How Long Does Dry Ice Last?

Dry ice usually lasts 18 to 24 hours when stored in a regular insulated cooler. Its shelf life depends mainly on how it is stored and the size of the dry ice block. Dry ice sublimates, meaning it changes directly from solid to gas, at a rate of about 5 to 10 pounds every 24 hours.

In a larger, well-insulated container with multiple blocks, dry ice can last up to 3 to 4 days. Outside or in less insulated containers, it lasts much shorter—only a few hours.

To maximize how long dry ice lasts, store it in a cooler with good insulation, keep the lid closed, and avoid airtight containers to reduce pressure buildup. The colder and drier the environment, the slower it sublimates. Dry ice will never melt into liquid; it always changes directly to gas at -109.3°F (-78.5°C).