While the turkey roasts, combine the vegetables and rosemary on a rimmed baking sheet. Drizzle with oil and season with salt and pepper; toss to combine. Cover with foil.
After the turkey has roasted an hour, place the vegetables on the second rack in the oven. Roast 1 1/2 hours, uncover, and roast 30 minutes longer, tossing occasionally until vegetables are tender and golden brown.