Block Ice vs. Cubes: Which Keeps Your Food Colder
Last verified: September 2026
Everything you need to know about choosing the right ice during a power outage — why block ice lasts longer, why cubes cool faster, and how to use both to keep your cooler at 40 degrees or below. Rather have a hand? My number is (330) 200-8042.
Block Ice vs. Cubes, at a Glance
When the power goes out, the kind of ice in your cooler matters as much as how much you have. Block ice melts slowly and holds its cold for the long haul, while cubes cool fast and pack into every gap around your food. This guide covers when to reach for each, how to make your own block ice for free, and where dry ice and salt-and-ice tricks fit in, for town and rural homes alike. There's a printable 29-page version up top.
Common Questions
1 Which lasts longer, block ice or cubes?
Block ice, by a good margin. It has less surface area for its size, so warm air has less to work with and it melts slowly from the outside in. Cubes melt much faster because there is so much more surface exposed.
2 Can I really make block ice myself at home?
Yes, and it costs you nothing but time. Fill a clean plastic tub or jug with water, leave room at the top for it to expand, and freeze it a few days ahead of time.
3 Should I add salt to make my ice colder?
Not for a cooler. Salt does make ice colder, but that extra cold can freeze or damage food sitting nearby. For food safety, plain ice kept at 40 degrees or below is all you need.
4 How much ice do I actually need for a cooler?
Enough to keep the cooler at 40 degrees or below for as long as the outage might run. A full cooler holds cold longer than a half-empty one, so when in doubt, pack more.
5 Is dry ice worth using instead of regular ice?
It can be for a longer outage, since it is far colder than regular ice. But it needs real care — insulated gloves, fresh air, and never an airtight container — so read up before you use it.
6 What is the best combination of ice to use?
Block ice for lasting cold, plus cubes to chill things fast and fill the gaps around your food. Together they cover both jobs better than either one alone.
Would You Rather I Just Help?
Picking the right ice sounds simple, but plenty of outage questions hide behind it — how much to keep on hand, whether dry ice makes sense for your freezer, whether backup power is worth it for your home. I'll walk through all of it with you, with nothing to sell you. $99 flat for a visit, 30-day come-back-free.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).