Using Dry Ice for Camping: Tips for Keeping Food Cold

Quick answer

• Dry ice is a solid form of CO2, super cold (-109.3°F).
• It sublimates, turning directly into gas, no messy meltwater.
• Best for keeping coolers really cold for extended trips.
• Always handle with insulated gloves and good ventilation.
• Pack it strategically: bottom layer, then food, then regular ice.
• Don’t seal coolers airtight; let the CO2 gas escape.
• Monitor for ice sublimation; add more if needed.

What to check first (do this before you drive out)

Before you even think about hauling that super-cold block of CO2, let’s get the basics dialed in. This isn’t rocket science, but a little prep goes a long way.

• Land manager / legality: Who’s in charge of the land you’re heading to? Is it National Forest, BLM, a State Park, or private? Each has its own set of rules, especially regarding campfires and waste disposal. For dry ice, the main concern is ventilation in enclosed spaces and proper disposal of any leftover material. Always check the official page for the specific site/agency you plan to visit.

• Access/road conditions: This is huge. Dry ice is for when you’re going deep, right? So, what kind of rig are you rolling in? Is it a nimble 2WD that hates gravel, or a beast that can tackle washboard and mud? Know your vehicle’s limits and the route. A blown tire miles from anywhere is no fun, especially when your fridge is packed with dry ice.

• Fire restrictions + weather + wind: Dry ice is cold, but you still need to think about fire. Are campfires allowed? What about cooking? Check the current fire restrictions religiously. Weather is your friend or foe. Extreme heat means your dry ice will sublimate faster. High winds can be a nuisance, but also a good indicator for ventilation.

• Water plan + waste plan (Leave No Trace): Even with dry ice, you’ll likely have some regular ice that will melt. Plan for where that water goes. Pack it out if necessary, or use a designated grey water disposal area if available. Leftover dry ice needs to sublimate completely in a well-ventilated area. Don’t just dump it.

• Safety (wildlife, distance to help, comms): We’re out in the wild. Know what critters are around and how to store your food to keep them from visiting your campsite uninvited. How far are you from the nearest ranger station or town? Cell service is often a myth in the backcountry. Let someone know your itinerary and when to expect you back.

Step-by-step (field workflow)

Alright, you’ve done your homework. Now let’s get that dry ice into action.

1. Acquire Dry Ice:

• What to do: Buy your dry ice a day or two before your trip. It’s available from some grocery stores, welding supply shops, or specialized ice companies. Ask for it in block form if possible; it lasts longer.
• What “good” looks like: You have your dry ice, safely contained in an insulated box or a cooler you don’t plan to open much.
• Common mistake: Buying it the morning of your trip and not having enough time to properly pack it.
• How to avoid it: Plan ahead. Call around a few days in advance to reserve your amount.

2. Gather Safety Gear:

• What to do: Get thick, insulated gloves (like oven mitts or leather work gloves) and tongs.
• What “good” looks like: You can handle the dry ice without direct skin contact.
• Common mistake: Thinking you can just grab it with your bare hands for a second.
• How to avoid it: Treat it like it’s super hot – because it’s super cold. Always use protection.

3. Prepare Your Cooler:

• What to do: Use a good quality, well-insulated cooler. Consider a “dry ice specific” cooler if you plan to do this often.
• What “good” looks like: Your cooler is clean, dry, and ready to go.
• Common mistake: Using a flimsy cooler that leaks or doesn’t insulate well.
• How to avoid it: Invest in a solid cooler. It’s worth it for keeping your food safe and drinks cold.

4. Ventilate Your Vehicle:

• What to do: If transporting dry ice in a car, crack the windows. Never transport it in an unventilated passenger compartment.
• What “good” looks like: There’s a constant airflow in your vehicle.
• Common mistake: Stowing it in the trunk of a sealed car.
• How to avoid it: Carbon dioxide gas is heavier than air and can displace oxygen. Keep that air moving.

5. Layer the Dry Ice:

• What to do: Place a layer of cardboard or newspaper at the bottom of your cooler. Then, place the dry ice blocks on top of that.
• What “good” looks like: The dry ice isn’t directly touching the bottom of your cooler, which can sometimes damage insulation.
• Common mistake: Putting the dry ice directly on the cooler floor.
• How to avoid it: The cardboard acts as a buffer. Simple but effective.

6. Add Your Food and Regular Ice:

• What to do: Pack your food items around and on top of the dry ice. Fill any remaining space with regular ice.
• What “good” looks like: Your food is insulated by both dry ice and regular ice.
• Common mistake: Overpacking, leaving no room for air circulation.
• How to avoid it: Pack snugly, but don’t cram. Leave a little space.

7. Don’t Seal It Tight:

• What to do: Leave the cooler lid slightly ajar or use the drain plug slightly open.
• What “good” looks like: You can hear a faint hiss or see a wisp of vapor escaping.
• Common mistake: Sealing the cooler completely airtight.
• How to avoid it: Dry ice sublimates into CO2 gas. If it can’t escape, pressure builds up and can damage or burst the cooler.

