How Long Does It Take To Roast Cauliflower And Broccoli

Roasting cauliflower and broccoli takes about 20 to 30 minutes in a 425°F (220°C) oven.
 
Cauliflower usually needs the full 25 to 30 minutes, while broccoli tends to finish faster at 18 to 22 minutes.
 
If you’ve been wondering how long to roast cauliflower and broccoli together, the answer depends on how you cut them, how crowded your pan is, and whether you’re roasting them separately or on the same sheet.
 
In this post, we’ll break down exactly how long to roast cauliflower and broccoli, how to prep them for even cooking, and the simple tricks that get both veggies perfectly tender with crispy edges.
 
Let’s get to it.
 

How Long to Roast Cauliflower and Broccoli: The Quick Answer

Roasting cauliflower and broccoli is one of the easiest ways to get a delicious side dish on the table, and the timing is pretty forgiving once you know the basics.
 
Here’s the quick breakdown:
 

1. How Long to Roast Broccoli

Broccoli roasts in about 18 to 22 minutes at 425°F.
 
Small florets can be done in as little as 15 minutes, while larger pieces may take up to 25.
 
You’ll know your broccoli is ready when the tips are crispy and browned and the stems are fork-tender.
 
The key to roasting broccoli well is drying it thoroughly before it hits the pan, because wet broccoli steams instead of roasting.
 

2. How Long to Roast Cauliflower

Cauliflower takes a little longer, usually 25 to 30 minutes at 425°F.
 
Cauliflower florets are denser than broccoli, so they need more time to soften and caramelize.
 
Cut them into similar-sized pieces, toss with oil, and spread them in a single layer.
 
When the edges turn golden brown and a knife slides in easily, your cauliflower is done.
 

3. How Long to Roast Cauliflower and Broccoli Together

If you’re roasting cauliflower and broccoli on the same sheet pan, plan for about 25 to 30 minutes total.
 
The trick is to give the cauliflower a head start.
 
Roast the cauliflower alone for 8 to 10 minutes, then add the broccoli and roast everything for another 18 to 20 minutes.
 
That way, both vegetables finish at the same time without one turning to mush while the other stays raw.
 
This is the easiest way to answer the question of how long it takes to roast cauliflower and broccoli when they share a pan.
 

What Affects Roasting Time for Cauliflower and Broccoli

Even with the numbers above, roasting cauliflower and broccoli isn’t an exact science.
 
Here are the main factors that change how long your veggies take:
 

1. Floret Size

Bigger florets take longer to roast, plain and simple.
 
If you cut large chunks, expect closer to 30 minutes for cauliflower and 25 for broccoli.
 
Small, bite-sized pieces roast much faster, sometimes in 15 to 18 minutes.
 
Aim for uniform pieces so everything cooks at the same rate.
 

2. Oven Temperature

Most recipes for roasting cauliflower and broccoli call for 400°F to 425°F.
 
At 400°F, add about 5 extra minutes to the times above.
 
At 450°F, things move faster but you’ll need to watch closely so the edges don’t burn.
 
Whatever temperature you choose, preheat the oven fully before the pan goes in.
 

3. Pan Crowding

This one trips up a lot of people.
 
If your cauliflower and broccoli are piled on top of each other, they’ll steam rather than roast, and the cooking time becomes unpredictable.
 
Spread them out with space between the pieces, and use two pans if you need to.
 
A crowded pan is the number one reason roasted cauliflower and broccoli turn out soggy.
 

4. How Dry the Vegetables Are

Moisture is the enemy of crispy roasted cauliflower and broccoli.
 
Wash the veggies early, then pat them completely dry with a towel before tossing them in oil.
 
Any water left on the surface will create steam in the oven and slow down browning.
 

Tips for Perfectly Roasted Cauliflower and Broccoli

A few small moves make a big difference when roasting cauliflower and broccoli:
 

1. Use Enough Oil but Not Too Much

About 2 to 3 tablespoons of olive oil for a large sheet pan is plenty.
 
Too little oil and the veggies dry out; too much and they turn greasy instead of crispy.
 
Toss everything until each piece is lightly coated.
 

2. Season Simply and Generously

Salt, pepper, and garlic powder are all you really need for roasted cauliflower and broccoli.
 
Add the seasoning before roasting so it sticks to the oiled surface.
 
A squeeze of lemon or a sprinkle of parmesan after roasting adds a nice finishing touch.
 

3. Flip Halfway Through

Give the pan a shake or flip the pieces with a spatula about halfway through the roasting time.
 
This helps cauliflower and broccoli brown evenly on all sides instead of just on the bottom.
 

4. Check Early the First Time

Ovens run hot or cold, so check your veggies a few minutes before the timer goes off, especially the first time you roast cauliflower and broccoli in your oven.
 
Crispy edges and tender stems are what you’re after.
 

So, How Long Does It Take to Roast Cauliflower and Broccoli?

Roasting cauliflower and broccoli takes about 20 to 30 minutes at 425°F, with broccoli finishing in roughly 18 to 22 minutes and cauliflower needing 25 to 30.
 
When roasted together on one pan, give the cauliflower an 8 to 10 minute head start before adding the broccoli.
 
Size, temperature, crowding, and moisture all shift the timing a bit, so keep an eye on the oven the first time around.
 
Now that you know how long to roast cauliflower and broccoli, you can get a crispy, caramelized side dish on the table any night of the week.