How Long to Bake a Potato at 400°F

Choose the method for the skin you want

For a fluffy russet with a drier skin, my preference is the unwrapped method. Foil shifts the result toward steaming. Similar-sized potatoes also make a shared finishing time more realistic, although each center still needs checking. Treat the time range as a cue to check, not a guarantee.

Pick potatoes that will finish together

A tray of similarly sized russets is easier to manage than one tiny potato beside a very large one. Size affects the distance heat must travel to the center. The number of potatoes alone does not tell you how long the largest one needs.

If the sizes vary, plan to check and remove them individually. Avoid promising that every potato on the tray will be ready at the same minute. A practical dinner plan includes a little room for the largest potato to finish.

Prepare the skin and preheat the oven

Scrub the potatoes under running water, dry them, and pierce the skin with a fork. Start with a preheated oven so the timing reference has a clear beginning. Putting potatoes into a cold oven adds a variable that the one-hour estimate does not describe. If you would rather use an air fryer, the oven to air fryer converter gives a starting estimate to check.

Arrange them with space around them rather than stacking them. Follow a complete recipe for any oil or salt on the skin. Toppings can be prepared while the potatoes bake, but keep perishable toppings refrigerated until needed.

Check the center instead of the clock alone

A skewer or fork should enter the center without a hard, resistant core. Check the thickest part. The Idaho Potato Commission also gives about 210°F internally as a useful doneness reference for its russet method.

That temperature describes the desired cooked texture; it is not the same kind of rule as a minimum temperature for raw poultry. If the center is still firm, continue baking and check again. A finished timer does not soften an undercooked center.

Foil changes the result

Wrapping traps moisture and changes how the skin cooks. The commission recommends baking without foil for its method because foil encourages steaming. If you want a drier, crisper skin, keep that distinction in mind before wrapping every potato.

Do not combine a foil-wrapped method's expectations with an unwrapped method's texture promises. Choose the result you want and follow the corresponding recipe. A photograph of crisp skin is not evidence that a wrapped potato will produce the same finish.

One potato is ready and the larger one is still firm

At the first check, a skewer slides through the smaller potato but meets a hard center in the larger one. I would leave the larger potato cooking and avoid declaring the batch finished just because the hour has passed. Check the thickest part of each potato rather than testing only near the skin.

For the next meal, selecting comparable sizes is easier than trying to invent a precise number of extra minutes for every additional ounce. If you are coordinating a quick-cooking main dish, wait until the potatoes are close before starting its final stage. Keep finished food under appropriate serving or storage conditions; wrapping a cooked potato and leaving it on the counter is not a substitute for a safe holding plan.

Serve, cool, and store with a plan

Open the cooked potato carefully because trapped steam is hot. Add cold toppings just before serving rather than leaving topped potatoes out while the rest of dinner is prepared. Make only as many finished servings as you need immediately.

Refrigerate leftovers promptly. Remove foil before cooling and storage if it was used, and avoid leaving wrapped baked potatoes at room temperature. A cooked potato is not a shelf-stable food simply because it began as an uncut vegetable.