How Long to Boil Sweet Potatoes

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

Boiling sweet potatoes takes about 10 to 15 minutes for 1-inch cubes and 25 to 35 minutes for whole, medium sweet potatoes. The final cooking time depends on the size of the pieces and your intended use, such as making a mash, a salad, or a simple side dish.

This page provides time ranges for boiling sweet potatoes until they are fully cooked and tender. The timings in the data table are a general guide, but we suggest always testing for doneness yourself, as the exact size and density of each potato can vary.

How Long to Boil Sweet Potatoes: 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

• Drain well before mashing so the mash is not watery

What affects the cooking time

Several factors determine how long it takes to boil sweet potatoes. Understanding them will help you use the time chart effectively and achieve consistent results.

• Size of the pieces: This is the most significant factor. Smaller pieces have more surface area exposed to the hot water, so they cook much faster. As shown in the data, 1-inch cubes cook in about half the time of a whole potato. For even cooking, it is best to cut all pieces to a uniform size.
• Simmer versus a rolling boil: The times provided are for cooking at a simmer, which is when the water produces small, gentle bubbles. A vigorous, rolling boil can cause the sweet potatoes to cook too quickly on the outside, leading them to break apart and become waterlogged before the center is tender. A steady simmer cooks them gently and evenly.
• Starting water temperature: For dense root vegetables like sweet potatoes, starting them in cold water and bringing it all to a boil together helps the heat penetrate the vegetable evenly. This prevents the exterior from becoming mushy while the inside is still firm.

How to check for doneness

A timer is a helpful guide, but the best way to know if sweet potatoes are cooked is to test their texture. The method depends on their size.

For cubed or diced sweet potatoes, the goal is to have them become fork-tender. To check, lift a piece out of the water with a slotted spoon and pierce it with the tines of a fork. If the fork slides through with very little resistance, the piece is done. If you have to apply pressure, it needs more time.

For whole sweet potatoes, use the tip of a thin, sharp knife, like a paring knife. Insert the knife into the thickest part of the potato. If it slides in easily to the center, the potato is ready. This test is more reliable than using a fork on a large potato, as a fork can break the surface and give a false impression of tenderness.

Always test more than one piece to ensure they are all cooked through, especially if they were not cut to a perfectly consistent size.

Tips for better results

A few simple techniques can improve the outcome of your boiled sweet potatoes.

• Choose similar-sized potatoes: When boiling whole potatoes, try to select ones that are roughly the same size and shape. This ensures they will all finish cooking at around the same time.
• Salt the water: Adding salt to the cooking water seasons the sweet potatoes from the inside out as they boil. This seasons the sweet potatoes more evenly than adding salt only after cooking.
• Scrub whole potatoes: If you are boiling sweet potatoes with the skin on, be sure to scrub them well under running water to remove any dirt.
• Drain thoroughly: After cooking, drain the sweet potatoes immediately and completely. For mashed sweet potatoes, this step is critical. Excess water left clinging to the pieces will result in a thin, watery mash. Let them sit in the colander for a minute to allow steam to escape and carry away surface moisture.

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.