How Long Does a Baked Potato Cook in the Oven? | Time & Temp

A medium russet potato bakes in 45-60 minutes at 425-450°F, or about 1 hour 15 minutes at 400°F, depending on its size.

You pull a potato from the oven after a full hour, slice it open with confidence, and find a center that’s still firm and waxy. The outside looks perfectly done, but the inside didn’t catch up. That gap between appearance and doneness is the most common baked potato frustration, and it almost always comes down to mismatched oven temperature and potato size.

Baking a potato well isn’t complicated, but the timing depends on two factors: the temperature you choose and the size of the potato. At 450°F a medium russet is typically done in about 45 minutes, while at 400°F the same potato may need up to 1 hour and 15 minutes. This guide walks through the temperatures, times, and doneness tests that take the guesswork out.

Oven Temperature and Timing

The three most common baking temperatures are 400°F, 425°F, and 450°F, and each produces a slightly different result. At 450°F the potato cooks fast with a very crisp skin and a fluffy center — America’s Test Kitchen recommends this temperature for a roughly 45-minute bake on a medium russet.

At 425°F the timing stretches to 45 to 60 minutes. This temperature is a solid middle ground, offering crispy skin without the higher risk of burning that comes at 450°F. Potatoes at 400°F need the longest time, typically 1 hour to 1 hour and 15 minutes, but the wider window makes timing less fussy.

Potato size shifts every one of these windows. A small potato around 6 ounces at 425°F may be done in 40 minutes, while an extra-large baker of 12 ounces or more at the same temperature could need a full hour. Checking doneness is always more reliable than watching the clock.

Why Temperature Choice Matters

Different oven temperatures do more than change the cook time — they affect the texture of both the skin and the interior. Here’s what each range delivers for a medium russet potato.

• Crispy skin at 450°F: Higher heat dries out the surface quickly, creating a shatteringly crisp skin. The trade-off is a shorter window between done and overdone, so keep an eye on it after 40 minutes.
• Fluffy interior at 400°F: Lower heat lets the interior steam gently, producing a light, airy texture. The skin still turns crisp, but it takes longer to develop fully.
• Flexible timing at 425°F: This temperature works well for a range of potato sizes without close monitoring. It’s the most forgiving option if you’re baking potatoes of different sizes together.
• Even cooking on the rack: Baking directly on the oven rack, not on a sheet pan, allows hot air to circulate around the entire potato and prevents a soft, steamed bottom.

The Idaho Potato Commission recommends 400°F for one hour as a reliable baseline for medium potatoes. If you prefer a crispier skin, bump the temperature to 450°F and check for doneness around the 45-minute mark.

The Science of the Perfect Baked Potato

The texture of a baked potato comes down to internal temperature, not just time. Potato starch begins to gelatinize around 190°F, but the ideal texture — light, fluffy, and dry — develops at 205°F to 210°F. Per the perfect baked potato temperature guide from America’s Test Kitchen, reaching that range is what separates a good baked potato from a great one.

At 205°F to 210°F, the remaining moisture inside the potato converts to steam, which pushes starch granules apart and creates the signature fluffy interior. A potato pulled at 200°F will still taste fine, but the texture will be slightly denser — closer to a mashed-potato consistency than a light baker.

Using an instant-read thermometer is the most precise way to check. Insert it into the center of the largest potato. If it reads 205°F or higher, the potato is done. Without a thermometer, a fork or skewer should slide in with almost no resistance, and the skin should feel dry and crisp to the touch.

Those ranges assume a medium russet potato around 8 to 10 ounces. For smaller potatoes, aim for the short end of the range. For larger ones, plan on the long end and check with a thermometer to be sure.

How to Tell When It’s Done

A timer is a helpful guide, but the most reliable way to confirm doneness is with a physical test. Here are three methods, ranked from most to least precise.

1. Check the internal temperature: Insert an instant-read thermometer into the center of the largest potato. When it registers 205°F to 210°F, the potato is fully cooked regardless of size or oven quirks.
2. Test with a fork or skewer: Pierce the potato through the thickest part. The fork should slide in with no resistance at all. Any firmness or crunch means it needs more time in the oven.
3. Look at the skin: A fully baked potato has skin that looks dry, slightly wrinkled, and feels crisp when touched. If the skin still feels soft or damp, give it another 10 to 15 minutes.

The Idaho Potato Commission recommends the fork test as the primary check for most home cooks. If the potato passes the fork test but the skin isn’t as crisp as you’d like, return it to the oven for 5 to 10 minutes directly on the rack.

Tips for the Crispiest Skin and Fluffiest Interior

Small steps before and after baking make a real difference in texture. Simply Recipes explains in its baked potato 400 degrees guide that rubbing the potato with oil and salt before baking helps the skin crisp evenly while seasoning the exterior at the same time.

Pierce the potato several times with a fork before it goes in the oven. Those small holes allow steam to escape during baking and prevent the potato from bursting. Baking directly on the oven rack — never on a sheet pan — ensures hot air reaches every side for even crisping.

Once the potato is done, cut it open within 5 minutes of pulling it from the oven. This releases trapped steam and stops the interior from turning soggy as it cools. Fluff the inside with a fork, add your toppings, and serve right away for the best texture.

The Bottom Line

The ideal baking time for a potato depends on the oven temperature and the size of the potato. At 450°F, plan on 45 minutes to 1 hour for a medium russet. At 400°F, allow 1 hour to 1 hour and 15 minutes. Checking for an internal temperature of 205°F to 210°F or testing with a fork is more reliable than any timer.

Experiment with temperatures within the 400°F to 450°F range to find the balance of crispy skin and fluffy interior that suits your preference. Your oven’s hot spots and temperature cycling mean the first batch might need a few extra minutes, and that’s perfectly normal.