How Long To Cook Corn Cob

Corn cobs cook quickly whether you boil, grill, or roast them, but each method has a different sweet spot. If you are wondering how long to cook corn cob, the short answer is 3 to 10 minutes depending on your method.

Get the timing right and you get sweet, juicy kernels. Get it wrong and you get mushy or tough corn. Here is exactly how long each method takes.

The table below gives you quick reference times. Keep in mind that fresh corn cooks faster than older corn, and whole cobs take longer than husked ones.

Boiling: 3 to 5 minutes after the water returns to a boil
Grilling: 10 to 15 minutes in the husk, 8 to 10 minutes husked
Roasting: 25 to 30 minutes in the oven at 400 degrees F
Microwaving: 3 to 4 minutes per cob in the husk
Steaming: 5 to 7 minutes

Those times are for fresh sweet corn. Frozen corn cobs need a couple extra minutes.

Boiling Corn On The Cob

Boiling is the most common method and the fastest. It works best with fresh corn that still has its husk or was picked recently.

How To Boil Corn Cobs Perfectly

Fill a large pot with enough water to cover the cobs.
Bring the water to a rolling boil. Add a pinch of salt if you like.
Drop in the husked cobs. Do not overcrowd the pot.
Cover and cook for 3 to 5 minutes.
Remove with tongs and serve right away.

Do not boil corn for 10 or 15 minutes. That is the biggest mistake people make. Long boiling turns the kernels soft and watery and washes out the natural sugar.

If you are cooking a big batch, boil in shifts so the water stays hot.

Grilling Corn On The Cob

Grilling adds a smoky char that boiling cannot match. The cook time depends on whether you leave the husk on.

Grilled Corn In The Husk

Soak the cobs in cold water for 10 minutes so the husk does not burn.
Heat the grill to medium high.
Place cobs directly on the grates.
Cook for 10 to 15 minutes, turning every few minutes.
The husk should be charred and the kernels tender.

Grilled Corn Without The Husk

Husk the corn and brush it with oil or butter.
Grill over medium heat for 8 to 10 minutes.
Turn every 2 to 3 minutes to get even char marks.

Husked corn cooks faster, so watch it closely. It can go from golden to burnt in under a minute.

Roasting Corn In The Oven

Oven roasting is hands off and great for feeding a crowd. You can roast in the husk or without it.

Roasted Corn In The Husk

Preheat the oven to 400 degrees F.
Place the cobs directly on the rack or on a baking sheet.
Roast for 25 to 30 minutes.
Let them cool for 5 minutes, then peel back the husk.

Roasted Corn Without The Husk

Husk the corn and rub it with butter or olive oil.
Wrap each cob loosely in foil.
Roast at 400 degrees F for 20 to 25 minutes.
Turn once halfway through.

Roasted corn gets a nutty, caramelized flavor. It is worth the extra wait.

Other Ways To Cook Corn Cobs

Microwave Corn In The Husk

This is the fastest option when you are in a hurry. Leave the husk on, cut off the ends, and microwave on high for 3 to 4 minutes per cob. Let it sit for 2 minutes before peeling. The silk comes off much easier this way.

Steamed Corn Cobs

Steaming keeps more nutrients in the kernels than boiling. Set the cobs in a steamer basket over boiling water and cover. Cook for 5 to 7 minutes. The kernels stay crisp and sweet.

Signs Your Corn Cob Is Done

The kernels are bright yellow and plump.
A fork or knife slides in with little resistance.
The corn smells sweet, not starchy.
Biting a kernel gives a soft pop, not a crunch or a mush.

If the kernels look wrinkled or dull, you overcooked them. If they feel hard, give them another minute or two.

Tips For Better Corn Every Time

Cook corn the same day you buy it. Sugar turns to starch fast.
Do not add salt to the boiling water until the end. Some cooks say it toughens the kernels.
Add a spoon of sugar to the boiling water to boost sweetness.
Do not soak husked corn before grilling. It just steams the kernels.
Let grilled or roasted corn rest for a few minutes before eating.

Common Mistakes To Avoid

Boiling for 10 minutes or more. This is the number one error.
Walking away from the grill. Husked corn burns quickly.
Overcrowding the pot, which drops the water temperature.
Peeling the husk before microwaving. The husk traps steam and cooks the corn.
Using old corn and expecting it to taste sweet.

The right cook time for a corn cob comes down to your method and your taste. Start with the shorter time, check the kernels, and add a minute if needed. Fresh corn needs very little cooking to taste its best.

How Long To Cook Corn Cob