How Long to Cook Sweet Corn on the Cob for Tender Kernels

Fresh, husked sweet corn on the cob usually takes 4 to 6 minutes in boiling water; start checking small or especially tender ears at 4 minutes. This simple stovetop method cooks four ears until juicy and bright, ready to serve with butter, salt, or your favorite toppings.

Ingredients

4 medium ears sweet corn (about 1.2 kg before husking), husks and silk removed
4 qt water (3.8 L), or enough to cover the ears in your pot
2 tbsp unsalted butter (28 g), for serving
1/4 tsp fine salt (about 1.5 g), or to taste

Instructions

Husk and inspect the corn. Pull away the husks and as much silk as you can. Snap or cut off any tough stem ends if they will not fit in the pot. Rinse the ears under cool running water to remove loose silk and any grit. If an ear is too long for your pot, cut it crosswise in half; the pieces cook in the same amount of time.
Bring the water to a boil. Pour 4 qt (3.8 L) water into a large pot, using enough to submerge the corn without risking a boil-over. Cover the pot and bring the water to a full boil over high heat, which takes about 10 minutes on many stovetops. The exact time depends on the pot, burner, and starting water temperature. There is no need to add salt to the water; season the corn after cooking.
Add the ears carefully. Use tongs to lower the corn into the boiling water. If the ears are not completely submerged, turn them once or add a little more boiling water. Let the water return to a steady boil. If adding the corn stops the boil briefly, that is fine; begin timing when the water is bubbling steadily again.
Boil for 4 to 6 minutes. Cook uncovered at a steady boil. Check a kernel at the 4-minute mark by lifting an ear with tongs and piercing a kernel with the tip of a small knife or tasting a cooled kernel. The kernels should be hot, plump, and tender with a slight pop, not firm and starchy. Give larger or less-tender ears another minute or two, checking again rather than automatically cooking them much longer.
Drain and season. Lift the ears out with tongs and let excess water drip back into the pot. Set them on a platter, brush with the butter, and sprinkle with salt to taste. Serve promptly while hot. The corn continues to soften a little from its own heat, so avoid leaving it sitting in the hot cooking water.

Tips

Use the boil as your timer cue. The 4-to-6-minute range starts when the water has returned to a steady boil after the corn goes in. Timing from the moment you add cold ears can lead to uneven results because pots recover at different speeds.
Choose corn that feels fresh. Look for green, snug husks and plump kernels visible through the husk. Freshly picked corn is often sweet and tender quickly. Corn that has been stored longer can become starchier, so it may need an extra minute or two; check its texture instead of relying only on the clock.
Do not crowd the pot. Four medium ears fit comfortably in a large pot. If you are cooking a larger batch, use a second pot or cook in batches so the water can return to a boil promptly. A crowded pot cools down more and makes the timing less predictable.
Season at the table for flexibility. Butter and salt are a straightforward finish, but you can leave some ears plain for guests to customize. If you prefer salted butter, use it and taste before adding extra salt. A squeeze of lemon or lime adds brightness without changing the cooking time.

Serving Suggestions

Serve the corn as soon as it is drained, either whole on a platter or cut into shorter pieces for easier handling. Set out butter and salt separately if people have different preferences. For a simple summer meal, pair it with grilled vegetables, a green salad, baked potatoes, or a main dish such as grilled chicken or fish. If serving several sides, keep the ears warm on a covered platter rather than leaving them in the cooking water, where they can become waterlogged.

For a more generous topping bar, offer chopped herbs, black pepper, grated hard cheese, lemon wedges, or a little chili powder. Put napkins and corn holders nearby if you have them, but they are not essential. To remove kernels for a salad or grain bowl, stand a cooled ear upright on a stable cutting board and slice downward with a sharp knife, keeping the blade close to the cob. Add the kernels just before serving so they retain their texture.

Variations

Steam it instead: Add about 1 inch (2.5 cm) of water to a pot, set a steamer basket above the water, and bring it to a boil. Add the husked ears, cover, and steam for about 6 to 8 minutes, checking for tenderness. Steaming is handy when you want to keep the ears out of a large volume of water, but the doneness test is the same: kernels should be hot and tender.

