How to keep ice cream frozen on the way home
To keep ice cream frozen on the way home, buy it last, pack it tightly in an insulated bag or chilly bin with frozen ice packs, keep it out of the sun, and get it into the freezer as soon as you arrive. For trips longer than a couple of hours, dry ice is the most effective option, but it must be handled carefully. The less time ice cream spends warm, the creamier it stays.
Why it matters
Ice cream doesn't have to melt completely to be damaged. When the outside softens and then refreezes, small ice crystals grow into bigger ones and the texture turns grainy. A tub that softens on a warm drive home and then goes back in the freezer will never be quite as smooth. Our guide to storing ice cream at home explains the science.
Short trips: shop to home
For a trip of up to about 30 minutes, an insulated shopping bag is enough. A few habits make a big difference:
- Pick up ice cream and frozen food at the end of your shop.
- Pack frozen items together in the same bag; they keep each other cold.
- Put the bag in the cabin with the air conditioning, not a hot boot.
- Go straight home and unpack the frozen bag first.
Longer trips: picnics, baches and parties
For an hour or more, use a chilly bin. A good chilly bin with enough ice packs keeps ice cream firm for a few hours, depending on the weather and how often you open it.
- Pre-chill the bin by putting a few ice packs in it an hour before you pack.
- Freeze ice packs solid overnight. Frozen bottles of water work too.
- Layer: ice packs on the bottom, ice cream in the middle, more ice packs on top.
- Fill the gaps with a towel or crumpled newspaper; air is the enemy.
- Keep it shaded and keep the lid closed.
How long will it last?
| Method | Rough time ice cream stays firm | Notes |
|---|---|---|
| Plain shopping bag | Minutes on a warm day | Fine only for very short trips |
| Insulated bag, frozen items together | Up to about 30–45 minutes | Add an ice pack for longer |
| Chilly bin with ice packs | A few hours | Pre-chill and fill gaps |
| Chilly bin with dry ice | Much longer, often most of a day | Follow the safety rules below |
Times vary a lot with outside temperature, sun and how full the bin is. Treat these as rough guides and check the ice cream as you go.
Using dry ice safely
Dry ice is frozen carbon dioxide, and it is extremely cold: about -78.5°C, according to Cornell University's dry ice safety guidance. It keeps ice cream rock-solid, but it can burn skin and it gives off carbon dioxide gas as it turns from solid to gas. Follow these rules every time:
- Never touch it with bare hands. Use insulated gloves or tongs.
- Never seal it in an airtight container. The gas builds up pressure. A chilly bin with a loose lid is fine.
- Ventilate. Don't carry dry ice in the passenger area of a car if you can avoid it; keep fresh air flowing and the trip short.
- Keep it away from children and pets, and never eat it or put it in drinks.
- Don't put dry ice in your freezer. Let leftovers turn to gas outdoors or in a well-ventilated spot.
When we delivered ice cream in Wellington in past seasons, boxes travelled with a small amount of dry ice, with exactly these warnings.
Packing checklist
Before a long trip, run through this list so nothing gets forgotten:
- Chilly bin, washed and pre-chilled.
- Ice packs or frozen water bottles, frozen solid overnight.
- A towel or newspaper to fill gaps and insulate the top.
- Insulated gloves and tongs, if you're using dry ice.
- A scoop, cups and spoons for when you arrive.
- Baking paper to press onto any opened tubs before they go back in the cold.
- Space cleared in the freezer at your destination.
On the day, pack the chilly bin last, just before you leave, and keep it in the coolest part of the car out of direct sun. At the destination, move the ice cream into a freezer straight away rather than leaving the bin open on the deck while everyone unpacks.
If your ice cream softens anyway
Don't panic. If it is soft but still cold, put it straight into the coldest part of the freezer, press a sheet of baking paper onto the surface, and leave it overnight before serving. If it has completely melted, don't refreeze it; use it that day as a sauce over fruit or in a milkshake, or throw it out if it was warm for long.
Planning ahead for events
Taking ice cream to a party or work do? Clear space in the destination freezer, transport it in a chilly bin, and serve one tub at a time. Ice cream sandwiches travel especially well. Our guides on how much ice cream you need for a party and office ice cream parties cover the rest, and our where to buy page helps you find a tub close to home.
Frequently asked questions
How long will ice cream last in a chilly bin?
In a good chilly bin packed with frozen ice packs and kept out of the sun, ice cream usually stays firm for a few hours. Fill gaps so there's little air, open the lid as rarely as possible, and pre-chill the bin. With dry ice it can stay frozen considerably longer.
Is it safe to transport dry ice in my car?
Dry ice turns into carbon dioxide gas, which can build up in an enclosed space. Keep it in a vented container, never airtight, put it in the boot rather than the passenger area if possible, keep windows slightly open or ventilation on, and keep the trip short. Never leave children alone with it.
Can I refreeze ice cream that softened on the way home?
If it is still cold and only soft around the edges, put it straight in the freezer and it will be fine, though the texture may be slightly icier. If it has fully melted or sat warm for a long time, it is better not to refreeze it.
