Not reliably. USDA FSIS says home freezing cannot be relied on to destroy trichina, and the CDC says freezing may not kill all worms in wild game because some are freeze-resistant. Minnesota Extension says 30 days at minus 10 to 0°F kills them in pieces 6 inches thick or less. Thorough cooking is the sure step.
The three sources differ, and this guide shows them side by side without choosing one freezing time as a safe rule.
It makes no claim about deer or venison, because none of the pages we opened addresses them.
Does Freezing Kill Parasites in Wild Game Meat?
| Question | USDA FSIS | CDC | UMN Extension |
|---|---|---|---|
| Can home freezing destroy it? | Home freezing “cannot be relied upon” to destroy trichina | Pork: yes, 20 days at 5°F (under 6 inches thick). Wild game: “may not effectively kill all worms” | Pork or wild game: 30 days at -10 to 0°F, 6 inches or less, “will kill the trichinella parasite that may be present” |
| What is the sure step? | Thorough cooking | Cooking to a safe temperature | Not stated in the freezing sentence |
| Scope | General freezing guidance, not wild-game specific | Names bear, wild boar, wildcat, fox, wolf, seal and walrus | Jerky section |
Two of the three sources tell readers not to rely on freezing to eliminate trichinosis. The CDC’s 20-day figure at 5°F (-15°C) is for freezing pork only; for wild game it says freezing may not kill all worms.
Why Do the Sources Disagree?
FSIS says parasites such as trichina can be destroyed by sub-zero freezing temperatures, but only under “very strict government-supervised conditions,” and that home freezing cannot be relied upon. The CDC says freezing pork less than 6 inches thick for 20 days at 5°F (-15°C) will kill any worms, but that freezing wild game “may not effectively kill all worms because some worms that infect wild game are freeze-resistant.”
The University of Minnesota Extension gives a freezing time in its jerky section: cut pork or wild game into portions 6 inches or less thick and freeze at minus 10 to 0°F for at least 30 days. The pages differ, and we do not resolve it. The Minnesota figure is one source’s guidance for jerky preparation.
Which Wild Game Is Most at Risk?
The CDC lists undercooked pork or wild game, in particular bear, wild boar, wildcat, fox, wolf, seal or walrus.
Its list does not name deer, and none of the sources we opened says whether deer carry or do not carry Trichinella, so we make no claim either way.
The CDC says people get trichinellosis, or trichinosis, after eating raw or undercooked meat that contains the parasite.
What Actually Makes the Meat Safe?
Cooking. FSIS says thorough cooking destroys all parasites, and the CDC says the best way to prevent trichinellosis is to cook meat to safe temperatures, and its risk list includes wild game. The CDC also says curing (salting), drying, smoking or microwaving meat alone does not consistently kill the worms.
A food thermometer is how you check; our guide on how to calibrate a meat thermometer shows how to check yours.
For general food safety, the CDC lists four steps: clean, separate, cook and chill, and says to wash your hands with warm water and soap before preparing food and after handling raw meat.
- Cook the meat thoroughly (FSIS, CDC).
- Check it with a food thermometer; see our roundup of the best meat thermometers for sausage and jerky.
- Do not treat curing, drying or smoking alone as a kill step (CDC); our deer jerky in a dehydrator guide covers its heat step.
- Clean the grinder thoroughly after each use (CDC); see how to clean a meat grinder and how to grind venison.
SAFETY: The CDC says freezing wild game meat may not kill all worms, and curing, drying, smoking or microwaving alone does not consistently kill them. USDA FSIS says home freezing cannot be relied upon to destroy trichina and that thorough cooking destroys all parasites. Use a food thermometer.
Should You Feed Raw Scraps to Animals?
No. The CDC says not to feed uncooked meat or scraps to animals. To help prevent Trichinella infection in animals, it also says not to allow pigs to eat uncooked meat, scraps or carcasses of any animals, including rats.
Does Freezing Do Anything for Safety?
Freezing to 0°F inactivates microbes, but FSIS says they can become active again once the food thaws, so handle thawed meat like any perishable food.
The CDC’s 20 days at 5°F (-15°C) is for pork less than 6 inches thick; for wild game meat its page gives no freezing time.
Our freezing before grinding guide covers freezing for texture, which is a separate matter from parasites. See also how to label frozen meat.
What Happens if Someone Is Infected?
The CDC says trichinellosis is rare in the United States, with only about 15 confirmed cases per year, and that its symptoms can be mistaken for flu. Symptoms of trichinosis often start with nausea, diarrhea, tiredness, fever and abdominal discomfort. They can then progress to include headache, fever, chills, cough, swelling of the face and eyes, aching joints and muscle pain, itchy skin, diarrhea and constipation. If the infection is heavy, there can be trouble coordinating movements and heart and breathing problems, and severe cases can cause death.
The CDC also says trichinellosis does not spread from person to person. If you have symptoms and may have eaten raw or undercooked meat, it says to speak with your healthcare provider, who can test your blood to diagnose it. Prescription drugs are available, and treatment should begin as soon as possible.
Wild Game Parasites and Freezing: Quick Answers
Can I freeze venison for 30 days and eat it rare?
The sources do not support relying on freezing for that. USDA FSIS says home freezing cannot be relied upon to destroy trichina, and the CDC says some worms that infect wild game are freeze-resistant. The 30-day figure is Minnesota Extension’s guidance in its jerky section. Thorough cooking is the sure step.
Does freezing make jerky safe?
The sources do not support relying on freezing when preparing homemade jerky. The CDC says curing, drying, smoking or microwaving alone does not consistently kill the worms. Our deer jerky in a dehydrator guide covers its heat step.
Does smoking kill the worms?
The CDC says smoking meat alone does not consistently kill Trichinella worms, and microwaving meat alone does not either. Cook the meat thoroughly.
Is the Minnesota freezing time wrong?
It is one source’s guidance, written for jerky preparation, and it differs from the CDC and FSIS. Minnesota Extension says 30 days at minus 10 to 0°F in pieces 6 inches or thinner will kill trichinella; FSIS says home freezing cannot be relied on and the CDC says wild-game worms may be freeze-resistant.
