-dried food last longer than canned food?

Freeze drying is particularly well suited to long-term storage. When completely freeze dried, appropriately packaged, and stored under suitable conditions, many foods can last for years, with some lasting up to 25 years. Shelf life still depends on the food, packaging, moisture, oxygen, temperature, and storage conditions.

Is freeze drying healthier than canning?

Freeze drying can preserve nearly all of the nutritional value of many foods. Because it removes moisture at relatively low product temperatures, it can have an advantage for some heat-sensitive nutrients compared with the higher-temperature processing used in canning.

Is canning cheaper than freeze drying?

Yes. Canning requires a much smaller initial equipment investment. The long-term value of a freeze dryer depends on how much and how often it is used, including food waste avoided and foods or purchases it may replace.

Can I freeze dry foods that cannot be canned?

In many cases, yes. Freeze drying can accommodate a much broader variety of foods and complete meals because it doesn't depend on a tested canning recipe for each food. However, not every food is a good candidate for freeze drying, and normal food-safety practices still apply.

Should I buy a freeze dryer if I already can food?

It depends on what else you want to preserve. If you want to preserve complete meals, leftovers, a broader range of foods, make lightweight snacks or meals, reduce freezer use, or build longer-term food storage, a freeze dryer can add capabilities that canning doesn't provide.