Cold temperatures can kill scabies mites, but not as quickly or reliably as most people assume. Freezing conditions (0°C / 32°F) kill most mites within about four hours, while cool temperatures actually help them survive longer than room temperature does. For practical decontamination, heat is faster and more dependable than cold.
How Scabies Mites Respond to Cold
Scabies mites are surprisingly well adapted to cool environments. Research on mite survival at different temperatures found that mites lived longest at 4°C (about 39°F, the temperature inside your refrigerator), surviving up to 13 days. At 18°C (64°F), no mites survived beyond 8 days, and at typical room temperature of 30°C (86°F), none lasted more than 6 days. In other words, mild cold doesn’t harm these mites at all. It actually extends their lifespan compared to warmer conditions.
True freezing is a different story. At 0°C (32°F), most mites died within four hours or less. That’s a meaningful drop-off, but it still requires sustained exposure. Simply placing items outside on a chilly 40°F day won’t do the job, because that temperature range is closer to the mites’ survival sweet spot than their kill zone.
Eggs Are Harder to Kill Than Adult Mites
Scabies eggs are more resilient to cold than adult mites. At low temperatures, eggs can remain viable off a host for up to 10 days. Cool, humid environments are particularly favorable for egg survival, with some research showing mites and eggs persisting up to 19 days under those conditions compared to just 1.5 days in typical indoor air. This means that even if cold exposure kills the adult mites, eggs may survive long enough to remain a reinfestation risk.
Why Heat Works Better
The CDC recommends heat as the primary method for decontaminating fabrics and household items. Temperatures above 50°C (122°F) for 10 minutes kill both mites and eggs with complete reliability. A standard hot wash cycle followed by a hot dryer cycle easily exceeds this threshold, making laundry the most practical way to decontaminate clothing, bedding, and towels.
Cold has no equivalent benchmark. There’s no official recommendation from the CDC or other health agencies for using freezing as a decontamination method for scabies. The guidelines focus on hot water, hot dryers, and sealed bag storage as the go-to options.
What to Do With Items You Can’t Wash
For things that can’t go through a washer and dryer, like stuffed animals, decorative pillows, or delicate fabrics, the recommended approach is sealing them in a closed plastic bag for at least 72 hours, and up to one week for extra certainty. Scabies mites generally don’t survive more than two to three days away from human skin under normal indoor conditions, so the bag method works by simply starving them out. No special temperature is needed.
This is often more practical than trying to freeze items. A home freezer typically runs around -18°C (0°F), which would likely kill mites faster than the 0°C tested in research, but you’d need enough freezer space for bulky items and would still want to leave them in for several days to account for egg survival. The sealed bag approach accomplishes the same goal without taking up freezer space.
The Bottom Line on Cold and Scabies
Freezing temperatures do kill scabies mites, but cool temperatures below room temperature actually help them thrive. If you’re trying to eliminate mites from your environment, hot washing and drying is the fastest, most proven method. For items that can’t be laundered, sealing them in a plastic bag for several days is simpler and more reliable than freezing. Routine deep cleaning of your home beyond laundering fabrics and vacuuming is unnecessary for typical (non-crusted) scabies cases.