Start here · Process
The complete batch workflow.
Prep, cycle, dryness check, absorber, seal, label, log: what each stage is documented on, and where the published record stops.
Read the guideGuides
Find the next step for your freeze-drying project.
Practical, source-cited guidance for choosing a machine, running a batch and evaluating a small food business.
- Packaging and storage
How long freeze-dried food lasts.
Manufacturers publish up to 25 years; extension services recommend 5 to 10 for home machines. The figures side by side, and the four causes that shorten them.
- Camping
Which freeze-dried foods survive a backpack.
What breaks in a pack, what only looks broken — published fragility statements, the fat problem, and the puncture figures no maker publishes.
- Camping
Cold soaking freeze-dried meals: what the manufacturers say
Four of five backcountry brands take a position on cold water and one says nothing. Their published times run from 10 minutes to an hour, unreconciled.
- Machines
Can a freeze dryer replace a freezer?
Electricity prices are sourced; a freezer's kilowatt-hours are not. What a freeze-drying cycle actually costs, and which foods it can and cannot replace.
- Camping
Building a three-day trail menu from your own freeze dryer
Sourced calorie and weight bands, published rehydration figures where they exist, and a three-day menu that marks every calculated number as calculated.
- Camping
How much water your trail meals need
Manufacturers publish per-meal water volumes; extension publishes a method, not a ratio. What the sources say, where they disagree, and what is missing.
- Camping
What a week of homemade trail meals actually costs.
Commercial pouch prices from all five brand sites, one DIY dinner itemized to the cent, the seven-day gap, and what the DIY figure leaves out.
- getting started
Your first five batches, in order.
Five starter batches for a new home freeze dryer, ordered by how forgiving they are, with published thickness, loading, cycle and doneness guidance.
- Foods
Freeze-dried candy: what happens and what it needs.
What the vacuum does to candy, which types are documented to work, the published cycle figures, and why finished candy needs a desiccant, not an absorber.
- Machines
Freeze dryer maintenance you can plan for.
What home freeze dryer makers publish as a maintenance interval, what they publish as a fix, and the schedule data nobody publishes at all.
- Cultures
Freeze-drying kefir grains, sourdough starter, and cultures
What is documented about culture survival in freeze-drying — lab lyophilization figures, the one manufacturer claim, and the numbers nobody has published.
- Foods
Freeze-drying eggs.
Raw whisked is the documented method and the one extension advises against. Preparation, loading, endpoint, rehydration, storage, and what is unsourced.
- Dairy
Freeze-drying milk.
What the published record says about freeze-drying milk: the fat question, raw vs pasteurized, loading, rehydration ratios, and storage conditions.
- Machines
How loud is a freeze dryer?
Three of six home freeze dryer brands publish a decibel figure, from 52 to 78 dB, and none states how it was measured. What the published numbers describe.
- Foods
Mushrooms, herbs, and the small stuff.
What published sources actually say about freeze drying mushrooms and herbs: slice thickness, rehydration, liners, and where extension guidance stops.
- Packaging and storage
Six Things People Believe About Mylar and Absorbers That the Manufacturers Say Are Wrong
Six common mylar and oxygen absorber beliefs, each corrected in the manufacturers' own published words, with what to do instead.
- Packaging
Oxygen Absorbers: What the cc Number Means
cc is oxygen capacity, not food capacity. How to size by air volume, where the manufacturer charts disagree, and why vacuum sealing is not oxygen-free.
- Foods
Protein powder from freeze-dried food: what's documented.
Two manufacturer posts describe blending a shake and drying it. No extension source addresses protein powder at all. What that leaves documented.
- Selling
Where to find your state's cottage food authority.
The agency that runs cottage food law in each of the 50 states and DC, with a link to each and whether its published rules name freeze-drying. 23 of 51 do.
- Science
What water activity measures, and what it doesn't.
Water activity is available water, not total water. Where 0.85 comes from, what it governs, and what a single number cannot establish.
- Packaging
What bag thickness actually means
Mil is thickness. Barrier is OTR and WVTR. A sourced reference to what each figure measures, what every material publishes, and what nobody publishes.
- Machines
What it costs to run a freeze dryer.
Stay Fresh publishes 18.5 kWh per 24-hour cycle, $3.33 at 18¢/kWh. Why other brands' per-batch figures can't be checked, and the formula for your own rate.
- Selling
The economics of selling what you dry.
What a state's cottage food structure, its verification conditions and a fully labelled unit cost model actually do to the price of one bag.
- Machines
Which home freeze dryer should you buy?
A $1,700–$5,000 decision made on published specs: batch size, placement, circuit, pump and warranty for every home freeze dryer under $5,000 sold to US buyers.
Have a specific problem?
Start with the symptom if a batch, package or machine is not behaving as expected. The troubleshooting pages take one symptom at a time.
Find a troubleshooting guide