How Long Does It Take to Roast Vegetables?

Quick Answer

20–45 minutes at 400–425°F for most vegetables. The exact time depends on the vegetable type, how you cut it, and your oven temperature. Tender vegetables like asparagus and cherry tomatoes roast in 15–20 minutes, while dense root vegetables like potatoes and beets need 35–45 minutes.

Roasting Times by Vegetable

Vegetable	Cut Size	Temp	Roasting Time
Asparagus	Whole spears	425°F	12–15 min
Bell peppers	1-inch strips	425°F	20–25 min
Broccoli	Florets	425°F	18–22 min
Brussels sprouts	Halved	400°F	25–30 min
Butternut squash	1-inch cubes	400°F	30–35 min
Carrots	1/2-inch rounds	425°F	25–30 min
Cauliflower	Florets	425°F	25–30 min
Corn on the cob	Whole, husked	400°F	20–25 min
Eggplant	1-inch cubes	425°F	20–25 min
Green beans	Whole, trimmed	425°F	15–20 min
Mushrooms	Halved or whole	400°F	20–25 min
Onions	Wedges	400°F	30–35 min
Potatoes	1-inch cubes	425°F	30–40 min
Sweet potatoes	1-inch cubes	425°F	25–35 min
Zucchini	1/2-inch half-moons	425°F	15–20 min
Beets	1-inch cubes	400°F	35–45 min
Cherry tomatoes	Whole	400°F	15–20 min
Parsnips	1/2-inch rounds	400°F	30–35 min

The Best Oven Temperature for Roasting

Oven temperature has a major impact on your results:

• 375°F: Gentler roasting. Good for delicate vegetables or when roasting alongside a protein. Takes 5–10 minutes longer.
• 400°F: The sweet spot for most root vegetables. Even browning with a tender interior.
• 425°F: Ideal for most vegetables. Produces the best caramelization and crispy edges.
• 450°F: Maximum browning. Best for thin or quick-cooking vegetables like asparagus and green beans. Watch carefully to avoid burning.

For the crispiest results, preheat your oven fully before adding the vegetables, and use a sheet pan that has been preheating in the oven.

How to Roast Mixed Vegetables Evenly

The biggest challenge with a mixed vegetable sheet pan is that different vegetables cook at different rates. Here are three strategies:

Strategy 1: Stagger additions. Start with the longest-cooking vegetables (potatoes, carrots, beets), then add faster-cooking ones (broccoli, zucchini) partway through.

Strategy 2: Cut to match. Cut denser vegetables into smaller pieces and softer vegetables into larger pieces so they finish at the same time. For example, dice carrots into 1/4-inch pieces but cut zucchini into 1-inch chunks.

Strategy 3: Use separate pans. Group vegetables by cooking time on different sheet pans and pull each one when it is done.

Keys to Perfect Roasted Vegetables

• Don't overcrowd the pan. Vegetables need space for steam to escape. Overcrowding causes steaming instead of roasting. Use two sheet pans if needed.
• Use enough oil. Toss vegetables with 1–2 tablespoons of oil per pound. Oil conducts heat and promotes browning.
• Cut evenly. Uniform pieces cook at the same rate. This is the most common mistake home cooks make.
• Flip once. Toss or flip vegetables halfway through roasting for even browning on all sides.
• Season after roasting with delicate herbs, citrus, or vinegar. Sturdy seasonings like garlic, salt, and dried herbs can go on before.
• Use a rimmed sheet pan, not a glass baking dish. Metal conducts heat better and the low sides allow steam to escape.
• Line with parchment paper for easy cleanup without sacrificing browning.

Roasting Whole Vegetables

Some vegetables roast well whole, but they take significantly longer:

• Whole beets: 45–60 minutes at 400°F, wrapped in foil
• Whole garlic head: 35–40 minutes at 400°F, top sliced off, drizzled with oil
• Whole cauliflower head: 50–70 minutes at 400°F
• Whole sweet potato: 45–60 minutes at 400°F
• Whole acorn squash (halved): 40–50 minutes at 400°F, cut side down

How to Tell When Vegetables Are Done

Roasted vegetables are done when they are:

• Fork-tender — a fork slides in easily with slight resistance
• Caramelized — golden brown edges with some charred spots
• Slightly shrunken — they will reduce in size by about 20–30% as moisture evaporates