8. Monitor and Replenish:

• What to do: Check your cooler periodically. As the dry ice sublimates, you’ll need to add more if you want to maintain extreme cold.
• What “good” looks like: Your food stays frozen or very cold throughout your trip.
• Common mistake: Assuming the initial amount will last the whole trip without checking.
• How to avoid it: Plan for replenishment if you have a long trip or expect hot weather.

9. Dispose of Leftovers Safely:

• What to do: Let any remaining dry ice sublimate completely in a well-ventilated area (outdoors, away from people and pets).
• What “good” looks like: No solid dry ice remains.
• Common mistake: Throwing leftover dry ice in the trash or down a drain.
• How to avoid it: Patience and ventilation are key. It will disappear on its own.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
<strong>Handling without gloves</strong>	Frostbite, severe skin damage	Always wear thick, insulated gloves.
<strong>Transporting in unventilated car</strong>	CO2 buildup, potential asphyxiation	Crack windows, ensure airflow during transport.
<strong>Sealing cooler airtight</strong>	Cooler rupture or explosion due to gas pressure	Leave lid slightly ajar or drain plug open.
<strong>Not using enough dry ice</strong>	Food spoils, lukewarm drinks	Estimate needs based on trip length and ambient temperature.
<strong>Using too much dry ice</strong>	Food freezes solid, potential damage to cooler	Pack strategically, not just cramming it in.
<strong>Putting dry ice directly on cooler floor</strong>	Can degrade cooler insulation over time	Use a layer of cardboard or newspaper as a buffer.
<strong>Dumping leftover dry ice</strong>	Safety hazard (frozen surfaces), potential damage	Allow it to sublimate completely in a well-ventilated outdoor area.
<strong>Mixing with food directly</strong>	Food can freeze solid, become brittle, or get damaged	Use regular ice as a buffer and pack food around dry ice.
<strong>Ignoring sublimation rate</strong>	Cooler warms up faster than expected, food spoils	Monitor and be prepared to add more dry ice if needed.
<strong>Using in a tent or enclosed space</strong>	CO2 buildup, risk of suffocation	Never use or store dry ice in confined, unventilated spaces.

Decision rules (simple if/then)

• If your trip is longer than 3 days, then you’ll likely need to plan for replenishing your dry ice supply because it sublimates continuously.
• If you’re traveling in extreme heat (above 85°F), then expect your dry ice to sublimate faster, so pack extra or a larger initial amount because the heat will accelerate the process.
• If you’re going car camping and have a good cooler, then dry ice is a solid option for keeping things truly frozen because it’s much colder than regular ice.
• If you’re backpacking or need to keep weight down, then dry ice is not a practical solution because it’s heavy and needs a robust cooler.
• If you’re concerned about CO2 buildup, then always ensure your transport vehicle and campsite have good ventilation because CO2 gas can displace oxygen.
• If you plan to use dry ice regularly, then investing in a cooler specifically designed for it might be worthwhile because they are built to handle extreme temperatures and sublimation.
• If you’re unsure about the amount of dry ice needed, then err on the side of slightly more because it’s better to have a little extra than to have your food spoil.
• If you have any doubts about the condition of your food after a trip with dry ice, then it’s best to err on the side of caution and discard it because food safety is paramount.
• If you’re camping in an area with strict regulations on what can be brought in or disposed of, then check those rules first before relying heavily on dry ice because disposal needs careful consideration.
• If you’re using dry ice for the first time, then start with a shorter trip to get a feel for how quickly it sublimates and how much you actually need because experience is the best teacher.

FAQ

What exactly is dry ice?

Dry ice is the solid form of carbon dioxide (CO2). It’s incredibly cold, sitting at -109.3°F (-78.5°C).

Why use dry ice instead of regular ice?

Dry ice keeps things much colder for longer and turns directly into gas, leaving no meltwater mess. It’s ideal for keeping items frozen, not just chilled.

How much dry ice do I need?

It depends on the size of your cooler, the ambient temperature, and how long you need things to stay frozen. A general rule of thumb is 5-10 pounds for a 24-hour period in a 50-quart cooler.

Can I store dry ice in a Styrofoam cooler?

Yes, Styrofoam coolers are excellent for dry ice because they are highly insulating and allow for sublimation. Just remember to vent it.

What happens if I seal a cooler with dry ice completely?

Pressure from the sublimating CO2 gas will build up, potentially causing the cooler to rupture or even explode. Always vent.

Is it safe to have dry ice in my car?

Yes, as long as the car is well-ventilated. Keep windows cracked to allow the CO2 gas to escape and fresh air to enter.

Can dry ice make food too cold?

Yes, it can. Items like produce can get damaged if they freeze solid. Pack them with regular ice or place them strategically away from direct contact.

How do I dispose of leftover dry ice?

Leave any remaining dry ice in a well-ventilated area, like outdoors, and let it sublimate completely. Never put it in a trash can or down a drain.

What this page does NOT cover (and where to go next)

• Specific purchasing locations for dry ice in every region. (Check local suppliers.)
• Detailed chemical reactions of CO2 sublimation. (Consult science resources.)
• Advanced cooler modification techniques. (Look for DIY forums.)
• Legal regulations on transporting large quantities of dry ice. (Review DOT guidelines.)
• Alternatives for very long-term food preservation in the backcountry. (Explore freeze-dried options.)