Does Freezing Kill Bed Bugs? Dry Ice, Cryonite and Freezers

Cold kills bed bugs, but only with the right combination of temperature and time. A University of Minnesota-led study found that every life stage dies after 80 hours at 3°F (-16°C). Bugs kept above 10°F (-12°C) can survive a full week. A home freezer at 0°F works on bagged belongings over 4 days. Cryonite CO2 snow and dry ice kill what they touch. None of them reach the wall voids where an infestation lives.

How cold does it have to be to kill bed bugs?

Below about 5°F (-15°C), held for days rather than minutes. The figures come from a 2013 Journal of Economic Entomology study led by University of Minnesota entomologists. They measured each life stage's freezing point, ran short exposures at nine temperatures, and modeled 21 combinations of temperature and time up to a week.

Bed bugs die once their body fluids freeze, at about -21°C to -30°C (-6°F to -22°F). Eggs freeze last.
Above that point, time decides: 100 percent mortality took 80 hours at -16°C (3°F), 3.5 days below -15°C (5°F), and 48 hours below -20°C (-4°F).
Above -12°C (10°F), the model predicted survivors after a full week.
Eggs survived brief exposures as cold as -25°C (-13°F), and bugs that survived a sublethal chill still fed a week later.

UC IPM's Pest Note, updated the same year, still lists chilling to 32°F or lower for several days. The Minnesota model predicts survivors at that temperature after a week, so treat 0°F (-17.8°C) as the floor.

How do you freeze bed bugs in a home freezer?

Seal items in plastic bags, hold them at 0°F (-18°C) or colder, and count 4 days from the moment the center of the item reaches 0°F. That is the University of Minnesota Extension rule, and it rounds up the study's 3.5-day minimum.

Check with a thermometer. Standard freezers are set to 0°F or lower, but older units may not hold it; Extension suggests a remote thermometer inside the bag.
Bag everything. The bag keeps bugs from escaping into the freezer and protects the item from condensation.
Expect bulky items to lag. Insulated items take one to three extra hours to reach lethal temperature in the middle.
Start the 4-day clock when the center hits 0°F. If the freezer averages below -4°F (-20°C), 48 hours is enough.
Watch for auto-defrost swings. The study's three kitchen freezers averaged 5°F to 7°F but swung between roughly 26°F and -11°F. They still killed every bug within 24 hours, but the authors base their advice on the controlled model.

Freeze shoes, books, pictures, toys, jewelry and cloth items you cannot launder. Keep out LCD electronics, valuable old books, irreplaceable items and anything holding liquid. Clothing and bedding go in the dryer, 30 minutes on high heat; the bed bug prep checklist has the full list.

What are Cryonite and dry ice treatments, and do they work?

Both rely on carbon dioxide at about -108°F (-78°C), and both kill only what they touch. Cryonite is the trade name of a system that blows pressurized CO2 snow onto baseboards, bedding, box springs, furniture and the cracks where bed bugs gather. Virginia Tech's non-chemical management guide says the snow freezes the bugs' cells and kills them instantly. It also states the limit: the process will not eliminate an infestation on its own. It is a spot tool, not a cure.

Dry ice is solid CO2, and at home it usually means bag fumigation. Rutgers researchers filled 42-gallon heavy-duty trash bags to 90 percent with clothing, pillows and boxes. They spread 1,350 grams, about 3 pounds, of dry ice pellets through the pile and tied the bags shut for 24 hours at room temperature. Every egg, nymph and adult died; the bags held CO2 at 94 percent or higher for at least 24 hours. With 900 grams, bugs near the top of one bag survived.

Is dry ice safe to use at home?

Only with gloves and ventilation, never in a closed bedroom or car. NIOSH lists frostbite from dry ice, and CO2 is about 1.5 times as dense as air, so it settles low in a room. NIOSH caps exposure at 5,000 parts per million over a work shift and 30,000 ppm for short periods. At 40,000 ppm the gas is immediately dangerous to life or health. Early symptoms are headache, dizziness and trouble breathing.

The Rutgers paper adds the field risks: CO2 spikes when dry ice goes into the bags and again when they are opened. Opening many bags in a small room risks asphyxiation, and so does dry ice in a closed car. The fixes are gloves, open windows, a ventilated vehicle and training.

What can freezing not do?

It cannot treat the room, and the room is where the infestation lives. UC IPM notes that common hiding places sit within 6 feet of where people sleep, in cracks as narrow as a credit card. The Rutgers fumigation authors rule out CO2 as a whole-house treatment, because a room cannot hold a lethal concentration long enough.

What cold will miss:

Wall voids under baseboards, where UC IPM points to insecticide dusts instead.
Eggs glued inside a crack. UC IPM says they hatch in about 10 to 15 days at room temperature.
Anything that arrives later. Cold leaves no residue, so a neighbor's unit or a suitcase back from a trip restarts the clock.

Heat covers a whole room, which cold cannot, but it leaves no residue either. UC IPM cites 140°F for two hours or 130°F for three hours, with 113°F as the minimum lethal temperature.

How does PesPro treat bed bugs instead?

With a combination of chemical and fungal treatments, targeted applications and a thorough inspection. PesPro's bed bug treatment targets all life stages, eggs, nymphs and adults, in the places a freezer or a snow wand cannot cover. The written quote is free, and the plan is priced after the inspection because severity sets the scope.

Property preparation is required before treatment, and PesPro provides a detailed checklist; freezing fits that stage for small unwashable items. Follow-up visits are part of the quoted plan and priced in it, not free, because eggs can hatch after the first treatment. The 30-day guarantee adds a third visit at no extra cost if bed bugs reappear within 30 days.

For apartment buildings, PesPro runs unit-by-unit protocols with documentation; the LA apartments post covers what California law requires. PesPro is QualityPro certified, holds California Structural Pest Control Board license PR-6378, and serves Los Angeles and San Bernardino counties from El Monte. Same-day service costs an extra fee and depends on the route. Check the service areas page, call (323) 472-5329, or request a free written quote.

Frequently asked questions

How long do bed bugs need to stay in a freezer?

At least 4 days at 0°F (-18°C), counted from when the center of the bagged item reaches that temperature. The research minimum is 3.5 days at 0°F, or 48 hours if the freezer averages below -4°F (-20°C). Verify with a thermometer, because older freezers may not hold 0°F, and warmer settings can let eggs and small nymphs survive.

Can I kill bed bugs by leaving things outside or in a cold garage?

No. University of Minnesota Extension says outdoor cold is unlikely to be cold enough for long enough, even there, because sun, humidity and daily swings let bugs survive. Southern California is far warmer, and the study predicted survivors after a week above 10°F (-12°C). Use a freezer that holds 0°F, or a dryer on high for 30 minutes.

How are bed bug follow-up visits priced at PesPro?

They are part of the quoted plan and priced in it, not free, because eggs can hatch after the first treatment. The written quote is free; the plan is priced after an inspection, since severity sets the scope. If bed bugs reappear within 30 days, the 30-day guarantee covers a third visit at no extra cost.