How Long to Cook Corn on the Cob in Boiling Water?

Fresh corn on the cob usually needs about 4 minutes in boiling water once the water returns to a boil; very large or less-tender ears may need up to 6 minutes. The simple method keeps the kernels juicy and lets the corn’s natural sweetness shine, with butter and salt added at the table.

Ingredients

4 medium ears fresh sweet corn, about 1½ lb (680 g) total, husks and silk removed
3 qt water (12 cups / 2.8 L), or enough to cover the ears in your pot
2 tbsp unsalted butter (28 g), for serving
¼ tsp fine salt (1.5 g), plus more to taste
⅛ tsp ground black pepper (0.3 g), optional

Instructions

Shuck and prepare the corn. Pull the husks down and away from each ear, then remove the silky strands with your fingers. Snap off the tough stem ends if they will not fit in the pot. Rinse the ears under cool running water to wash away any remaining silk. Keep the ears whole for the classic presentation, or cut them in half crosswise if you are serving children or want smaller portions.
Bring the water to a boil. Pour 3 qt (2.8 L) water into a large pot, leaving enough room for the corn without water spilling over. Bring it to a rolling boil over high heat; this generally takes about 10 minutes, though the time varies with the pot, burner, and amount of water. The water should be bubbling actively before you add the ears. There is no need to add sugar, and salt in the cooking water is optional.
Add the corn and start timing. Lower the ears carefully into the boiling water with tongs. The water will stop bubbling briefly as the cooler corn goes in. Cover the pot to help it return to a boil, watching closely so it does not boil over. Once the water is bubbling again, uncover the pot and cook the corn for 4 minutes. For especially large ears or kernels that seem less tender, cook for up to 6 minutes.
Check for tenderness and drain. Lift one ear out with tongs and press a kernel with the back of a spoon, or taste a small piece after it cools enough to handle. The kernels should be plump, hot, and tender while still holding their shape. If they are firmer than you like, return the ear to the pot for another minute, then check again. Avoid leaving the corn in the hot water after cooking, because it can continue softening.
Season and serve. Drain the ears well and transfer them to a platter. Spread with butter while hot, then sprinkle with the measured salt and optional pepper, adjusting to taste. Serve promptly while the kernels are steaming and the butter is melted.

Tips

Use the boil as your timing cue. Start the 4-minute timer when the water returns to a boil after the corn goes in, rather than as soon as you lower the ears into the pot. That makes timing more consistent even when the water cools for different lengths of time. If the water takes a while to bubble again, keep the pot covered and check that the burner is still on high.
Choose fresh, sweet ears when possible. Look for green, snug husks and kernels that feel plump through the husk. Corn quality and variety affect tenderness, so use the tasting check instead of relying only on the clock. Older corn may need an extra minute or two, but prolonged boiling is not a way to make stale corn taste fresh.
Keep the pot comfortably roomy. The ears should be submerged without being packed tightly together. If your pot is too small, cook the corn in batches rather than forcing the ears into a crowded pot; crowded corn can cool the water more and cook unevenly. Use tongs to handle hot ears instead of reaching into the water.
Season to suit the meal. The recipe uses unsalted butter so you can control the salt at the table. If using salted butter, taste before adding the listed salt. You can also skip butter or replace it with olive oil for a lighter coating, though olive oil has a fruitier flavor and does not taste as creamy.

Serving Suggestions

Serve boiled corn as soon as it is drained, while the kernels are hot. Offer butter, salt, and pepper separately so everyone can season an ear to taste. For easier eating, place corn holders at the ends of each ear; if you do not have holders, cut the ears in half after cooking and serve them on a platter with a small spoon for extra seasonings.

This straightforward corn works well beside grilled or roasted vegetables, burgers, barbecue, baked beans, or a summer salad. For a simple side dish, pair one ear per person with a protein and a crisp green salad. If the rest of the meal is already rich, serve the corn with just a little salt, pepper, or a squeeze of lemon rather than adding a heavy topping.

