Name: Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe
Prep time: 10 min
Cook time: 6 min
Total time: 20 min
Cuisine: American
Ingredients: 2 medium sized zucchini; 2 medium sized yellow squash; ¼ cup extra-virgin olive oil; 1 Tablespoon Dijon mustard; 1 teaspoon garlic, finely minced; 1 teaspoon dried thyme; ½ teaspoon kosher salt; ¼ teaspoon black pepper; ¼ teaspoon crushed red pepper flakes

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I’m so excited to share this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe, one of my absolute favorite ways to enjoy fresh summer veggies. There’s something so bright and vibrant about the tangy dijon marinade combined with the natural sweetness of zucchini and yellow squash gently charred on the grill. It’s light, flavorful, and totally addictive — perfect for those warm evenings when I want a dish that’s both simple and packed with personality.

Why You'll Love This Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe

Whenever I make this recipe, I fall in love all over again with its bold yet balanced flavor profile. The sharp, slightly spicy dijon mustard marries beautifully with olive oil, garlic, and just the right hint of thyme, creating a marinade that elevates the humble zucchini and yellow squash into something really special. The grilling adds that perfect smoky char, which enhances the natural sweetness of the veggies and makes every bite feel fresh and exciting. It’s honestly one of those dishes that surprises guests because it’s simple, but tastes so gourmet.

What I really appreciate is how easy this grilled zucchini and yellow squash with dijon marinade recipe is to pull together. The ingredients are straightforward and pantry-friendly, and the prep takes just minutes before everything hits the grill. It’s a recipe that feels like a treat but doesn’t demand hours in the kitchen — perfect for weeknight dinners or a last-minute side at weekend cookouts. Plus, it pairs with so many mains, so I always find myself recommending it for everything from casual family meals to special holiday gatherings.

Ingredients You'll Need

The image shows fresh ingredients arranged neatly on a white marbled surface. There are two bright yellow squashes placed side by side on the left. To the right, two dark green zucchinis lie parallel to each other. Above the zucchinis, a light purple garlic bulb is placed. Above the garlic, a small white bowl holds three spices: coarse white salt, black pepper, and red pepper flakes, arranged in small piles. Below the garlic, a white bowl holds dried thyme with visible fine greenish-brown leaves. To the bottom left, a small white bowl contains creamy Dijon mustard with a smooth texture. Next to it, a white cup is filled with golden olive oil. The composition is clean and simple with bright natural lighting, and the photo is taken with an iphone --ar 4:5 --v 7

This recipe uses a handful of simple ingredients, each playing an important role in achieving that perfect balance of flavor, color, and texture. The freshness of the zucchini and yellow squash is essential, while the marinade ingredients bring zest, subtle heat, and herbaceous notes to the dish.

Quick Tip

All ingredient amounts are listed in the recipe card below

Zucchini: I prefer medium-sized to get the perfect bite-sized slices that hold up well on the grill.
Yellow squash: Its vibrant color pairs beautifully with zucchini for a visually stunning dish.
Extra-virgin olive oil: This adds a rich, fruity base to the marinade, helping coat and soften the veggies.
Dijon mustard: The star of the marinade, it brings tanginess and depth of flavor that makes the veggies pop.
Garlic: Finely minced, it offers a punch of savory warmth without overpowering the dish.
Dried thyme: Its woodsy, herby notes complement the mustard and garlic perfectly.
Kosher salt and black pepper: Essential for seasoning and enhancing all the other flavors.
Crushed red pepper flakes: Just enough heat to add a kick without overwhelming the subtle flavors.

Directions

Step 1: Slice the zucchini and yellow squash lengthwise into pieces about ¼ to ½ inch thick. This thickness keeps them sturdy enough to grill without falling apart while still tenderizing nicely.

Step 2: In a large bowl, whisk together the extra-virgin olive oil, dijon mustard, finely minced garlic, dried thyme, kosher salt, black pepper, and crushed red pepper flakes to create the marinade.

Step 3: Add the sliced zucchini and yellow squash to the bowl with the marinade. Toss gently to thoroughly coat each piece, then let them sit while you preheat the grill — about 15 minutes is ideal to help the flavors meld.

Step 4: Preheat your grill to medium heat, aiming for a range around 400 to 450 degrees Fahrenheit. This temperature is perfect for getting beautiful grill marks without burning the vegetables.

Step 5: Shake off excess marinade from the squash slices before placing them on the grill. Position them perpendicular to the grill grates to avoid slipping through. Keep the grill lid open so they char nicely rather than steaming.

Step 6: Grill the squash for 2 to 3 minutes on each side until tender and marked with grill lines. Keep an eye on them to prevent overcooking and drying out.

