How long to roast sweet potatoes and carrots depends on how you cut them, what temperature you use, and whether you’re roasting them together or separately.
As a general rule, sweet potatoes and carrots roast in about 25 to 35 minutes at 425°F when cut into similar-sized chunks.
If you’re roasting them whole, sweet potatoes can take 45 to 60 minutes, while whole carrots usually need 30 to 40 minutes.
The key is to match the size of your pieces so both vegetables finish cooking at the same time.
In this post, we’ll break down exactly how long to roast sweet potatoes and carrots, plus the tips that make them come out perfectly tender and caramelized every time.
Let’s get to it.
How Long to Roast Sweet Potatoes and Carrots Together
When you roast sweet potatoes and carrots together, the answer to how long to roast sweet potatoes and carrots is roughly 25 to 35 minutes at 425°F.
That said, there are a few factors that change the timing, and here’s what matters most.
1. Cut Size Determines Roasting Time
The single biggest factor in how long to roast sweet potatoes and carrots is how big you cut them.
Half-inch cubes roast in about 20 to 25 minutes.
One-inch chunks take closer to 30 to 35 minutes.
And large wedges or thick slices can take 40 minutes or more.
The trick is to cut both the sweet potatoes and the carrots into the same size so they cook evenly.
2. Oven Temperature Matters
Most recipes call for roasting sweet potatoes and carrots at 400°F to 425°F.
At 425°F, you’ll get nice caramelized edges in about 25 to 30 minutes.
At 400°F, expect closer to 35 to 40 minutes.
Lower temperatures like 375°F work too, but they take 45 minutes or longer and won’t brown as well.
3. Carrots Take Longer Than You Think
Here’s something a lot of people miss when figuring out how long to roast sweet potatoes and carrots.
Carrots are denser than sweet potatoes, so they often need a few extra minutes.
If you cut them the same size, carrots usually finish at the same time as sweet potatoes.
But if your carrots are thicker, give them a head start of about 5 to 10 minutes in the oven before adding the sweet potatoes.
How Long to Roast Sweet Potatoes and Carrots Separately
If you’re roasting sweet potatoes and carrots on their own, here’s how long each one takes.
1. Roasted Sweet Potatoes
Cubed sweet potatoes roast in 25 to 30 minutes at 425°F.
Whole sweet potatoes take 45 to 60 minutes at 400°F until they’re soft all the way through.
Sweet potato wedges usually need 30 to 35 minutes.
2. Roasted Carrots
Baby carrots roast in about 20 to 25 minutes at 425°F.
Carrot sticks or coins take 25 to 30 minutes.
Whole carrots need 30 to 40 minutes at 425°F, or up to 45 minutes if they’re large.
3. Signs They’re Done
Regardless of which vegetable you’re roasting, the doneness test is the same.
A fork or knife should slide in easily with just a little resistance.
The edges should be browned and slightly crispy.
And the centers should be creamy and tender, not mushy.
Tips for Perfect Roasted Sweet Potatoes and Carrots
Getting the timing right is half the battle, but these tips will make your roasted sweet potatoes and carrots even better.
1. Don’t Crowd the Pan
If the pieces are touching or overlapping, they’ll steam instead of roast.
Spread them in a single layer on a large sheet pan.
This helps them brown properly and keeps the roasting time predictable.
2. Use Enough Oil
Toss the sweet potatoes and carrots with 2 to 3 tablespoons of olive oil.
Every piece should have a light coating.
Oil helps them caramelize and keeps them from drying out.
3. Flip Halfway Through
Stir or flip the vegetables at the halfway mark.
This ensures even browning on all sides.
It also helps you check how fast they’re cooking so you can adjust the time if needed.
4. Season Before and After
Season with salt, pepper, and herbs before roasting.
A little flaky salt or fresh herbs after roasting adds a nice finishing touch.
5. Check Early and Often
Ovens vary, so start checking a few minutes before the estimated time.
Pierce a piece with a fork to see how tender it is.
If it’s close, give it another 3 to 5 minutes and check again.
So, How Long to Roast Sweet Potatoes and Carrots?
Sweet potatoes and carrots roast in about 25 to 35 minutes at 425°F when cut into similar-sized chunks.
Carrots are a bit denser, so give them a small head start if your pieces are thicker.
Cut them evenly, spread them in a single layer, and check them a few minutes early to avoid overcooking.
Now you know exactly how long to roast sweet potatoes and carrots, so preheat that oven and get roasting.