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How Long to Bake a Potato (Russet, Sweet, Foil, by Size)
Bake times for russet and sweet potatoes by size, oven temperature, foil vs naked, microwave and air fryer.
Bake a russet potato at 425°F (218°C) for 45-60 minutes for the classic crispy-skin, fluffy-interior result. Sweet potatoes need 45-50 minutes at the same temperature. Smaller potatoes finish faster (35-40 min); large bakers may need 75 minutes. The potato is done when a fork or paring knife slides through with zero resistance — internal temperature 205-210°F (96-99°C). Use our 45-minute timer or 60-minute timer.
How Long to Bake a Russet Potato?
The russet potato is the gold standard for baking — its high starch content and low moisture produce the fluffy, dry interior most cooks want. At 425°F (218°C), a medium russet (8-10 oz) bakes in 45-55 minutes; a large baker (12-16 oz) takes 60-75 minutes. The USDA notes that potatoes must reach an internal temperature of at least 205°F (96°C) for the starch granules to fully gelatinize and the interior to achieve the desired flaky texture.
A faster method: 450°F (232°C) for 40-50 minutes — slightly crisper skin, marginally less even interior. A slower method: 350°F (177°C) for 75-90 minutes — gentler, particularly good when baking multiple potatoes alongside a roast.
How Long to Bake a Sweet Potato?
A sweet potato at 425°F (218°C) takes 45-50 minutes for a medium tuber, 55-70 minutes for a large one. The sugars caramelize when the sweet potato is fully cooked — a good visual cue is seeing dark, sticky syrup oozing from any cracks in the skin. Internal temperature 205-210°F (96-99°C), same as russet.
Foil-Wrapped vs Naked Baking: Which Is Better?
The Idaho Potato Commission and most professional cooks recommend baking potatoes unwrapped, rubbed with oil and salt, directly on the oven rack. Foil traps steam, which steams the potato rather than baking it — the result is a soft, gummy skin and a denser interior. Foil is acceptable if you plan to hold the potato hot for serving (it keeps temperature longer in foil) or if you genuinely prefer soft skin.
Baking Times by Size and Temperature
| Potato Size | Weight | 425°F | 400°F | 350°F |
|---|---|---|---|---|
| Small | 5-7 oz | 35-40 min | 45-50 min | 55-65 min |
| Medium | 8-10 oz | 45-55 min | 55-65 min | 70-80 min |
| Large baker | 12-16 oz | 60-75 min | 70-85 min | 90-100 min |
| Extra large | 16-20 oz | 75-90 min | 85-100 min | 105-120 min |
| Sweet potato (med) | 8-10 oz | 45-55 min | 55-65 min | 70-80 min |
How Long in the Microwave?
For a fast result, microwave the potato for 5-8 minutes on high (a 1000W microwave; adjust proportionally for other wattages), pierce the skin first, and rest 2 minutes before opening. The skin will be soft, not crisp — for crisp skin, finish in a 450°F oven for 10 minutes after microwaving. This hybrid method delivers a baked potato in 20 minutes total.
How Long in the Air Fryer?
Air-fryer baked potatoes at 400°F (204°C) take 35-40 minutes for a medium russet — faster than the oven and with crispier skin thanks to the high air velocity. Rub with oil and salt, place directly on the basket. See our broader air fryer cooking guide for technique parallels.
What Internal Temperature Means Done?
A baked potato is done when the internal temperature reaches 205-210°F (96-99°C), measured with an instant-read thermometer in the thickest part of the potato. Lower temperatures leave starch granules incompletely gelatinized, producing a denser, less fluffy interior. The fork-resistance test correlates well with this temperature in practice.
Why Do You Pierce a Baked Potato?
Piercing the skin with a fork in 4-6 places lets steam escape during baking. An unpierced potato can — rarely but dramatically — explode in the oven as superheated steam builds inside the skin. Even when explosion doesn’t happen, piercing reduces the risk of a soggy interior caused by trapped moisture.
How to Tell When a Baked Potato Is Done
- Fork test. A fork or paring knife slides into the thickest part with no resistance.
- Squeeze test. The potato gives slightly to gentle pressure (use a kitchen towel — the potato is hot).
- Thermometer. Internal temperature 205-210°F (96-99°C).
- Skin appearance. Skin is crisped, slightly papery, and the salt rub has darkened.
Frequently Asked Questions
How long to bake potatoes at 400 degrees?
About 55-65 minutes for a medium russet at 400°F (204°C). Slightly slower than 425°F but more forgiving when timing other dishes.
Can I bake potatoes in foil?
Yes, but the skin will be soft rather than crisp. Foil is best when holding potatoes hot for later service.
How long to bake small potatoes?
Small potatoes (5-7 oz) bake in 35-40 minutes at 425°F.
Should I bake potatoes covered or uncovered?
Uncovered, rubbed with oil and salt, directly on the oven rack — this produces the classic baked-potato texture.
How long to bake multiple potatoes?
Time stays roughly the same as baking one — about 45-55 minutes for medium russets at 425°F — provided the oven is preheated and the potatoes are spaced for airflow.
Why is my baked potato hard inside?
Underbaked. Internal temperature didn’t reach 205°F. Return to the oven for another 10-15 minutes and re-test with a fork.
Can I bake potatoes ahead?
Yes. Bake fully, then hold wrapped in foil in a warm oven (170-200°F) for up to an hour without significant texture loss.
How long do leftover baked potatoes keep?
Per USDA food safety guidelines, refrigerate within 2 hours and consume within 3-4 days.
For full citations and methodology, see our sources page.
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