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How Long to Boil Potatoes (Whole, Cubed, for Mashing or Salad)
Boiling times for potatoes — whole vs cubed, by size, for mashing vs salad, starting cold-water method.
Boil whole small potatoes in 15-20 minutes, whole medium potatoes in 20-25 minutes, large in 30-40 minutes, and cubed potatoes (1-inch) in 10-15 minutes. Start potatoes in cold salted water, bring to a boil, then simmer at medium heat until a fork or knife slides through with no resistance. For mashing, use starchy russets; for salad, use waxy Yukon Golds or red potatoes.
How Long to Boil Whole Potatoes?
Time depends on size, not weight. The center of the potato must reach about 205-210°F (96-99°C) for the starch to fully gelatinize, and heat must travel from the boiling water’s surface temperature (212°F at sea level) to that center.
| Potato Size | Diameter | Whole Boil Time |
|---|---|---|
| Baby / new potatoes | 1-1.5 in | 10-15 min |
| Small | 2 in | 15-20 min |
| Medium | 2.5-3 in | 20-25 min |
| Large | 3.5-4 in | 30-40 min |
| Extra large | 4+ in | 40-50 min |
How Long for Cubed Potatoes?
Cubed potatoes cook dramatically faster because heat penetrates from all sides simultaneously. Standard 1-inch cubes take 10-15 minutes; 1/2-inch cubes take 7-10 minutes; 2-inch chunks take 15-20 minutes. For mashed potatoes, larger cubes (1.5-2 inches) absorb less water and produce a less watery mash.
Why Start Potatoes in Cold Water?
This is the most consistently broken rule in home cooking. Starting potatoes in cold water means the interior and exterior cook at the same rate as the water gradually heats. Throwing potatoes into already-boiling water cooks the exterior much faster than the interior — by the time the center is done, the outer layer is mushy and waterlogged.
Cold-water start is especially important for whole potatoes. For 1/2-inch dice, the time difference is small enough that hot-water start is acceptable.
How Much Salt in the Water?
Generously — about 1 tablespoon of kosher salt per quart of water, or “salty like the sea.” Salt seasons the potato through the boil rather than just the surface, and it slightly raises water temperature (a small effect). Unsalted boiled potatoes taste flat no matter how much salt you add at the table.
For Mashing vs. For Salad: Which Potato?
| Use | Best Potato | Why |
|---|---|---|
| Mashed | Russet (Idaho) | High starch, low moisture — fluffy result |
| Mashed (creamy) | Yukon Gold | Medium starch, buttery flavor |
| Potato salad | Red potatoes | Waxy, holds shape |
| Potato salad | Yukon Gold | Slight starch, creamy texture |
| Boiled for sides | Yukon Gold, red, fingerlings | Holds shape on the plate |
| Soup / chowder | Yukon Gold | Stays intact, thickens lightly |
| Roasted | Russet or Yukon Gold | Crisps well |
How to Tell When Boiled Potatoes Are Done
- Knife test. A paring knife slides into the thickest part with no resistance — but does not so easily that the potato falls apart.
- Fork test. A fork tine penetrates and exits cleanly.
- Visual. Skin starts to crack slightly. (Stop here for potato salad; overcooked potatoes lose their shape.)
Drain immediately when done. Potatoes left in hot water continue absorbing moisture and become waterlogged.
What About Boiling for Mashed Potatoes?
For the best mashed potato texture, boil peeled russet potatoes cubed into 1.5-2 inch chunks, starting in cold salted water, for about 15-20 minutes until fork-tender. Drain, then return to the hot pan over low heat for 30 seconds to evaporate any clinging surface moisture. Mash while still hot. Cold potatoes glue up the starch and produce gummy mash.
What About Boiling for Potato Salad?
For potato salad, boil whole small red or Yukon Gold potatoes (skin on) in salted water, starting cold, for 18-22 minutes. Drain, let cool to room temperature, then cube. The cooler temperature firms the starch so cubes hold their shape in the salad. Hot potatoes added directly to dressing produce a mushy salad.
Frequently Asked Questions
How long to boil potatoes for mashed potatoes?
15-20 minutes for 1.5-2 inch cubes of russet potatoes, starting in cold salted water.
How long to boil whole potatoes?
Small whole potatoes: 15-20 min. Medium: 20-25 min. Large: 30-40 min.
Do you boil potatoes in cold or hot water?
Cold water. Lets the inside and outside cook at the same rate.
How long to boil red potatoes?
About 15-20 minutes for small whole red potatoes (1.5-2 inch diameter).
Should I peel potatoes before boiling?
For mashed: yes. For potato salad and side dishes: optional — skins add texture and nutrition.
Why are my boiled potatoes gummy?
Over-mashed, or mashed cold. Mash while still hot and stop before they look glossy.
How long to boil baby potatoes?
About 10-15 minutes for 1-1.5 inch baby or “new” potatoes.
Can I boil potatoes ahead of time?
Yes. Boil, drain, cool, and refrigerate up to 3 days. Reheat in the microwave or by re-warming in the oven.
For full citations and methodology, see our sources page.
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