How Long to Boil Potatoes (for Mashed Potatoes and Potato Salad)

By The Recipes by Mom kitchen · Last checked October 21, 2026 · Not kitchen-tested; see how our recipes are made

How long potatoes need to boil depends on their size and how you cut them. For mashed potatoes, 1-inch cubes will be tender in about 10 to 15 minutes. Small whole potatoes for potato salad take 15 to 20 minutes, while whole medium potatoes can take 20 to 25 minutes.

These times are a reliable starting point, but the best way to check for doneness is by testing the texture with a fork or knife. The time ranges cover the most common preparations for mashed potatoes and potato salad.

How Long to Boil Potatoes (for Mashed Potatoes and Potato Salad): time chart

Table source: Typical ranges from standard cooking practice, not an official chart. Ovens, grills and pieces vary: start checking at the low end of each range.

Good to know

• Starting in cold water helps potatoes cook evenly
• Waxy potatoes (red, Yukon Gold) hold their shape better for salads; russets mash fluffier
• Potato salad with mayonnaise should not sit out more than 2 hours

What affects the cooking time

The most important factor that determines how long potatoes take to boil is their size. Heat needs to travel from the hot water to the center of each piece. Smaller pieces, like 1-inch cubes, cook much faster because there is less distance for the heat to penetrate. Larger, whole potatoes require more time to cook through to the middle.

Starting the potatoes in cold water helps them cook more evenly. If you drop potatoes into already boiling water, the outside can become soft and waterlogged before the inside is fully cooked. Bringing the water to a boil with the potatoes already in it ensures the heat penetrates at a more gradual, even rate.

The type of potato also affects the final result. Starchy potatoes, like russets, have a drier, fluffier texture when cooked, which makes them ideal for mashing. Waxy potatoes, such as red or Yukon Gold varieties, are firmer and hold their shape well after boiling, making them a better choice for potato salad.

How to tell when potatoes are done

While the clock is a good guide, the best way to know if your potatoes are cooked is to test them. The ideal texture depends on the dish you are making.

For mashed potatoes, the goal is a very soft, tender potato that will mash easily. You can test this by piercing a cube with a fork. If the fork slides in with very little resistance and the potato falls apart easily, it is ready.

For potato salad, the potatoes should be tender all the way through but still firm enough to hold their shape when sliced and mixed with other ingredients. Pierce a potato with the tip of a paring knife. It should slide to the center easily, but the potato should not crumble or fall apart. Overcooked potatoes will become mushy in a salad.

Tips for better boiled potatoes

• Cut pieces evenly. For potatoes to cook at the same rate, it is helpful to cut them into uniform sizes. This prevents having some pieces that are mushy while others are still hard in the center.
• Salt the water. Adding salt to the cooking water seasons the potatoes from the inside out as they cook.
• Use enough water. The potatoes should be fully submerged in water. This ensures they are surrounded by heat and cook evenly.
• Simmer, do not boil rapidly. Once the water reaches a boil, reduce the heat to a steady simmer. A violent, rolling boil can cause the potatoes to knock against each other and break apart, especially on the outside.
• Handle potato salad safely. If you are making potato salad with a mayonnaise-based dressing, it should not be left at room temperature for more than 2 hours.

Sources and method

• USDA FSIS Safe Minimum Internal Temperature Chart
• Time ranges not marked as USDA are typical ranges from standard cooking practice

Last checked October 21, 2026.