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Should You Use Dry Ice to Save Refrigerated Food?

By Nora Callahan · August 5, 2026 · 17 min read

Editorial review note: This guidance prioritizes FDA, state public-health, and university-extension recommendations. Commercial supplier advice is identified as such and should remain subordinate to instructions from the appliance manufacturer and local emergency authorities.

The short answer: dry ice is possible, but only for limited emergency use

Yes—dry ice may temporarily cool a nonworking refrigerator during an extended power outage or appliance failure. However, authoritative guidance supports using dry ice to preserve already frozen food more strongly than using it to keep ordinary refrigerated food cold.

Start by identifying which situation applies:

The refrigerator or freezer is still powered and operating. Do not add dry ice routinely. Commercial supplier guidance warns that its extreme cold may interfere with thermostat operation. Appliance designs differ, so follow the instructions for your exact model or ask the manufacturer before considering dry ice in a running appliance.
The refrigerator is unpowered and contains chilled food. Dry ice is a possible short-term contingency, but it can rapidly freeze nearby food. A cooler with block or bagged ice is usually easier to control.
The freezer is unpowered and contains frozen food. Dry ice is better suited to this job because maintaining the frozen state is the objective.

The Washington State Department of Health recommends blocks or bags of ordinary ice for refrigerators and dry ice primarily for saving frozen food. It also warns against placing dry ice directly on food or glass shelves and against using it in an operating freezer (Washington State food-safety guidance).

Treat dry ice as temporary emergency cooling—not as a substitute for appliance repair, powered cold storage, or a sustainable plan for a multi-day outage. If dependable powered storage is available, transferring the food there is generally preferable.

Do not proceed with dry ice if:

The appliance is operating and its manufacturer has not approved such use.
The surrounding room cannot be adequately ventilated.
You cannot isolate the dry ice from food, shelves, liners, and other vulnerable materials.
Proper insulated gloves or suitable tongs are unavailable.
Children or pets could reach it.
The room must be used for sleeping.
You cannot monitor the appliance temperature during a prolonged outage.
Anyone develops rapid breathing, headache, blue lips or fingernails, or another concerning sign while dry ice is in use.

Commercial supplier guidance permits emergency use in a completely unpowered appliance but warns that dry ice continually releases carbon dioxide, can cause severe cold burns, and may crack glass, plastic, or Formica through direct contact (Greco Gas dry-ice safety guidance).

Before adding anything: use the outage clock and keep the doors closed

You probably do not need dry ice as soon as the power fails. Opening an appliance to inspect the food or install an emergency cooling source releases cold air and reduces its passive holding time.

As soon as the power goes out:

Record the outage start time. Use a phone note, paper label, or message to another household member.
Leave the refrigerator and freezer doors closed.
Check the utility’s outage estimate without opening the appliances.
Locate appliance thermometers, food thermometers, coolers, ice, and possible powered storage.
Make a transfer plan before opening either door.

An unopened refrigerator generally keeps food cold for about four hours. A closed, full freezer generally keeps food safely cold for approximately 48 hours, while a half-full freezer does so for approximately 24 hours. These are approximate food-safety windows, not promises that a freezer will remain at its normal 0°F operating temperature throughout the outage (Michigan State University Extension outage guidance).

For an outage expected to last no more than four hours, leaving the refrigerator closed is better supported than opening it to install dry ice. Prepare the next step, but do not sacrifice the cold air already inside.

For a longer outage, use this order of preference:

Transfer high-risk food to a working refrigerator or freezer, if that can be done safely.
Move refrigerated perishables to a cooler with block or bagged ice.
Consolidate frozen packages so they help insulate one another.
Use dry ice primarily for frozen food if powered storage is unavailable.
Consider dry ice in a nonworking refrigerator only when safer, more controllable options are impractical.

When cooler space is limited, prioritize meat, poultry, seafood, milk and other dairy products, eggs, leftovers, and cooked foods. Do not use scarce cold-storage space first for comparatively stable condiments or other less temperature-sensitive items.

