How to Freeze-Dry Things

by Kelly Morris

Freeze-dried food lasts a long, long time, which is why backpackers and those prepping for a doomsday disaster keep supplies of it. Freeze-dried cottage cheese, for example, keeps for at last 30 years unrefrigerated, according to the Mother Jones website. Freeze-dried foods last even longer than dehydrated foods, because the process removes more moisture. Camping supply stores sell freeze-dried food, but you may make your own. You can freeze-dry just about anything, including fruits, vegetables, dairy products, seafood and meat. Simply add water before eating.

Cut the food you want to freeze-dry into small pieces. Large pieces take longer to freeze dry.

Place the pieces of food in a single layer on a baking sheet. Space the pieces evenly and make sure they don’t touch each other.

Adjust the temperature in the freezer to the lowest setting. Put the baking sheet in your freezer and allow the food to freeze for a full week. Avoid opening the freezer door if you can during that time. If you plan to freeze-dry a lot of food, you might want to purchase a freezer to use for that purpose.

Remove a piece of food from the freezer after one week and allow it to thaw. If it appears black in color when it thaws, the food is not ready yet. Dispose of that piece of food and leave the rest in the freezer for two or three more days. Then take out another piece of food and let it thaw. The food is ready when it thaws without turning dark in color.

Put the freeze-dried food in freezer bags and use a vacuum sealer to seal the bags. If you do not have a vacuum sealer, press out as much air as possible before sealing the bags.

Store freeze-dried food at temperatures of 60 degrees Fahrenheit or lower.

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Items you will need

  • Knife
  • Freezer bags
  • Baking sheet
  • Freezer
  • Vacuum sealer, optional.


  • The Doomsday News website recommends freeze-drying fruits and vegetables first. Once you get the hang of that, move on to things like meat.
  • When sealing freezer bags without a vacuum sealer, use your mouth to remove any remaining air from the bags before sealing them. Seal the bag most of the way, leaving just a little opening for your mouth. Exhale first, then seal your mouth around the opening and suck out any remaining air in the bag. Make sure you don’t breathe into the bag during this process, because your breath contains moisture. Quickly seal the bag.

About the Author

Kelly Morris has been making a living as a writer since 2004. She attended the College of Mount St. Joseph with a major in social work and minor in women's studies. Her work has appeared in a number of print publications including Caregivers Home Companion, Midwifery Today and Guide.

Photo Credits

  • Creatas Images/Creatas/Getty Images