How to Store Dry Ice Safely and Keep It Longer

Dry ice is solid carbon dioxide. It does not melt into a liquid under ordinary conditions; it changes directly into gas, a process called sublimation. Correct storage slows that loss and helps prevent cold burns, pressure buildup, and dangerous carbon dioxide accumulation. Before bringing dry ice home, make sure you have a suitable container, a ventilated place to keep it, and a plan for using or safely disposing of what remains.

What You’ll Need

An insulated container: A foam cooler or a well-insulated cooler can slow sublimation. It must not seal airtight; do not use a container that locks or clamps down without a way for gas to escape.
Protective gloves: Use insulated, loose-fitting gloves designed for handling very cold materials. Ordinary thin kitchen or disposable gloves do not provide reliable protection from direct contact.
Tongs or a scoop: Use these to move pieces when practical, rather than picking them up by hand.
Ventilated storage space: Choose a cool, dry area with good air movement, away from people, pets, and confined spaces.
Eye protection: Safety glasses are sensible when transferring or breaking pieces, since chips can fly.

Step-by-Step

Plan the amount and timing. Buy dry ice as close as practical to when you need it. It continually sublimates, even in a cooler, so there is no way to keep it indefinitely. Ask the supplier about its packaging and handling directions, and avoid buying more than your use requires.
Choose a safe place first. Set the container in a well-ventilated location, such as a suitable outdoor area protected from weather, or a large room with effective ventilation. Keep it out of small enclosed rooms, closets, basements, cars, and other spaces where gas could build up. Carbon dioxide is colorless and odorless, so you cannot rely on sight or smell to detect it.
Prepare the container. Put the dry ice in an insulated cooler or similar container, preferably in its original packaging if that packaging is suitable. Do not put it in a freezer or refrigerator as a substitute for a cooler. A household freezer is not designed to store dry ice, and the gas can build up inside a closed appliance.
Keep the lid loose or vented. Rest the lid on top without fastening it, or use a container designed to vent gas. Never store dry ice in an airtight cooler, bottle, jar, or other sealed vessel. Sublimating gas can create dangerous pressure and rupture a container. Do not tape over vents or tightly wrap the cooler.
Handle pieces carefully. Put on insulated gloves and eye protection before opening or arranging the dry ice. Use tongs or a scoop if possible. Never touch dry ice with bare skin, and do not put it in your mouth. Its extreme cold can injure skin quickly, much like a burn.
Limit unnecessary opening. Open the container only when you need to remove or check the dry ice. Close the lid loosely again so the insulation can slow warming while gas still escapes. Keep the container away from direct sunlight and heat, but do not put it somewhere unventilated to keep it colder.
Keep people and pets away. Place the container where children and animals cannot reach it, and do not allow anyone to lean over it or play with the pieces. Never put dry ice in a drink or serve it in food; a piece that has not fully sublimated can cause severe cold injury if swallowed or touched.
Transport with ventilation. If you must carry dry ice in a vehicle, keep it in a vented, insulated container and ensure the passenger area has fresh-air ventilation. Avoid leaving it in a parked, closed vehicle. If safe ventilation is not possible, do not transport it in the passenger compartment.
Dispose of leftovers safely. Let unused dry ice sublimate in its vented container in a secure, well-ventilated place, away from people, pets, and children. Do not put it in a sink, toilet, trash can, or sealed container, and do not pour water over it. Do not leave it where someone could mistake it for ordinary ice.

Common Mistakes

Sealing the container: A tight lid may seem like a way to preserve the ice, but gas needs an escape route. Pressure can build until the container fails violently.
Storing it in a refrigerator or freezer: These appliances do not stop sublimation and may not safely vent the gas. Use an insulated cooler in a ventilated location instead.
Keeping it in a small room or car: Carbon dioxide can displace oxygen and accumulate without warning. Never treat an enclosed space as safe just because the quantity seems small.
Handling it with bare hands or thin gloves: Brief contact can still injure skin. Use suitable insulated gloves and tools; do not use wet gloves, which can freeze to the surface.
Assuming a cooler makes it safe: Insulation slows sublimation but does not stop it. A cooler still needs to vent, and the surrounding space still needs ventilation.
Putting it in drinks or food: Dry ice is not ready to consume, and remaining pieces can injure the mouth or throat. Keep it completely separate from anything being eaten or drunk.

Tips

Keep the cooler upright and stable, and place it where it cannot be knocked over.
Use the smallest practical opening and remove only what you need. The remaining pieces will last longer if they are not repeatedly exposed to warm air.
Follow the dry-ice supplier’s directions for the specific product and packaging. Do not transfer dry ice into an unfamiliar container unless you know it can vent safely.
Tell other household members where the container is and that it must not be opened, sealed, or handled without protection.
Do not put dry ice directly against food unless the supplier or the food’s handling instructions specify a safe arrangement. Keep food protected from direct contact and prevent packaging from becoming damaged by extreme cold.

Troubleshooting

The dry ice is disappearing faster than expected

Some loss is unavoidable, and the rate depends on the amount, piece size, insulation, and surrounding warmth. Keep the lid closed loosely, reduce unnecessary opening, move the container away from heat and sunlight, and use the dry ice sooner. Do not try to slow sublimation by sealing the container or putting it in a confined space.

The container is bulging, hissing, or difficult to open

Do not force it open, handle it, or stand over it. Move people away and get to fresh air. If it is safe to do so without approaching or touching the container, increase ventilation in the area; otherwise leave and contact local emergency services or the fire department for guidance. A sealed container may be under dangerous pressure.

Someone has touched or swallowed dry ice

For skin contact, move away from the source and seek prompt medical assistance, especially if the area is painful, numb, blistered, or discolored. If dry ice was swallowed or placed in the mouth, treat it as an emergency and contact emergency services or poison control immediately. Do not attempt to handle a swallowed piece or wait for symptoms to pass.

A person feels unwell near stored dry ice

Leave the area immediately and get to fresh air; do not re-enter to retrieve the container or help someone unless it is safe to do so. Call emergency services if anyone is confused, short of breath, faint, or otherwise seriously unwell. Carbon dioxide buildup cannot be judged by smell.

Frequently Asked Questions

How long does dry ice last in a cooler?

There is no fixed duration. It depends on how much you have, the size of the pieces, the cooler’s insulation, and how often it is opened. Expect ongoing loss and arrange to use it promptly.

Can I store dry ice in my freezer?

No. A household freezer is not an appropriate storage container because dry ice continues to release gas, and the appliance is not designed for that use. Choose a vented insulated cooler in a well-ventilated place.

Can I put dry ice in an airtight cooler?

No. Sublimation releases carbon dioxide gas, which can create dangerous pressure in a sealed container. Keep the lid loose or use a container specifically designed to vent.

Is it safe to keep dry ice in a car?

A closed passenger compartment can allow carbon dioxide to build up. Avoid leaving dry ice in a parked vehicle, and do not transport it in the passenger area without reliable fresh-air ventilation.

Can dry ice go down the sink or in the trash?

No. It can damage plumbing, create pressure in a closed bin, or expose someone to extreme cold. Let it sublimate in its vented container in a secure, well-ventilated place.

Can I touch dry ice with ordinary gloves?

Thin disposable or kitchen gloves may not protect you from its extreme cold. Use insulated gloves designed for cold handling, and use tongs or a scoop whenever practical.

Further reading: National Institute for Occupational Safety and Health. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.