Jerky Food Safety: Drying Is Not a Kill Step
Home dehydrating is mostly forgiving. Jerky is the exception, and the reason is a single fact that a lot of recipes skip: drying is not a pathogen kill step.
This is general guidance for home food preservation, not a regulatory standard. Your national food-safety authority publishes current guidance on home-dried meat, and where it differs from anything here, follow it.
Why drying alone is not enough
A dehydrator is drying meat, not cooking it. The surface temperature of the strips lags the air temperature, evaporative cooling keeps them cooler still, and the meat spends hours in a range where bacteria can survive. USDA FSIS: “After drying, bacteria become much more heat resistant.”
Worse, bacteria become more heat-resistant as they dry out. So a batch that reaches a given temperature at the end of drying has not received the same treatment as one heated while still moist — the drying itself has made the organisms harder to kill.
The organisms that matter here are the ordinary ones: Salmonella and E. coli O157:H7 in particular, both of which have been associated with home-dried meat.
The heat step
Food-safety guidance addresses this with an explicit heating step. USDA FSIS: “The U.S. Department of Agriculture (USDA) Meat and Poultry Hotline's current recommendation for making jerky safely is to heat meat to 160°F and poultry to 165°F before the dehydrating process.” and “Steam or roast meat to 160°F and poultry to 165°F, as measured with a food thermometer, before dehydrating it.”
There are two common ways to do it:
- Before drying — bring the strips to temperature in the marinade (a simmer) or in the oven, then transfer to the dehydrator to finish. Heating while the meat is still moist is the more effective order.
- After drying — a short oven step at the end. Workable, and it has to overcome the increased heat resistance the drying has produced.
After the heat step, FSIS’s next line is “Dry meats in a food dehydrator that has an adjustable temperature dial and will maintain a temperature of at least 130°F to 140°F throughout the drying process.” That dehydrator temperature dries the meat; it is not doing the first job, which is why the temperature guide on this site gives no dehydrator setting for meat at all.
Poultry has its own figure, 165°F, and this site gives no drying time for meat, poultry or fish: follow a tested recipe exactly, such as the one from the National Center for Home Food Preservation, which dries “until a test piece cracks but does not break when it is bent.”
Curing salt: what it is not
A curing salt (sodium nitrite) is an ingredient some tested jerky recipes use.
What it is not is a substitute for the heat step. FSIS’s recommendation is heat first, whatever else the recipe adds.
If a tested recipe calls for a curing salt, use exactly what that recipe and the cure manufacturer’s own label direct, for that product. Curing salts differ in strength, so an amount worked out for one is wrong for another; never round up and never substitute. This site does not calculate curing-salt amounts.
More is not safer. Curing salt is toxic in excess. Poison Control: “People who swallow larger amounts of these products may develop a potentially life-threatening condition called methemoglobinemia.” Many curing salts are dyed pink so they are not mistaken for table salt; keep yours labeled and away from children (Poison Control: “Keep medications and household chemicals in their original containers and out of reach and sight of children.”).
Water activity is about drying, not salting
A point worth being careful about, because the arithmetic invites a wrong conclusion.
Run a realistic marinade through the water activity estimator, say 100 g of water with 5 g of salt and 20 g of sugar, and you get an estimated aw of about 0.96. FDA: “Most foods have a water activity above 0.95 and that will provide sufficient moisture to support the growth of bacteria, yeasts, and mold.”
That number describes a liquid, not the finished jerky, and it is not a safety test of either. An estimate is not a safety test. Whether a food is shelf stable is decided by a tested process and a water activity measured with an instrument on the finished food, never by a calculation. For jerky, the safety step is the heat step above.
Storage
Moisture and warmth are the failure modes in storage. Store jerky airtight, keep it cool and dark, and condition a batch for a few days, jarred and shaken daily, so you can see condensation if some pieces were under-dried. National Center for Home Food Preservation: “Moldy foods should be discarded.”
Vacuum-sealing extends life and does not sterilise. For low-acid dried foods, an oxygen-free environment is exactly the condition C. botulinum prefers, so vacuum-sealed low-acid products that are not properly dried or otherwise stabilised are stored refrigerated or frozen rather than at room temperature.
Discard anything showing mould, an off smell, or condensation inside the packaging. A batch that never dried properly is not rescued by more storage.
The short version
- Drying is not a kill step. Heat to 160°F (beef) or 165°F (poultry), ideally before drying.
- A curing salt is not a replacement for heat; use one only exactly as a tested recipe and its label direct.
- Curing salt is toxic in excess and is kept away from children.
- A water activity estimate is not a safety test.
- Store airtight, cool and dark; condition the batch; discard anything doubtful.
Read USDA FSIS’s page and the National Center for Home Food Preservation’s tested recipe before a first batch. The calculators here do arithmetic; they cannot assess a batch of meat.