Russet potatoes in the oven offer a fluffy interior and golden skin when you know the right time and temperature combination. Most people ask how long to cook russet potatoes in the oven, and the honest answer is 50 to 70 minutes at 400°F (204°C) for a medium to large potato. That range depends on size, oven accuracy, and whether you wrap them in foil or leave the skin bare.
This guide breaks down exact times by weight, temp options, and the small tricks that make a difference. You will also learn how to tell when a potato is truly done, not just warm on the outside.
Quick Answer: Time And Temperature At A Glance
Here is the short version if you are already preheating the oven.
- Medium russet (8 to 10 oz): 50 to 60 minutes at 400°F
- Large russet (12 to 14 oz): 60 to 70 minutes at 400°F
- Small russet (6 to 7 oz): 40 to 50 minutes at 400°F
- At 350°F: add 15 to 20 minutes to each range above
- At 425°F: subtract 5 to 10 minutes, but watch the skin closely
These times assume you prick the skin with a fork and place the potato directly on the middle rack. Foil wrapped potatoes cook a bit faster but the skin steams instead of crisps.
How Long To Cook Russet Potatoes In The Oven
Let us go deeper into the timing so you can plan a meal without guessing.
Timing By Potato Size
Size matters more then anything else. A russet that weighs 14 ounces needs a solid 65 to 70 minutes at 400°F. A 9 ounce potato is usually ready at 55 minutes. Use a kitchen scale if you want repeatable results.
Medium Russets
These are the ones sold in most bags at the grocery store. Plan on 50 to 60 minutes. They finish evenly and the inside turns fluffy without drying out.
Large Russets
Big baking potatoes take 60 to 70 minutes. If the potato is very thick in the middle, add 5 more minutes and check again.
Small Russets
Smaller potatoes cook in 40 to 50 minutes. They are great for meal prep because they cool fast and reheat well.
Timing By Oven Temperature
Oven temp changes everything. Here is how each setting plays out.
- 350°F: 65 to 85 minutes. Slower, but the skin stays tender.
- 375°F: 60 to 75 minutes. A good middle ground.
- 400°F: 50 to 70 minutes. Best balance of speed and texture.
- 425°F: 45 to 60 minutes. Faster, crispier skin, more attention needed.
- 450°F: 40 to 55 minutes. Works, but the skin can burn before the center is soft.
If your oven runs hot or cold, buy an inexpensive oven thermometer. A 25 degree difference can shift cooking time by 10 minutes or more.
Foil Vs No Foil
Wrapping in foil traps steam. The potato cooks in about 45 to 55 minutes at 400°F, but the skin comes out soft and pale. Leaving it bare gives you that crisp, salty skin people love. It takes a little longer, around 50 to 70 minutes, but the texture is far better.
A common compromise: bake bare for 45 minutes, then wrap in foil for the last 10 minutes if you want a softer skin.
Step By Step Baking Method
- Preheat the oven to 400°F. Let it fully heat, about 15 minutes.
- Scrub each russet under cold water and pat dry.
- Prick the skin 6 to 8 times with a fork so steam can escape.
- Rub a thin layer of olive oil or vegetable oil over the skin.
- Sprinkle kosher salt and black pepper on all sides.
- Place potatoes directly on the middle oven rack, spaced apart.
- Put a sheet of foil on the rack below to catch drips.
- Bake 50 to 70 minutes depending on size.
- Check at the 50 minute mark with a fork or instant read thermometer.
- Rest 5 minutes before slicing open.
An instant read thermometer should hit 205°F to 210°F in the center. That is the sweet spot for a fluffy inside.
How To Tell When They Are Done
Do not rely on the clock alone. Use these checks.
- A fork slides in with almost no resistance
- The skin looks slightly wrinkled and feels dry
- Internal temp reads 205°F or higher
- The potato gives a little when you squeeze it with a towel
If the fork still meets resistance in the middle, give it 10 more minutes and test again. Undercooked russets taste chalky and dense.
Common Mistakes To Avoid
Most failed baked potatoes come down to a few small errors.
- Not preheating fully, which adds 10 to 15 minutes
- Crowding the rack so heat cannot circulate
- Skipping the prick, which can cause the potato to burst
- Using too much oil, which makes the skin soggy
- Cutting it open too soon, which releases steam and dries the inside
Also, avoid storing baked potatoes at room temperature for more then two hours. Cool them and refrigerate if you are not eating right away.
Reheating And Make Ahead Tips
You can bake russets ahead and reheat them without losing quality. Bake fully, cool, then refrigerate up to 4 days. Reheat at 350°F for 15 to 20 minutes, or in the microwave for 2 to 3 minutes. The skin will not be as crisp, but the inside stays fluffy.
For a faster weeknight option, par-bake potatoes for 30 minutes, cool, and finish them later for 25 to 30 minutes. This splits the cooking time across two days.
With the right temp and a little patience, russets come out perfect every time. Start at 400°F, check at 50 minutes, and trust the fork test over the timer.