An appliance thermometer is the most practical way to determine whether a refrigerator remains at or below 40°F and a freezer remains at or below 0°F. A separate food thermometer can help assess individual packages after power returns.

Approach	Best use	Main advantage	Main limitation	Key safety concern
Closed appliance only	A short outage within the appliance’s passive holding period	Requires no handling or supplies	Cooling declines as the outage continues	Unnecessary door openings shorten the holding period
Cooler with block or bagged ice	Refrigerated meat, dairy, eggs, leftovers, and cooked food	Less likely than dry ice to freeze food rapidly	Requires ice replacement and drainage management	Keep food at or below 40°F and prevent cross-contamination
Dry ice	Primarily preserving already frozen food	Provides extremely cold emergency cooling	Runtime varies, and refrigerated food may freeze	Cold burns, carbon-dioxide accumulation, pressure, and surface damage
Powered cold storage	Longer outages when another working appliance is accessible	Provides controlled, sustainable cooling	Safe transfer may be difficult or unavailable	Maintain the cold chain during transport

Plan the move before opening a door: prepare the cooler, position the ice, identify the food to remove, and make one quick transfer. Repeatedly checking whether food “still feels cold” wastes retained cooling and does not establish whether it is safe.

Why dry ice requires more caution than ordinary ice

Dry ice is solid carbon dioxide at approximately -109°F. Instead of melting into liquid water, it changes directly from a solid into gas through sublimation (Florida International University dry-ice guidelines). Those properties create hazards that ordinary water ice does not present to the same degree.

Severe cold injury

Dry ice can cause severe cold burns or frostbite. Never pick it up with bare hands. Use insulated cold-handling gloves or suitable tongs, and do not handle it if appropriate protection is unavailable.

Keep dry ice out of reach of children and pets. Do not leave it unattended where someone could mistake it for ordinary ice, and never taste it or put it in the mouth.

Carbon-dioxide accumulation

As dry ice sublimates, it continually releases carbon-dioxide gas. In a confined or poorly ventilated space, the gas can displace oxygen and create an asphyxiation hazard. Particular caution is necessary in small rooms, basements, vehicles, walk-in storage areas, and other low or enclosed locations.

Opening a refrigerator or freezer door does not substitute for adequately ventilating the surrounding room.

Michigan State University Extension identifies suffocation and severe breathing problems as possible consequences of accumulated carbon dioxide and requires proper ventilation wherever dry ice is stored (MSU Extension dry-ice safety guidance).

If anyone develops concerning signs such as rapid breathing, headache, or blue lips or fingernails, leave the affected area and seek appropriate emergency guidance.

Pressure buildup

Never put dry ice in an airtight cooler, jar, bottle, bag, or other sealed container. Sublimation continues after a container is closed. If gas cannot escape, pressure can rise until the container ruptures.

A cooler holding dry ice must also allow gas to escape; do not latch or seal it gas-tight.

Thermal and quality damage

Manufacturer instructions and the appliance’s materials still govern.

Dry ice should also be separated from every food package. The main concern is temperature control: food touching or sitting close to a -109°F material may freeze rapidly, suffer texture damage, or become difficult to use. This separation is not based on an unsupported claim that carbon dioxide chemically contaminates properly packaged food.

Dry-ice safety essentials

Provide good ventilation throughout use.

Wear insulated cold-handling gloves or use suitable tongs.

Prevent direct contact with skin, food, shelves, liners, and counters.

Never seal dry ice in an airtight container.

Keep it away from children and pets.

Stop using it if adequate ventilation, separation, or temperature monitoring cannot be maintained.

How to use dry ice in a nonworking refrigerator

This procedure is only for a refrigerator that is unpowered during an extended outage or breakdown. It is not a recommendation for routine dry-ice storage in a running appliance.

Check the appliance manual if it is available. Shelf materials, liners, sensors, air passages, and permitted emergency procedures differ among models.