Variations

Buttery herb corn: Stir 1 tbsp chopped parsley or chives (about 4 g) into the 2 tbsp softened butter (28 g), then spread it over the drained ears. The herbs add a fresh, savory note without changing the cooking time. Thyme or finely chopped cilantro can be used instead, depending on what you are serving.

Chili-lime corn: Replace the pepper with ¼ tsp chili powder (about 0.7 g) and finish each ear with 1 tsp lime juice (5 ml). Add the lime after cooking so its bright flavor stays noticeable. If you like a little heat, use a small pinch of cayenne in place of some of the chili powder.

Cheesy corn: Sprinkle hot, buttered corn with 2 tbsp finely grated Parmesan (10 g) per ear, or use crumbled cotija if available. Cotija is a salty, crumbly Mexican cheese; finely grated Parmesan is an accessible substitute, though it tastes nuttier and melts more readily. Add the cheese just before serving so it clings to the warm kernels.

Plain corn for another recipe: Cook the ears without butter or seasonings if you plan to cut off the kernels for a salad, salsa, or chowder. Let them cool until safe to handle, stand each ear upright on a cutting board, and slice downward with a sharp knife. Keep one hand above the blade and work carefully, since kernels can scatter as they are cut.

Storage and Reheating

For food safety, refrigerate cooked corn within 2 hours of cooking, or within 1 hour if the room or outdoor temperature is above 90°F (32°C). Store whole ears in a covered container or wrap them snugly; keep butter and other toppings separate if you want to preserve the plain corn for another use. Refrigerated cooked corn is best within 3 to 4 days. Cut kernels can be stored in a covered container for the same length of time.

To reheat whole ears, place them in a microwave-safe dish with a tablespoon of water, cover loosely, and heat in short intervals until hot, turning the ears once. You can also warm them in a covered skillet with a splash of water, or briefly dip them into simmering water. Avoid extended reheating, which can make the kernels soft. For dishes containing leftovers, reheat to 165°F (74°C), the USDA FSIS recommendation for leftovers. Cooked corn can also be frozen in an airtight freezer-safe container for about 2 to 3 months for best quality; thaw it in the refrigerator before using, or add frozen kernels directly to a hot dish.

Frequently Asked Questions

How long do you boil corn on the cob? For fresh sweet corn, allow about 4 minutes once the water returns to a boil. Give very large ears or firmer kernels up to 6 minutes, checking tenderness as you go. The exact time depends on the size and freshness of the corn, so taste a kernel if you are unsure.

Do I put corn in before or after the water boils? Add shucked corn after the water reaches a rolling boil. Adding it to already boiling water gives you a clear point to begin timing and helps the kernels cook quickly. Cover the pot briefly to bring the water back to a boil, then uncover and start the cooking timer.

Should I add salt or sugar to the water? Neither is necessary. Salt can season the outside of the kernels, but it is easy to add salt after cooking and adjust it to each person’s taste. Sweet corn does not need sugar in the water; choose fresh corn and avoid overcooking for the best sweet, tender result.

Can I boil corn with the husks on? This recipe is for shucked ears, which cook in a few minutes and are easy to check. Leaving husks on is possible, but it changes the method and makes it harder to judge tenderness; the husks also need to be cleaned of loose dirt. For predictable timing and easy serving, remove the husks and silk before boiling.

How can I tell when corn is done? The kernels should look plump and feel tender when bitten, but they should not be mushy or falling apart. Take one ear out with tongs and taste a kernel once it is cool enough. If it is still too firm, return it to the boiling water for one minute and check again.

Can I cook corn ahead of time? Yes. Cook it until tender, drain it, and refrigerate it within 2 hours in a covered container. Reheat it gently just before serving, or cut off the kernels and use them cold in a salad. For the brightest texture, avoid leaving cooked ears in hot water or holding them warm for a long time.

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

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