Baked potatoes in the oven need about an hour at 400°F for a fluffy interior and crisp skin. But if you want to know exactly how long to cook a baked potato in the oven, the answer depends on a few things: the size of your potato, the temperature you choose, and whether you wrap it in foil or not.
Most medium russet potatoes take 50 to 65 minutes at 400°F. Small ones finish in about 40 minutes. Large ones can take 75 minutes or more.
This guide breaks it all down so you get perfect results every time.
How Long To Cook A Baked Potato In The Oven
The simple answer is 50 to 65 minutes at 400°F for a medium potato. But lets look at the details, because size and temperature change everything.
Time Chart By Potato Size At 400°F
- Small potato (5 to 7 ounces): 40 to 50 minutes
- Medium potato (8 to 10 ounces): 50 to 65 minutes
- Large potato (12 ounces or more): 70 to 90 minutes
These times are for potatoes baked directly on the oven rack, with no foil. If you wrap in foil, add about 10 to 15 minutes because the skin steams instead of crisping.
How Temperature Changes The Cooking Time
You can bake potatoes at other temps too. Here is how it works:
- 350°F: 70 to 80 minutes for a medium potato. Slower, but the skin stays softer.
- 375°F: 60 to 70 minutes. A good middle ground.
- 400°F: 50 to 65 minutes. The sweet spot for fluffy insides and crisp skin.
- 425°F: 45 to 55 minutes. Faster, with a very crispy skin. Watch it closely so it does not burn.
- 450°F: 40 to 50 minutes. Only for smaller potatoes. The skin can scorch.
Stick with 400°F if you want the best balance of time and texture.
Why Russet Potatoes Work Best For Baking
Russet potatoes are the classic choice. They have high starch and low moisture. That means a fluffy, light interior when baked.
Yukon Golds are a decent second option. They are creamier and waxier, so the inside is a bit denser. Red potatoes do not bake as well because they hold too much water.
Pick potatoes that are firm and free of green spots. Green means solanine, which is not good to eat. Also avoid potatoes with soft spots or sprouts.
Step-By-Step: How To Bake A Potato In The Oven
- Preheat your oven to 400°F. Let it fully heat up, about 15 minutes.
- Wash the potatoes under cold water. Scrub the skin with a brush to remove dirt.
- Dry them well with a clean towel. Dry skin equals crispy skin.
- Poke each potato 6 to 8 times with a fork. This lets steam escape so they do not burst.
- Rub a little olive oil over each potato. This helps the skin crisp and makes salt stick.
- Sprinkle with sea salt or kosher salt. You can add black pepper too.
- Place the potatoes directly on the middle oven rack. Put a sheet of foil on the rack below to catch drips.
- Bake for 50 to 65 minutes for medium potatoes. Flip them halfway through with tongs.
- Check for doneness. A fork or skewer should slide in with no resistance.
- Let them rest for 5 minutes before cutting. This lets the steam finish cooking the inside.
Should You Wrap Potatoes In Foil?
No, not if you want crispy skin. Foil traps steam, which makes the skin soft and wet. It also steams the inside instead of baking it.
If you must use foil, do it only for the last 15 minutes. Or skip it all together. The oven rack gives the best results.
How To Tell When A Baked Potato Is Done
Do not rely on the timer alone. Ovens run hot or cold, and potatoes vary in size. Use these checks:
- A fork or thin skewer slides in easily with no push back.
- The skin feels dry and slightly wrinkled.
- The potato gives a little when you squeeze it with a towel or mitt.
- An instant-read thermometer reads 205°F to 210°F in the center.
If the fork meets resistance, bake it another 5 to 10 minutes and check again.
Common Mistakes That Ruin Baked Potatoes
Not Poking Holes In The Potato
Steam builds up inside. Without holes, the potato can burst and make a mess in your oven. Always poke 6 to 8 holes with a fork.
Using The Wrong Oven Rack
The middle rack is best. It gives even heat all around. Do not use the bottom rack, it bakes the bottom too fast.
Opening The Oven Too Often
Every time you open the door, the temp drops. That adds minutes to your cook time. Use the oven light to check on them instead.
Cutting The Potato Too Soon
Let it rest 5 minutes first. The inside keeps cooking from the stored heat. Cut early and the middle may still be firm.
How To Get Fluffy Insides And Crisp Skin
Follow these tips and your potatoes will turn out great.
- Choose potatoes that are all the same size so they finish at the same time.
- Dry the skin completely before adding oil.
- Use a light coat of olive oil, not a heavy pour.
- Bake on the rack, not on a baking sheet lined with foil.
- Flip once halfway through for even browning.
- Rest before serving, then cut a deep cross in the top and fluff with a fork.
For extra flavor, brush with bacon fat or butter instead of oil. Both give a rich taste and a crisp finish.
Can You Bake Potatoes Ahead Of Time?
Yes. Bake them fully, cool to room temp, then store in the fridge in a sealed container for up to 3 days.
To reheat, put them back in a 400°F oven for 15 to 20 minutes. Or use an air fryer at 400°F for 8 to 10 minutes. The microwave works too, but the skin will lose its crisp.
Foil, Salt, And Oil: Quick Answers
Does Salt Make The Skin Crispy?
Salt pulls out a little moisture and adds flavor. It does not make the skin crispy on its own. The oil and dry heat do that job.
Should You Use A Baking Sheet?
You can, but the bottom of the potato will not get as crisp. If you use one, line it with parchment, not foil. Better yet, place the potatoes right on the rack.
What About Convection Ovens?
Convection ovens cook faster because the fan moves hot air around. Drop the temp to 375°F and check at 45 minutes. The skin gets very crisp this way.
Final Word On Bake Time
So how long do you cook a baked potato in the oven? For a medium russet at 400°F, plan on 50 to 65 minutes. Small ones take about 40 minutes. Large ones can take 75 to 90 minutes.
Use a fork to test for doneness, not just the clock. Every oven is a little different. Once you nail the timing for your oven, you will get a fluffy inside and a crispy skin every single time.