Confirm that the refrigerator is off. If power could return unexpectedly, switch the appliance off using its normal control. Disconnect it only if doing so is safe and does not require entering a wet or damaged area. Do not interfere with damaged electrical equipment.
Ventilate the surrounding room. Provide good airflow to the outdoors where practical. Do not use dry ice in a room that must remain closed or be used for sleeping.
Put on insulated gloves. Use suitable tongs if necessary. Keep bare skin away from the dry ice.
Prepare a stable insulating barrier. Place sturdy cardboard, several layers of newspaper, or another suitable protective barrier over the supporting interior surface.
Isolate the dry ice from every food package. Leave clearance around fragile containers and foods that would be damaged by freezing.
Choose placement according to safe outcomes, not a universal shelf rule. The support must be stable, protected from thermal shock, clear of fragile materials, and arranged to reduce localized freezing.
Install an appliance thermometer. Position it where it can be read quickly with minimal door opening.
Close the door promptly. Do not reopen it merely to see how much dry ice remains.

Refrigerator-specific placement advice is inconsistent. Some commercial sources recommend low placement, while freezer guidance generally places dry ice above frozen food because cold air sinks. Arctic Dry Ice, for example, recommends bottom-shelf refrigerator placement but high freezer placement (Arctic Dry Ice outage guidance).

That disagreement is a reason not to declare either the top or bottom shelf universally correct. Refrigerator designs differ, and cold air sinking does not resolve the central problem: food near dry ice may freeze even if the appliance’s average temperature remains within the refrigerator range.

Focus on these outcomes:

The dry ice has stable support.
No dry ice touches a shelf, liner, drawer, food package, or fragile container.
A substantial insulating barrier limits thermal shock.
Refrigerated food does not freeze unintentionally.
Temperature can be checked without prolonged or repeated door opening.

Actual cooling performance depends on refrigerator capacity, insulation, door-seal condition, initial temperature, food load, empty air space, room temperature, dry-ice form, and the number and duration of door openings.

Move the food to a block-ice cooler instead if refrigerated items begin freezing, safe separation cannot be maintained, or the temperature cannot be monitored. The continued presence of dry ice does not prove that every package remained within a safe temperature range.

When utility power returns, do not simply restart the refrigerator with dry ice and temporary barriers still inside unless the manufacturer has approved that arrangement. Ventilate the room, remove the remaining dry ice with insulated gloves or suitable tongs, and place it in a secure, ventilated location. Remove temporary barriers and external blankets, check the appliance for visible damage, and restore operation according to the manufacturer’s instructions.

Freezer use is better supported—and follows different rules

Dry ice is better matched to an unpowered freezer because the objective is to keep food frozen. Localized freezing, which can damage ordinary refrigerated food, is not the same concern when packages are already frozen.

Use this separate freezer procedure:

Keep the freezer closed until the dry ice and setup materials are ready.
Ventilate the surrounding room.
Wear insulated gloves or use suitable tongs.
Consolidate frozen packages to reduce open air space and help them insulate one another.
Place sturdy cardboard or several layers of newspaper above the food.
Set the dry ice on top of that barrier, not directly on food or an appliance surface.
Close the freezer promptly.
Monitor temperature with as little door opening as possible.

University of Minnesota Extension recommends placing cardboard over the freezer contents and dry ice above it. Its guidance also emphasizes gloves and good room ventilation because accumulated carbon dioxide can cause loss of consciousness or asphyxiation (University of Minnesota Extension outage guidance).

Placement above the food takes advantage of cold air sinking, while the barrier helps prevent direct contact and localized damage. Do not let dry ice rest against the liner, shelving, food packages, or glass.

Quantity and runtime estimates differ substantially among sources because they do not describe identical appliances or conditions. Do not extrapolate a precise household runtime from a single example. Use the figures in the next section only for planning, then verify conditions with a thermometer and inspect frozen food for ice crystals when deciding what to keep.

If blankets are placed around an appliance for additional external insulation, do not cover appliance air vents. Remove the blankets before restoring operation and follow the manufacturer’s instructions.

How much dry ice and how long it lasts: use scenarios, not promises

There is no well-supported universal formula for the amount of dry ice required in a refrigerator. Ten, 20, or 25 pounds cannot be declared correct for every appliance or outage.

