If you're shipping food that has to stay cold, the first fork in the road is dry ice or gel packs. Pick wrong and your customer opens a soggy box of thawed product, or you overpay for hazmat handling you never needed. The choice isn't about which is better in general. It's about one thing: does your product need to stay frozen solid, or just cold? This guide lays out dry ice vs gel packs for frozen food shipping side by side, with the safety rules, the carrier limits, and how to pick the right one for what you actually sell.
The short version: Use dry ice when your product must arrive frozen solid, like ice cream, frozen meals, or raw frozen items, because dry ice sits around -109°F and keeps food hard-frozen. Use gel packs when your product just needs to stay cold, like cheese, cured items, or refrigerated meals, because gel packs hold refrigerator temperatures (roughly 32°F to 40°F) but will not keep anything truly frozen. Dry ice is a regulated hazardous material with carrier weight limits and labeling rules; gel packs are unregulated, reusable, and simpler. Match the coolant to the product, size it to your transit time, and never ship so slow the package sits over a weekend.
This guide covers the head-to-head comparison, when to use each, the dry-ice shipping rules, handling safety, sizing, and cost. If you're not yet sure shipping is even allowed for what you make, start with whether you can ship cottage food at all, then come back here to pick your coolant.
Dry ice keeps food frozen and gel packs keep food cold, and that single distinction drives every other difference between them. Here is the full comparison for a small food vendor deciding between the two.
| Factor | Dry Ice | Gel Packs |
|---|---|---|
| Temperature it holds | Around -109°F; keeps product hard-frozen | Around 32°F to 40°F; keeps product cold, not frozen |
| Best for | Ice cream, frozen meals, raw frozen meat or seafood | Cheese, cured meats, produce, refrigerated cooked meals, some baked goods |
| Regulated? | Yes, a Class 9 hazardous material (UN1845) with carrier weight limits and labeling | No special regulation, labeling, or weight cap |
| Reusable? | No, it sublimates away during transit; a fresh cost every shipment | Yes, refreezes and reuses many times |
| Handling | Requires gloves, ventilation, and a warning label | No special handling once frozen |
| Prep before packing | Buy fresh close to ship day | Freeze solid at least 24 hours ahead |
| Disposal | Must sublimate in a ventilated open space | Reusable; most non-compostable gel goes to landfill |
The takeaway you can act on: if what you sell has to stay frozen, you need dry ice, and if it only has to stay cold, gel packs are cheaper, safer, and easier.
The core difference is temperature: dry ice is frozen carbon dioxide that stays around -109°F and keeps food frozen solid, while gel packs are a water-based gel that, once frozen, holds refrigerator-cold temperatures of roughly 32°F to 40°F. That gap of nearly 150 degrees is why they are not interchangeable.
Here is what that means in practice:
The single rule to remember: dry ice is for keeping things frozen, gel packs are for keeping things cold, and using the wrong one is the most common cold-shipping mistake.
Use dry ice whenever your product has to arrive frozen solid. Ice cream, frozen prepared meals, frozen raw meat or seafood, and anything that would be unsafe or ruined if it thawed all need dry ice, because gel packs simply cannot hold a freezing temperature.
Signs your product needs dry ice:
A common rule of thumb is that a well-insulated cooler burns through roughly 5 to 10 pounds of dry ice per 24 hours of transit, so a two-day shipment needs meaningfully more than a one-day shipment. Treat that as a starting estimate and confirm with your supplier, because sublimation rate depends on your box, insulation, and how full it's packed. Whatever you calculate, you also have to stay under your carrier's weight limits, which is the next section. If you sell frozen product, the guide on the best platform to sell frozen food from home covers the selling side that feeds these shipping decisions.
Use gel packs when your product only needs to stay cold, not frozen. Cheese, cured or smoked items, refrigerated cooked meals, fresh produce, and many baked goods travel fine at 32°F to 40°F, which is exactly the range a frozen gel pack maintains for a day or two.
Gel packs are the easier choice for most local vendors because they're cheaper over time and carry no hazmat rules. To use them well:
The clear call: if your product is safe and sellable at refrigerator temperature, gel packs do the job for less money and less hassle than dry ice. Pair them with good insulation, which the companion guide on packaging for pickup and transport covers in more detail.
Dry ice is a regulated hazardous material, so shipping it comes with real rules: carrier weight limits, required labeling, and venting. It's classified as a Class 9 hazardous material under the identifier UN1845, and every major carrier caps how much you can send by air.
The limits and requirements you need to know:
The rule to carry with you: keep dry ice under about 5 pounds per box for USPS or 5.5 pounds for FedEx and UPS, label it, and make sure it can breathe. Ship it sealed or over the weight limit and you're into hazmat territory you don't want.
