How Long To Grill Zucchini Slices In Foil

Grilling zucchini slices in foil usually takes about 10 to 15 minutes on a medium-hot grill, depending on how thick you cut them.
 
That’s the short answer, and it’s honestly one of the easiest ways to get tender, flavorful zucchini without worrying about them falling through the grates.
 
If you’ve ever wondered how long to grill zucchini slices in foil, the timing really comes down to thickness, heat level, and whether you’re going for a soft bite or a bit of char.
 
In this post, we’ll walk through exactly how long to grill zucchini slices in foil, how to prep them so they turn out perfect, and the little tricks that make a big difference.
 

How Long to Grill Zucchini Slices in Foil

Grilling zucchini slices in foil takes roughly 10 to 15 minutes at medium heat, but let’s break that down so you nail it every single time.
 
The foil packet steams the slices while they cook, which is why they stay so moist and tender.
 
Here’s what actually determines how long to grill zucchini slices in foil:
 

1. Thickness of Your Slices

If you slice your zucchini about ¼ inch thick, they’ll be done in 8 to 10 minutes.
 
Go thicker, around ½ inch, and you’re looking at 12 to 15 minutes.
 
Thin slices cook fast and can turn mushy, so keep an eye on them.
 

2. Grill Temperature

Medium heat, around 375°F to 400°F, is the sweet spot for grilling zucchini slices in foil.
 
Too hot and the outside burns before the inside softens.
 
Too low and you’ll be waiting 20 minutes or more for them to cook through.
 

3. Foil Packet Size and Sealing

A tightly sealed foil packet traps steam, which speeds up cooking.
 
If your packet is loose or open, the slices take longer and dry out.
 
So seal those edges well when you grill zucchini slices in foil.
 

How to Grill Zucchini Slices in Foil Perfectly

Getting the timing right is only half the battle, so here’s how to set yourself up for success.
 

1. Slice Evenly

Uniform slices mean uniform cooking, so grab a sharp knife and aim for consistent thickness.
 
This is the number one reason people end up with some burnt slices and some raw ones.
 

2. Toss With Oil and Seasoning

A little olive oil keeps the slices from sticking and helps them caramelize.
 
Add salt, pepper, garlic powder, or whatever herbs you love before they hit the grill.
 

3. Use Heavy-Duty Foil

Regular foil can tear, especially when you’re flipping or moving the packet.
 
Heavy-duty foil holds up better and keeps your zucchini slices safely inside.
 

4. Flip Once Halfway Through

Around the 5 or 6 minute mark, carefully flip the whole packet over.
 
This helps everything cook evenly when you grill zucchini slices in foil.
 

5. Check for Tenderness

Pierce a slice with a fork, and if it slides in easily, they’re done.
 
If there’s resistance, give them a couple more minutes and check again.
 

Tips for Grilling Zucchini Slices in Foil

These little tricks make a big difference, so keep them in mind next time you fire up the grill.
 

1. Don’t Overcrowd the Packet

If you pile too many slices in one packet, they steam instead of roast.
 
Use two packets if you’re cooking a lot, so the zucchini slices in foil have room to breathe.
 

2. Add a Splash of Liquid

A tablespoon of water, broth, or even lemon juice adds flavor and helps them steam nicely.
 
Just don’t overdo it, or you’ll end up with soggy slices.
 

3. Open the Foil at the End

For the last 2 to 3 minutes, open the foil so the slices get a bit of char.
 
This gives you the best of both worlds when you grill zucchini slices in foil.
 

4. Watch for Doneness

Zucchini goes from perfect to mushy fast, so stay nearby.
 
Once they’re tender, pull them off the grill right away.
 

So, How Long to Grill Zucchini Slices in Foil?

Grilling zucchini slices in foil takes about 10 to 15 minutes on a medium-hot grill, depending on thickness and heat.
 
The foil steams them beautifully, keeping every slice tender and full of flavor.
 
Just slice evenly, season well, seal the packet, and check for tenderness around the 10-minute mark.
 
Now you know exactly how long to grill zucchini slices in foil, so go fire up that grill and enjoy.