Grill for a lightly charred finish: Brush husked ears lightly with oil and grill over medium-high heat, turning every few minutes, for about 8 to 12 minutes total, until tender with scattered brown spots. Grill times depend on the heat and the size of the ears. For a softer, less-charred result, wrap each ear in foil with a small pat of butter; unwrap carefully because trapped steam is hot.

Make a tangy herb topping: Stir 2 tbsp (28 g) softened butter with 1 tsp (5 ml) lemon juice, 1 tbsp (about 4 g) chopped parsley, and a pinch of black pepper. Spread it over hot corn. You can swap parsley for cilantro or chives; the flavor changes, but the method and corn cooking time stay the same.

Add a savory, spicy finish: Brush the cooked ears with butter or olive oil, then dust lightly with chili powder and grated cheese. Add the seasoning gradually so it does not overpower the sweetness. If you like more tang, finish with a small squeeze of lime. These are optional serving ideas rather than ingredients needed for the basic boiled-corn method.

Storage and Reheating

Let leftover corn cool briefly, then refrigerate it within 2 hours of cooking in a covered container or tightly wrapped. Keep the ears whole if you plan to reheat them, or cut off the kernels for faster storage and use in another dish. Cooked corn keeps for 3 to 4 days in the refrigerator. For longer storage, remove the kernels or wrap the cooled ears well and freeze them; use within about 2 to 3 months for best quality.

To reheat whole ears, place them in a covered microwave-safe dish with a spoonful of water and heat in short intervals, turning as needed. You can also warm them in a covered pan with a splash of water. Reheat leftovers to 165°F (74°C), as recommended by USDA FSIS. Avoid repeated cycles of warming and cooling, which can dry out the kernels. Frozen cooked corn can be added directly to soups or sautés, or thawed overnight in the refrigerator before reheating.

Frequently Asked Questions

How long should I boil sweet corn on the cob?

For fresh, husked ears, boil for 4 to 6 minutes once the water has returned to a steady boil. Start checking at 4 minutes, especially if the ears are small or very fresh. Large ears or corn that has been stored longer may take closer to 6 minutes, but taste or pierce a kernel to judge doneness rather than extending the cook by a long stretch.

How can I tell when corn on the cob is done?

The kernels should look plump and feel tender when pierced, while still having a little bite. Taste one after allowing it to cool briefly, since a kernel straight from boiling water can burn your mouth. If it is hard or tastes starchy, cook the ear for another minute and check again. Color alone is not a reliable doneness test.

Do I need to add salt or sugar to the water?

No. Plain water is enough to cook the corn, and you can add salt to the butter or directly to the ears when serving. Sweetness varies by corn, so taste before adding extra seasoning. A small amount of sugar in the cooking water is not necessary for fresh sweet corn and will not make older corn taste freshly picked.

Can I cook corn on the cob without removing the husks?

Yes, but the timing and method differ. For boiling, remove the husks and silk so the ears cook evenly and are easy to handle. For grilling, some cooks leave the husks on after soaking the ears briefly, while others husk them and cook directly on the grate for char. Follow the method you choose and check the kernels for tenderness; husk-on grilling can take longer than boiling.

Can I boil frozen corn on the cob?

Yes. Add frozen ears directly to boiling water and cook until hot and tender, usually about 5 to 8 minutes depending on their size and whether they are individually frozen or stuck together. Start checking after 5 minutes and separate the ears with tongs if needed. The water will stop boiling briefly when the frozen corn goes in, so begin timing again after it returns to a steady boil.

Why did my corn turn tough or chewy?

Older corn, overcooking, or holding ears in hot water after they are done can all make the texture less pleasant. Buy fresh ears when possible, keep the boil brief, and drain them as soon as the kernels are tender. If the corn is already somewhat mature, a couple of extra minutes may soften it, but prolonged boiling will not restore the sweetness of freshly harvested corn.

More recipes to cook

Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

Spotted an error? Tell us and we will correct it (corrections policy).