The strongest numerical guidance concerns full freezers of stated capacities. Refrigerator evidence is much thinner because its objective is more difficult: keeping food at or below 40°F without subjecting it to the extreme local temperature of dry ice.

Appliance type	Stated capacity and fullness	Cited quantity	Cited approximate duration	Evidence limitation	Monitoring requirement
Nonworking refrigerator	Capacity and fullness not standardized	10-pound slab	Roughly 12–24 hours	A narrow Florida International University emergency example, not a universal formula (FIU guidelines)	Use an appliance thermometer and watch for unintended freezing
Upright or chest freezer	Fully stocked, 18 cubic feet	50 pounds	About two days	FDA example applies only to the stated freezer scenario (FDA outage guidance)	Verify temperature and inspect food for ice crystals
Freezer	Full, 20 cubic feet	50 pounds	About four days	Extension estimate depends on closed-door and other stated conditions (University of Minnesota Extension)	Verify with a thermometer
Freezer	Volume-based estimate	About 2.5–3 pounds per cubic foot	No single runtime specified	General extension planning ratio, not a performance guarantee (MSU Extension safety guidance)	Verify temperature rather than inferring safety from quantity
Freezer	Full, 10 cubic feet	25 pounds	About two to four days	Applies to the stated freezer, not a refrigerator (Michigan State University Extension)	Confirm conditions with a thermometer

These estimates should not be averaged into a new household formula. Differences can result from:

Capacity: A larger interior generally requires more cooling.
Unused air space: Empty space behaves differently from already cold food mass.
Food mass: A full appliance usually holds temperature better than a nearly empty one.
Insulation: Appliance type, age, and construction matter.
Seal condition: Damaged or dirty door gaskets allow heat to enter.
Starting temperature: An appliance already warming when dry ice arrives has a greater cooling load.
Room temperature: A hot kitchen increases heat gain.
Door opening: Every opening introduces warmer room air.
Placement: Poor separation may freeze nearby food without cooling the appliance evenly.

Buying more dry ice is not automatically safer. It may also create the false impression that food is protected for a predictable period.

For a multi-day outage, prioritize transfer to reliable powered storage, a commercial cold-storage option where available, or another arrangement recommended by local authorities. Repeated dry-ice purchases should not become a substitute for dependable refrigeration.

Decide what food is safe by time and temperature

Cooling performance and food safety are separate questions. Dry ice remaining in an appliance does not prove that every package stayed cold enough. Neither does food that feels cold, looks normal, or has no unusual odor.

Use these temperature targets:

Refrigerator: 40°F or below
Freezer: 0°F or below during normal operation

The FDA says to discard refrigerated perishable food that has been above 40°F for four hours or more. This differs from the general room-temperature rule: perishable food held at room temperature should be discarded after two hours, or after one hour when outdoor temperatures exceed 90°F. Frozen food may generally be refrozen or cooked if it still contains ice crystals or measures 40°F or below, although partial thawing and refreezing can reduce quality (FDA food-safety guidance).

Use this post-outage decision process:

Identify the food category. Determine whether it is a refrigerated perishable, a comparatively stable refrigerated product, or frozen food.
Review elapsed time. Start with the outage clock and include any period the food spent in a cooler, vehicle, or room.
Check recorded appliance temperatures. Use thermometer readings where available.
Measure individual food when useful. A food thermometer provides better evidence than touching a package.
Inspect frozen food for ice crystals. Remaining ice crystals or a measured temperature at or below 40°F may support refreezing or cooking.
Keep, cook, refreeze, or discard according to the applicable rule.
Discard uncertain high-risk perishables when reliable time-and-temperature information is unavailable.

Never taste food to determine whether it is safe. Normal smell and appearance cannot reliably rule out harmful microbial growth. Cooking is also not a guaranteed remedy for food that has experienced unsafe temperature exposure.

When time or cooler space is limited, evaluate meat, poultry, seafood, dairy products, eggs, leftovers, and cooked foods first. Comparatively stable condiments should not distract from foods that depend on controlled refrigeration.

For a fuller item-by-item treatment, consult OutageGuide’s refrigerator food-safety article on the four-hour rule. Dry-ice quantity and runtime estimates should never replace a time-and-temperature assessment.

