Quick Answer
Dry ice generally lasts 18–24 hours in a conventional cooler, but this can vary based on:
- Cooler quality (how thick the insulation is).
- Dry ice used (5–10 lbs per 24 hours is average)
- Outer temperature (heat speeds sublimation).
- How frequently the cooler is opened.
Preparing for a camping trip, shipping perishables, or gearing up for a power outage? Dry ice (solid CO₂) is an excellent cooling agent, but its limited longevity can be a challenge. If you’re asking “How long does dry ice last in a cooler? —this guide explains the science, has tips from pros on how to make it last and the essentials to know about its safety.
Factors That Determine How Long Dry Ice Lasts
Cooler Quality and Insulation
- Best: Heavy-duty rotomolded coolers (Yeti, RTIC) will keep dry ice frozen for 24–48 hours.
- Average: Regular styrofoam or plastic coolers last between 12–18 hours.
- TIP: Insulate the inside of your cooler with foam layers, towels, or clothes to limit air gaps.
Ambient Temperature
- Hot weather (90°F+): Dry ice sublimes 2–3x faster.
- Cool environments (60°F or below): Significantly reduces the rate of sublimation.
Dry Ice Quantity
- For dry ice, use 5–10 lbs per 24 hours depending on cooler size.
- For example, 10–15 lbs of ice will keep a 50-quart cooler cold for 24+ hours.
Frequency of Opening
- Each time you open the cooler, warm air enters, rapidly accelerating sublimation.
- Minimize gaps by packing items in order of need.
How to Make Dry Ice Last Longer in Your Cooler
Pre-Chill the Cooler:
- Pre-chill your cooler with regular ice or frozen gel packs for 1–2 hours before adding dry ice.
Package Dry Ice in Newspaper or Towels:
- One way to slow sublimation is to insulate the dry ice. Keep food off the direct contact to eliminate freezer burn.
Replace Pellets With Block Dry Ice:
- So it takes longer to sublimate a block compared to a cylinder of pellets due to the smaller surface area.
Store the Cooler in Shade:
- Store it somewhere cool and dry (your car trunk, not the backseat).
Layer Items Strategically:
- Put dry ice on top (because CO₂ sinks) to keep its contents cold longer.
Safety Tips When Using Dry Ice
- Use gloves: Direct exposure to dry ice results in frostbite to the skin.
- Vent Your Cooler: Don’t seal it airtight — CO₂ gas needs somewhere to go to prevent a pressure buildup.
- Avoid getting access to children/pets: Be sure coolers are stored safely and in a well-ventilated area.
Dry Ice vs. Regular Ice: Which Lasts Longer?
| Factor | Dry Ice | Regular Ice |
|---|---|---|
| Lifespan | 18–24 hours | 12–24 hours (melts to water) |
| Temperature | -109°F (-78°C) | 32°F (0°C) |
| Best For | Long trips, medical supplies | Short outings, drinks |
Common Mistakes to Avoid
- Using Too Little Dry Ice: Underestimating quantity leads to faster sublimation.
- Put Dry Ice on the Bottom: Cold air is heavier—put it on top for maximum cooling.
- Not Ventilating: Containers can explode from CO₂ buildup.
How to Dispose of Dry Ice Safely
- Allow unused dry ice to sublimate in a well-ventilated area (never discard in sinks or toilets).
- Yes, wear gloves when dealing with the remains.
Take Control of Your Cooler’s Cooling Power
So, for how long is dry ice effective in a cooler? If you’re prepared enough, you can make it last 24–48 hours. Insulate, open the cooler only when you have to and use dry ice in slabs for maximum performance. Whether you’re refrigerating vaccines or marinating steak for a barbecue, these pointers will help maximize every pound.
