How Long to Bake a Sweet Potato at 425°F

The short answer

For a baked sweet potato 425°F oven, plan on 45–60 minutes for a medium whole potato. Smaller potatoes may finish in 35–45 minutes, while very large ones can take 60–75 minutes. Ovens vary, and thickness matters more than weight, so use the times as a guide and check the center before serving.

How to prepare it

Heat the oven to 425°F. Scrub the sweet potatoes and dry them well. Pierce each whole potato several times with a fork, spacing the holes around the skin. Set them on a rimmed sheet pan to catch syrupy drips as they bake. For crisper skin, bake the potatoes uncovered—do not wrap them in foil.

• Rub the skin lightly with oil if desired.
• Season the outside with salt for a savory finish.
• Leave space between potatoes for even cooking.

Whole sweet potatoes: timing and doneness

Place whole potatoes on the sheet pan and bake until the skin looks wrinkled and the potato gives easily when pressed with an oven mitt. The most reliable test is a thin knife or skewer inserted through the thickest part: it should slide to the center with little resistance. If the middle still feels firm, continue baking in 5–10 minute increments.

Halved sweet potatoes

Halving sweet potatoes shortens the bake time and exposes more surface for browning. Cut them lengthwise, lightly oil the cut sides, and arrange them cut-side up on the sheet pan. Bake for about 30–40 minutes, depending on thickness. They are ready when the center is completely tender and the cut edges are browned. Very thick halves may need additional time.

Serving and storing

Let baked sweet potatoes stand for a few minutes, then split them open and fluff the flesh with a fork. Add butter, salt, cinnamon, or your preferred toppings. If you are saving leftovers, cool them promptly and refrigerate them in a covered container. Reheat until hot throughout, and use refrigerated leftovers within 3–4 days.