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Grilling zucchini on a gas grill usually takes about 8 to 12 minutes total, depending on how thick you slice it and how hot your grill is running.
That’s the short answer, but getting perfect grill marks and a tender bite every time means knowing a few more details.
If you’ve been wondering how long to grill zucchini on a gas grill so it comes out charred outside and soft inside, this guide will walk you through everything.
We’ll talk about prep, temperature, timing, and the little tricks that make grilled zucchini taste like it came off a steakhouse menu.
So fire up that gas grill, and let’s get into it.
How Long to Grill Zucchini on a Gas Grill
When you grill zucchini on a gas grill, timing depends mostly on the cut and the heat.
Here’s a quick breakdown so you know exactly what to expect.
1. Sliced Lengthwise (Spears or Planks): 8 to 10 Minutes
Slicing zucchini lengthwise into planks or spears is the most popular way to grill it on a gas grill.
These pieces are usually about half an inch thick, so they need roughly 4 to 5 minutes per side over medium-high heat.
That gives you that soft, juicy interior with those beautiful char lines on the outside.
2. Round Slices: 6 to 8 Minutes
If you cut zucchini into round slices about a quarter to half an inch thick, they’ll cook a bit faster.
Plan on about 3 to 4 minutes per side on a gas grill set to medium-high.
Just keep an eye on them because thin rounds can go from perfectly grilled to burnt pretty quickly.
3. Whole Zucchini: 15 to 20 Minutes
Grilling whole zucchini on a gas grill takes the longest, but it’s also the easiest method.
You’ll want to cook it over medium heat, turning every 4 to 5 minutes, until the skin is charred and the inside is fork-tender.
This method works great when you’re short on prep time and just want to toss something on the grill.
4. Zucchini Chunks or Kabobs: 10 to 12 Minutes
Cut zucchini into thick chunks for kabobs, and they’ll need about 10 to 12 minutes total on a gas grill.
Turn them every few minutes so all sides get that smoky char.
Chunks hold up well on skewers and pair nicely with onions, peppers, and cherry tomatoes.
How to Prep Zucchini for a Gas Grill
Good grilled zucchini starts before it ever hits the grates.
Here’s how to prep it right so your zucchini grills evenly and doesn’t stick.
1. Choose Firm, Medium-Sized Zucchini
Small to medium zucchini work best on a gas grill because they have fewer seeds and firmer flesh.
Oversized zucchini tend to be watery and mushy once grilled.
Look for zucchini that feel heavy for their size with shiny, unblemished skin.
2. Slice Evenly for Consistent Cooking
Whatever shape you choose, keep your cuts uniform so every piece grills at the same rate.
Uneven slices mean some pieces burn while others stay raw.
A sharp knife or mandoline makes quick work of this.
3. Salt and Rest to Remove Excess Water
Sprinkle your sliced zucchini with salt and let it sit for 15 to 20 minutes.
This draws out excess moisture so your zucchini grills instead of steaming.
Pat the slices dry with paper towels before moving on.
4. Brush With Oil and Season
Lightly coat your zucchini with olive oil so it doesn’t stick to the gas grill grates.
Then season with salt, pepper, garlic powder, or whatever herbs and spices you love.
Keep it simple so the natural flavor of the zucchini shines through.
Tips for Grilling Zucchini on a Gas Grill
These tips will help you nail the timing and get restaurant-quality results every single time.
1. Preheat Your Gas Grill Properly
Set your gas grill to medium-high heat and let it preheat for 10 to 15 minutes with the lid closed.
A hot grill gives you those instant sear marks and prevents sticking.
If you’re grilling whole zucchini, medium heat works better so the inside cooks through.
2. Clean and Oil the Grates
Scrape your grates clean, then brush them with a little oil using tongs and a paper towel.
This extra step keeps your zucchini from tearing when you flip it.
It also makes cleanup way easier later.
3. Don’t Walk Away
Zucchini grills fast, so stay close to the grill while it cooks.
One minute too long and you’ll have sad, limp slices instead of perfectly tender ones.
Set a timer if you tend to get distracted.
4. Flip Only Once
Resist the urge to keep flipping your zucchini on the gas grill.
Let each side cook undisturbed so you get those deep grill marks.
One flip halfway through is all it needs.
5. Use a Grill Basket for Small Pieces
If you’re grilling zucchini cubes or slices, a grill basket keeps them from falling through the grates.
It also makes tossing and turning them much easier.
This is a game changer when you’re grilling zucchini on a gas grill for a crowd.
So, How Long to Grill Zucchini on a Gas Grill?
Grilling zucchini on a gas grill takes about 8 to 12 minutes for sliced pieces, and up to 20 minutes for whole zucchini.
The exact time depends on your cut, your grill temperature, and how tender you like your zucchini.
Stick with medium-high heat, prep your zucchini properly, and keep an eye on it as it cooks.
Once you know how long to grill zucchini on a gas grill, it becomes one of the easiest and tastiest sides you can make.
So grab some zucchini, fire up the grill, and enjoy that smoky, tender goodness tonight.