How Long Does Dry Ice Last? A Complete Guide for Australians

Whether you’re shipping perishables across Australia, keeping food frozen during a camping trip, or transporting pharmaceuticals, dry ice is one of the most effective cooling solutions available. But one of the most common questions we hear at Envirofreeze is: how long does dry ice actually last?

The answer depends on several factors — storage conditions, quantity, and the container you’re using. In this guide, we break it all down so you can plan your cold chain with confidence.

How Long Does Dry Ice Usually Last?

Dry ice (solid carbon dioxide) sublimates — meaning it turns directly from a solid into a gas — at a rate of roughly 5–10% of its weight per hour under normal conditions. In practical terms:

• In an insulated esky or cooler: Dry ice will last approximately 18–24 hours for every 2–3 kg used, depending on how well-insulated the container is.
• In a styrofoam box: Expect around 18–36 hours per 2 kg block.
• In open air: Dry ice may only last 3–5 hours before fully sublimating.

The better the insulation, the slower the sublimation rate — and the longer your dry ice will last.

How Much Dry Ice Do You Need for 2 Days?

If you need to keep items cold for 48 hours, a general rule of thumb is to use 5–7 kg of dry ice per 24-hour period in a well-insulated container. For a full two-day trip or shipment, plan for 10–15 kg, though this will vary based on:

• The size and quality of your cooler or shipping box
• Ambient temperature (Australia’s summers can accelerate sublimation)
• How often the container is opened
• The mass of items being kept cold

For multi-day shipments of frozen food, pharmaceuticals, or seafood, Envirofreeze dry ice packs are an excellent cost-effective alternative — they’re compact, easy to store, and don’t sublimate the way solid dry ice does.

Will Dry Ice Last in a Regular Freezer?

Technically, dry ice will last longer in a freezer than at room temperature, but it’s not ideal. Here’s why:

• Dry ice sublimates at −78.5°C. A standard household freezer runs at around −18°C — far warmer than dry ice’s sublimation point.
• This means dry ice will still sublimate inside your freezer, just slightly more slowly than at room temperature.
• The CO₂ gas released can build up inside a sealed freezer, potentially causing pressure issues or triggering the appliance to work harder.
• Most manufacturers do not recommend storing dry ice in household freezers.

If you need extended cold storage, consider using Envirofreeze’s dry ice packs as a safer, more practical alternative for home and commercial use.

Is It Safe to Put Dry Ice in the Refrigerator?

Placing dry ice directly inside a regular refrigerator is not recommended. The extremely low temperature of dry ice can damage the fridge’s thermostat, internal components, and even cause the fridge to shut off entirely.

Additionally, the CO₂ gas released during sublimation can displace oxygen in enclosed spaces, which is a safety concern — especially in small areas like kitchens without proper ventilation.

Better option: Use an insulated shipping box or esky specifically designed for cold chain use, and pair it with Envirofreeze dry ice packs for longer-lasting, safer cooling.

What Are the Disadvantages of Dry Ice?

While dry ice is incredibly effective for cold chain applications, it does come with some notable limitations:

• Short lifespan: It sublimates continuously and cannot be “paused.”
• Safety hazards: Direct skin contact causes cryogenic burns; CO₂ gas can accumulate in enclosed spaces.
• Transport restrictions: Airlines and some courier services restrict the amount of dry ice permitted per package.
• Requires special handling: Always use gloves and ensure ventilation.
• Can freeze items solid: It may over-freeze items that only need to be chilled.

For many cold chain applications, Envirofreeze dry ice packs solve most of these problems — they’re safe to handle, flexible, and won’t release CO₂ gas.

The “Penny in the Freezer” Trick — What Does It Have to Do With Dry Ice?

You may have heard the old trick of placing a penny (or a coin) on top of a frozen cup of water in your freezer before leaving home. If the coin has sunk to the bottom or middle when you return, it means your freezer lost power and then refroze — and your food may no longer be safe to eat.

This is relevant to dry ice users because dry ice is sometimes used in freezers or eskies during power outages or long-distance transport. If you’re relying on dry ice to maintain frozen storage, checking the container temperature regularly is important — rather than relying on indirect clues like the penny trick.

For reliable temperature monitoring during shipping, pair your Envirofreeze dry ice packs with a temperature logger for full cold chain traceability.

Can You Drink a Drink That Has Dry Ice in It?

This is a popular question, especially for events and Halloween parties where dry ice is used for its dramatic smoky effect. The short answer: yes, but with caution.

• Dry ice should never be swallowed — it can cause internal cryogenic burns and is extremely dangerous.
• You can use dry ice in a punch bowl or around a glass for visual effect, but always ensure the dry ice has fully sublimated before drinking.
• Never place dry ice directly into a drink that will be consumed immediately.
• Food-grade dry ice is required for any application near consumables.

The Envirofreeze Advantage: A Smarter Alternative to Dry Ice

At Envirofreeze, we’ve been serving Australian and New Zealand businesses since the 1990s with high-quality cold chain solutions. Our dry ice packs are a popular alternative to solid dry ice for food shipping, pharmaceutical transport, and first aid cryotherapy.

• ✅ Are safe to handle without special equipment
• ✅ Don’t release CO₂ gas
• ✅ Can be cut to size for first aid applications
• ✅ Are compact and cost-effective to freight
• ✅ Are made from food-grade materials
• ✅ Are available in bulk packs — 20, 100, 350, and 1400-pack options

Browse our range of dry ice packs →

Frequently Asked Questions

Summary: Key Takeaways

• Dry ice lasts 18–36 hours in a well-insulated container.
• Plan on 5–7 kg per 24 hours for continuous cold chain needs.
• Avoid storing dry ice in household freezers or refrigerators.
• Never consume food or drinks with solid dry ice still present.
• For safer, more practical cold chain solutions, explore Envirofreeze dry ice packs.

Have questions about which cold chain solution is right for you? Contact the Envirofreeze team — we’re here to help.