Position rack in lower third of oven; preheat to 450 degrees F.
Combine oil, herbs, lemon zest, salt and pepper in a large bowl. Add beets; toss to coat with the seasoning mixture.
Spread the beets evenly on a rimmed baking sheet.
Roast, stirring once or twice, until the beets are tender and browned, 20 to 25 minutes. Toss the roasted vegetables with lemon juice, if using.