Roasting time can vary slightly depending on your oven and the thickness of your carrots sticks, but the average time is 15 – 20 minutes when roasted at 425 degrees Fahrenheit.   To keep the roasting consistent, do your best to cut all carrot sticks to the same thickness. This will ensure they all cook at the same speed and helps to eliminate burning some carrots while undercooking others. We try to keep our carrot sticks about 3 inches long and 1/3 inch wide.