10 Things to Know Before You Start Dehydrating Food

The Beginner’s Guide to Dehydrating


To put it simply-I love food. And, I knew backpacking for five months would make meal times interesting. Dehydrated meals do not have to be boring—creativity is key. Before diving into my recipes and concoctions, lets chat about the details of dehydrating. For starters, here are ten things to know about making DIY Dehydrated meals.  You can also learn about our favorite commercial dehydrated meals.

1. Materials

You don’t need a dehydrator. Interestingly, a propped open oven or toaster oven at the lowest setting (140-170°F is a typical range) can be used to dehydrate most food. Keep in mind the oven’s cook time is faster than a dehydrator so the recipe should be adjusted. In fact, many recipes include both a dehydrator and oven steps. However, I’ve found a dehydrator makes the process easier. Below is the list of supplies I use to dehydrate meals:

2. Vacuum-Sealed Bags

In order to store dried food safely, the National Center for Home Food Preservation advises to:

  • After dehydrating, cool food completely (warm food=bacteria)
  • Dehydrated food can be stored in either (1) clean canning jars, (2) freezer tupperware with locking lid, (3) freezer bags or (4) vacuum seal
  • Store in cool, dry and dark areas
  • Generally, dehydrated products can last 6 months at 80°F or 1 year at 60°F

Knowing this, I decided to vacuum seal all my dehydrated food items for the trail. The Food Saver V3240 Vacuum Sealer served as a small investment to preserve hundreds of dollars of dehydrated food. I highly recommend vacuum sealing as I believe its the best method to  prevents moisture from reentering the bag, which causes the food to spoil. Conversely, the food has to be completely dehydrated for vacuum sealing to work– if there is moisture or condensation, bacteria can grow.

3. Food Safety

The goal of dehydrating:

  • Dehydrate at a high enough temperature to destroy the enzymes and microorganisms that contribute to harmful bacteria growth
  • Remove moisture at a high enough temperature to prevent harmful bacteria growth BUT not so hot that it impacts food quality like nutrients, flavor and color
  • Safely store food items, avoiding moisture reabsorption

Depending on the food item, care has to be taken before, during and after drying. Typically, the water content of dehydrated food ranges from 5 to 20 percent. Here, it’s important to remember that preparation is unique to each food item. Thus, researching how to dehydrate a specific food item will provide greater detail.

4. Vegetables

Dry Time: 125-135°F for 8-12 hoursimg_7623

A general rule of thumb for dehydrating- if you eat it raw then there is no need to pre-cook the food before the drying. Vegetables like corn, broccoli and celery require blanching before dehydrating. Blanching is cooking the food item in boiling water then putting it in cold water. Further, the blanching step denatures enzymes that would impact the shelf-life and quality of the veggie. For vegetable specific dehydrating instructions, check out this step by step guide.

If this all sounds too complicated, then dehydrating frozen vegetables may be for you! Frozen vegetables are already pre-cooked/blanked and ready to dehydrate as is.

Have you thought about turning dried veggies into a powder? I found the product rehydrates better after it goes through a spin in the food processor but missed the texture of veggies. Just some food for thought.

5. Fruit

Dry Time: 135-145 for 8-15± hours 

Before dehydrating, certain fruits like bananas and apples should be treated with a citrus wash to delay browning. As fruit varies, I recommend looking up food specific recipes to yield the best results.

After drying, fruit’s moisture content should be around 20%. Because the fruit will dry unevenly (despite all your best efforts), it does requires an extra step before storing. Once the fruit cools completely and I mean totally cool, store in plastic bags or glass jars for 7-10 days, shaking daily. After this additional drying step, the fruit can be stored as is or ground up into a powder. In this time, condensation should not develop. If it does, too much moisture! So, back to the dehydrator it goes. Remember, water=bacteria=you getting sick or stuck with moldy food you just spent a lot of money on.

6. Jerky

Dry Time: 160°F for 4-8 hours

Prior to the trail, I was a vegetarian. The smell of trail magic hot dogs and cheeseburgers tempted me up until Trail Days and out went my vegetarian ways. Therefore, I do not have any experience making home made Jerky. But, I do know making home made Jerky can pose the risk of harmful bacteria.

The USDA Jerky and Food Safety Fact Sheet highlights how the bacteria in meat can survive the temperatures of a dehydrator (150-160°F) when cooked at a warm temperature for a long period of time. In order to minimize the risk of food born illnesses from  E. coli 0157:H7 and Salmonella, meat and chicken needs to be pre-cooked respectively to 160°F  and 165°F  prior to dehydrating.  This extra step destroys harmful bacteria from growing that would survive under a dehydrators temperature settings. Apparently, home made jerky’s shelf life is 1-2 months; whereas, store bought Jerky expiration dates vary from 8 months-1 year.

7. Grains

→Dry Time: 135-145 for 6-12 hours img_7632

Whole Grains are sources of complex carbohydrates on the trail. However, grains like Quinoa often take too long to cook and aren’t efficient for backpacking travel. BUT, precooking and dehydrating the grain is the answer to this problem! Win for healthy food. Need instructions? Check out this DIY Grain Dehydrating Guide

8. Beans, Beans the Magical Fruit

→Dry Time: 95-105 for 6-8 hours 

As a former vegetarian, beans were a great source of protein in my DIY backpacking meals. Beans can either be cooked (found in a can) or dried. I choose to buy bags of dried beans because its cheaper and used this helpful guide to drying cooked and dried beans . My personal favorite- dehydrated refried beans. Also, I grind my beans up into a food processor to make bean powder before storing.

9. Do Not Dehydrate….

Avoid dehydrating foods high in fat like avocados, butter, milk and non-lean meats. The fat content causes the food to go rancid quickly and it’s better to consume the food as is. Personally, I choose not to dehydrate these but I’m sure a google search has the answers on how to DIY these. Instead, I buy them commercially.

10. Butter, Cream, Mac and Cheese Powder!

img_7625My favorite dehydrated food add-on items. Expensive, yes, worth it, definitely.

There’s the core four in my delicious DIY meal kit. Most hikers carry olive oil to add to pasta sides or meals but let me tell you, this stuff is way better. I actually use the cheese powder at home for mac and cheese because it’s that good. On the trail, I’d pair the butter, cream, and Big Daddy Mac Mix with dehydrated quinoa, vegetables and beans. This meal was packed with nutrients and tasted amazing thanks to the delicious diary powders! I can say meals were more bland when we didn’t add in our cheese or butter pow. Plus-dehydrated butter is lighter than olive oil and 1 tsp has 100 calories and 10.3 grams of fat!

You have made it to the end of my Beginner’s Guide to DIY Dehydrating.

I know, it’s overwhelming how much information there is for drying food. But, I hope this post makes understanding the basics of dehydrating, including food safety, easier. Certainly making your own dehydrating food can take time but I enjoy cooking and learning about food science, so it was enjoyable for me. As this is not the case for everyone, luckily there are some amazing dehydrated and freeze dried food companies out there. Explore your options and remember to taste test!

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Comments 3

  • A Renee : Oct 16th

    Great info! Thanks for sharing!!

    • bill : Jan 13th

      On the other hand, olive oil unlike butter has zero cholesterol.


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