Corn on the Cob: How to Boil, Grill & Freeze It
Corn on the cob seems like it should be the easiest thing in the world to cook, right up until you're standing over a pot wondering if five minutes is too long or not nearly enough. Between boiling, grilling, microwaving, and "How do I freeze it?”, there's more to get wrong than you'd think.
Whether you're cooking a few ears for dinner or a big batch for a cookout, this guide covers three fresh cooking methods, how to freeze corn on the cob properly so it doesn't turn mealy, and how to cook it once it's frozen, since that's not quite the same process as starting from fresh.
How to Boil Corn on the Cob
Boiling is the most common way to cook corn on the cob, and there are two methods that both work well, depending on how much attention you want to give it.
Active boil: Bring a large pot of water to a rolling boil. Add the shucked corn and boil for 3 to 4 minutes if the ears are small to medium, or 5 to 6 minutes for larger ears. Pull them as soon as the kernels turn bright yellow and feel tender when pierced.
Boil and shut off: Bring the water to a boil, drop the corn in, cover the pot, and immediately turn off the heat. Let it sit undisturbed for 10 minutes. This method is more forgiving if you're not watching the clock closely, and it works well if you need to hold the corn warm a little longer before serving; it can sit covered in the hot water for up to 30 minutes without overcooking.
Either method gets you tender corn. The active boil gives you more control over doneness if you like your corn on the firmer side; the shut-off method is more hands-off.
How to Grill Corn on the Cob
Shuck the corn and coat it lightly with oil or butter. Place it directly on a preheated grill over medium-high heat and cook for 10 to 15 minutes, turning every few minutes so it chars evenly on all sides.
If you'd rather grill it in the husk, soak the unshucked ears in water for 30 to 45 minutes first so the husks don't burn, then grill for a similar amount of time. The husk steams the corn from the inside while the outside picks up a little smoky flavor, and shucking afterward is easy since the silk mostly comes away with the husk.
How to Microwave Corn on the Cob
This is the fastest method, and it barely requires any prep. Leave the corn in its husk, place it directly on a microwave-safe plate, and microwave on high for 3 to 4 minutes per ear. Add about 2 minutes for each additional ear if you're cooking more than one at a time.
Let the corn rest for a minute or two after microwaving since it holds heat well. Once it's cool enough to handle, cut off the stem end and the corn should slide right out of the husk, silk and all.
How to Freeze Corn on the Cob
If you've got more corn than you can eat while it's in season, freezing it properly now means better corn later.
Husk the ears, remove the silk, and rinse them. Bring a large pot of water to a boil and blanch the corn before freezing: 7 minutes for small ears (about 1¼ inches in diameter or less), 9 minutes for medium ears (up to 1½ inches), and 11 minutes for large ears (over 1½ inches). Corn needs a longer blanch than most vegetables because the heat has to travel all the way through the cob, not just the kernels.
As soon as the blanching time is up, transfer the corn straight into an ice bath and let it cool for the same amount of time you blanched it. This step matters: if the cobs aren't completely cold before they go in the freezer, they can develop an off, "cobby" taste. Once cooled, pat the corn dry, wrap each ear tightly, and store in freezer bags with as much air pressed out as possible. Frozen corn on the cob keeps well for 8 to 12 months.
You technically can skip the blanching step, and it won't make the corn unsafe to eat. But unblanched corn loses flavor, color, and texture faster in the freezer, so it's worth the extra few minutes if you want your corn to still taste good in a few months.
How to Cook Corn on the Cob From Frozen
Frozen corn on the cob can go straight from the freezer into most cooking methods, no need to thaw first. The one exception is grilling, where a short thaw first helps the corn cook through evenly before the outside chars.
Boiling: Add the frozen corn directly to boiling water and cook for 5 to 8 minutes, until heated through.
Grilling: Let the corn thaw for about 10 minutes so it grills evenly, then grill over medium heat for 5 to 7 minutes, turning occasionally, until it's tender and lightly charred.
Microwaving: Microwave on high for 4 to 6 minutes per ear, which is just a bit longer than the fresh-corn timing to account for the frozen start.
FAQ
How long do you boil corn on the cob?
Fresh corn takes 3 to 6 minutes at an active boil, depending on the size of the ears, or 10 minutes using the boil-and-shut-off method, where you turn off the heat as soon as the corn goes in and let it sit covered. Frozen corn takes 5 to 8 minutes and doesn't need to be thawed first.
Do you have to blanch corn before freezing it?
It's not required for food safety, but it's strongly recommended for quality. Blanching stops the enzyme activity that causes frozen corn to lose flavor, color, and texture over time. Whole ears need 7 to 11 minutes depending on size; unblanched corn is safe to eat but won't hold up as well in the freezer.
Can you cook frozen corn on the cob without thawing it first?
Yes, and for boiling and microwaving you should. Frozen corn cooks more evenly straight from the freezer. The one exception is grilling, where letting the corn thaw for about 10 minutes first helps it cook through before the outside chars too much.
How long does frozen corn on the cob last?
Properly blanched and frozen corn keeps for 8 to 12 months in the freezer. For the best texture and flavor, try to use it within that window rather than letting it sit longer.
Why does my frozen corn taste "off" or cobby?
This usually means the corn wasn't cooled completely before freezing. After blanching, corn needs to sit in an ice bath for as long as it was blanched, until the cobs are fully cold, before it goes in the freezer.
What's the best way to reheat frozen corn on the cob?
Boiling and microwaving both work well straight from frozen. Grilling works too, but give the corn a short thaw first so it heats through before it chars.