Handling leftover dry ice and knowing when to abandon the plan

Unused dry ice continues releasing carbon dioxide after it leaves the appliance. Allow it to sublimate in a secure, well-ventilated location where children and pets cannot reach it. Do not place it in an airtight container while waiting for it to disappear.

Maintain adequate ventilation throughout the process.

Stop the dry-ice setup if:

Ventilation becomes inadequate.
The room must be closed or used for sleeping.
Children or pets cannot be kept away.
Dry ice cannot be isolated from glass, plastic, liners, tile, counters, or food.
Refrigerated food is freezing unintentionally.
Appliance temperature cannot be monitored during a prolonged outage.
The dry ice is unstable or cannot be handled with proper protective equipment.
Anyone develops rapid breathing, headache, blue lips or fingernails, or another concerning sign.

If unsafe carbon-dioxide accumulation is suspected, leave the affected area and seek appropriate emergency guidance. Do not attempt to establish a safe exposure level yourself, and do not re-enter a confined area merely to retrieve food or dry ice.

If skin contacts dry ice, stop the exposure and avoid further bare-skin handling. Seek medical care if the skin blisters, peels, or otherwise appears seriously injured.

The practical decision rule is simple: leave the refrigerator closed during a short outage; move refrigerated perishables to powered storage or a block-ice cooler during a longer outage; and reserve dry ice mainly for an unpowered freezer or a carefully managed refrigerator emergency.

If dry ice is used, ventilation, insulated handling, protected surfaces, and thermometer readings are nonnegotiable. Keep or discard food according to measured time and temperature—not according to how much dry ice remains. During a declared emergency, instructions from local authorities and utility providers take priority over improvised household cooling plans.

Can I put dry ice in a refrigerator that is still running?

Not routinely. Greco Gas advises against using dry ice in a running refrigerator or freezer because the extreme cold may affect thermostat operation. That is supplier guidance rather than a universal government rule, so the instructions for the exact appliance model should govern.

If the refrigerator is still operating, keep its door closed and use its normal controls unless the manufacturer directs otherwise. Do not assume that permission for one appliance applies to another.

How much dry ice should I use in a nonworking refrigerator?

There is no universal amount. The limited refrigerator estimate in the scenario table is not capacity-adjusted and does not guarantee a particular runtime.

Refrigerator size, food load, insulation, seal condition, room temperature, starting temperature, dry-ice form, and door openings all affect performance. Use an appliance thermometer, protect food and surfaces, and choose a block-ice cooler instead if localized freezing cannot be prevented.

Should dry ice go on the top or bottom shelf?

There is no universally supported refrigerator position. Commercial refrigerator guidance conflicts, with some suppliers recommending low placement. For freezers, university-extension guidance is clearer: place cardboard or several layers of newspaper above the frozen food and put the dry ice on that barrier.

In a refrigerator, prioritize stable support, a substantial insulating barrier, clearance from food and fragile materials, unobstructed air passages, and temperature monitoring. Cold air sinking does not eliminate the risk that nearby refrigerated food will freeze.

Can carbon dioxide build up when dry ice is inside a refrigerator or freezer?

Yes. Dry ice continually sublimates into carbon-dioxide gas, which can accumulate in a poorly ventilated surrounding room or another confined space and displace oxygen. Closing the appliance door does not remove the need for adequate room ventilation.

Never use dry ice near a sleeping area, and never seal it in an airtight container. If anyone develops rapid breathing, headache, blue lips or fingernails, or another concerning sign, leave the area and obtain appropriate emergency help.

Can partially thawed freezer food be refrozen after an outage?

Generally, frozen food may be refrozen or cooked if it still contains ice crystals or measures 40°F or below. Refreezing may reduce quality, particularly texture, even when the food remains eligible for refreezing.

Do not decide by taste, smell, appearance, or the presence of leftover dry ice. If food has fully thawed and reliable time-and-temperature information is unavailable—especially for meat, poultry, seafood, cooked dishes, or other high-risk items—the safer choice is to discard it.