Yes, dry ice carries two real hazards a small vendor has to respect: it burns skin on contact, and it releases carbon dioxide gas that can build up in enclosed spaces. Neither is a reason to avoid it, but both are reasons to handle it correctly.
The safety essentials:
The bottom line on safety: gloves on, air moving, nothing sealed. Follow those three and dry ice is a routine tool. Ignore them and it's genuinely hazardous.
You size coolant to transit time: more for two-day shipping, less for overnight, and more in hot weather for either one. Undersizing is what causes thawed arrivals, so when in doubt, add a little more and pair it with better insulation.
A practical starting framework:
| Transit time | Dry ice (frozen product) | Gel packs (cold product) |
|---|---|---|
| Overnight / 1 day | ~5 lb (stay under carrier limit) | 1 to 2 packs per small box, more for larger |
| 2 days | More dry ice, up to the 5 to 5.5 lb carrier cap, plus heavier insulation | Roughly 50% more gel than a 1-day trip |
| Hot weather (over ~80°F) | Add insulation, not dry ice past the legal limit | Add packs and insulation |
Two things matter as much as the coolant amount. First, fill empty space in the box so the coolant isn't fighting a large air gap. Second, ship early in the week so a package never sits in a warehouse over a weekend, which is when even a well-packed box fails. If a two-day route would land your package on a Saturday, ship overnight instead or wait until Monday.
Gel packs are usually cheaper over time because you reuse them, while dry ice is a fresh cost every single shipment since it disappears in transit. But the honest answer is that cost follows the product, not your preference: if you sell frozen food, dry ice isn't optional, so the comparison only matters for product that could safely go either way.
How the costs break down:
The takeaway: for merely-cold product, gel packs win on cost and simplicity, and for frozen product, dry ice is a required cost you build into your shipping price. Either way, confirm current dry-ice pricing with a local supplier rather than guessing, since it varies by region.
Before you invest in a cold-shipping setup, it's worth asking whether you need to ship at all. Shipping frozen and refrigerated food is expensive and risky, and for a local vendor, pickup and local delivery sidestep the entire cold-chain problem. Homegrown is a $10-per-month online storefront, with no percentage fees beyond standard payment processing, where customers order and pay ahead and then pick up locally or get a local delivery, so cold product spends minutes in transit instead of days in a box.
That pre-order model also protects you when you do ship. Because customers order before you pack, you only ship what's already sold, instead of guessing and eating the cost of a thawed return. Compare that to shipping frozen through a marketplace like Etsy, where per-transaction fees stack on top of your already-high packaging and dry-ice costs, or taking orders through Instagram DMs with no organized pickup system at all. Homegrown gives you pickup scheduling and local delivery as first-class options, not afterthoughts.
To be clear about what Homegrown does not do: it is not a shipping carrier, it won't print labels, and it won't supply your coolers or dry ice. When you do need to ship, the packing is still on you. What it does is give many local vendors a way to sell cold and frozen product without shipping it at all, and a pre-order system so the shipping you do keep is only ever for confirmed orders. If most of your customers are local, set up your Homegrown storefront and let pickup do the cold-chain work for free.
No. Gel packs only hold refrigerator temperatures of about 32°F to 40°F, so they will not keep ice cream or frozen meals hard-frozen. Anything that must arrive frozen solid needs dry ice. Gel packs are strictly for product that's safe and sellable at cold, not frozen, temperatures.
USPS caps dry ice at 5 pounds per package for air transport and prohibits it to international and military addresses. FedEx and UPS allow up to 5.5 pounds per package under a limited-quantity exemption. Staying under those limits keeps you out of full hazmat shipping requirements.
For small shipments, no. Keeping dry ice under the 5 to 5.5 pound carrier limits qualifies as a limited quantity, so you don't need a hazmat agreement or special shipping papers. You still have to label the package, note the net weight, and make sure it can vent.
Frozen gel packs typically hold cold temperatures for about 24 to 48 hours in a well-insulated box, depending on how many you use, the insulation quality, and the outside temperature. Match the number of packs to your transit time and add more for hot weather or a two-day trip.
No. Dry ice sublimates completely during transit, turning to gas, so it's a one-time cost on every shipment. Gel packs are the reusable option, refreezing and going again for many shipments, which is a big part of why they're cheaper over time.
Frozen food should arrive frozen or at least partially frozen with visible ice crystals, and refrigerated food should arrive at or below 40°F. If cold or frozen food arrives warmer than that, it should not be eaten. Sizing your coolant correctly and shipping fast is how you make sure it arrives safely.
Getting cold shipping right comes down to one clear call: dry ice for frozen, gel packs for cold, sized to your transit time and shipped before the weekend. For a lot of local vendors, though, the smarter move is to skip the box entirely. Start your Homegrown storefront and let local pickup and delivery keep your product cold for you.