Step 7: Transfer the grilled zucchini and yellow squash to a serving platter. Drizzle any reserved marinade over the top and sprinkle with additional salt if needed. Garnish with fresh herbs for an extra burst of color and flavor if you like.

Servings and Timing

This recipe generously serves 6 people, making it great for sharing at family dinners or gatherings. Prep is very quick — about 5 minutes to slice and mix your marinade, and then a 15-minute rest while the grill heats up to let the flavors soak in. The actual cooking time on the grill is short, around 4 to 6 minutes. In total, you’re looking at approximately 20 minutes from start to finish, with no extra cooling or resting time required before serving.

How to Serve This Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe

The image shows four halves of two types of fresh squash placed on a white cutting board set against a white marbled surface. On the left side are two long, smooth yellow squash halves with soft pale yellow interiors and small seeds in the center. To the right, two long green zucchini halves with dark green skin and light greenish-yellow flesh are arranged parallel to the yellow squash. A knife with a black handle lies near the lower left corner next to a gray and white striped cloth. The scene is brightly lit, highlighting the fresh textures and colors of the squash photo taken with an iphone --ar 4:5 --v 7

I love serving these grilled vegetables warm, straight off the grill so you can enjoy the char’s smoky aroma. They make a fantastic side dish alongside grilled chicken, steak, or fish, adding a fresh, tangy counterpoint to richer proteins. For a complete vegetarian meal, I often pair them with a grain salad or a hearty quinoa pilaf.

Presentation-wise, arranging the slices neatly in overlapping rows on a bright, rustic platter with little sprigs of fresh thyme or parsley makes the dish look so inviting. Drizzling a bit of good-quality olive oil or a squeeze of fresh lemon juice right before serving amps up the freshness and adds a glimmer that makes it pop.

When it comes to beverages, a crisp white wine like Sauvignon Blanc or a light rosé pairs beautifully, cutting through the richness of the marinade while highlighting the garden-fresh vibes. For non-alcoholic options, I enjoy pairing this with sparkling water infused with cucumber or a chilled herbal iced tea, especially for casual summer meals and weekend barbecues.

Variations

If you want to switch it up, I’ve found that substituting fresh herbs like rosemary or oregano instead of thyme brings lovely new layers of flavor without losing the dish’s brightness. Feeling adventurous? Try adding a splash of balsamic vinegar or lemon juice to the marinade for extra tang. You can also swap out crushed red pepper flakes for smoked paprika or a pinch of cayenne to vary the heat profile.

For those following gluten-free or vegan diets, this recipe is naturally suited since it’s free from gluten, dairy, and animal products. For a richer texture, sometimes I add a sprinkle of nutritional yeast or vegan parmesan as a finishing touch. If you don’t have access to a grill, you can get great results by using a grill pan or broiling the vegetable slices in your oven, keeping a close eye to avoid burning.

I’ve even grilled a medley of other summer squash like pattypan or added thin slices of eggplant and bell pepper for a colorful veggie platter perfect for sharing. The flexibility of this recipe is one of the reasons I keep coming back to it.

Storage and Reheating

Storing Leftovers

If you have any leftovers, I recommend storing them in an airtight container in the refrigerator. They will keep well for up to 3 days. I find glass containers with tight-fitting lids work best to maintain freshness and prevent any moisture buildup that can make the veggies soggy. Be sure to separate any extra marinade from the grilled vegetables if you prefer to keep them crisp.

Freezing

While I don’t typically freeze grilled zucchini and yellow squash, you can if needed. To do so, let the vegetables cool completely, then arrange them in a single layer on a baking sheet and freeze until solid. Transfer to freezer-safe bags or containers and keep for up to 2 months. Keep in mind that freezing may soften the texture after thawing, so I tend to use frozen grilled squash in cooked dishes like soups or stews rather than enjoying them as a standalone side.

Reheating

The best way to reheat leftover grilled zucchini and yellow squash is on a skillet over medium heat or briefly under the broiler, just enough to warm them through and revive some of the charred flavor. Avoid microwaving if possible, as it can make the vegetables watery and limp. Adding a little fresh drizzle of olive oil or a squeeze of lemon juice after reheating helps brighten the flavors back up.

FAQs

Can I use other types of squash for this recipe?

Absolutely! While zucchini and yellow squash are classic choices, other summer squash varieties like pattypan or straightneck also work wonderfully. You can even mix in slices of eggplant or bell pepper for a more diverse veggie platter.

Do I need to peel the zucchini and yellow squash?

I usually leave the skins on because they add texture, color, and nutrients. The thin skins grill nicely and hold up during cooking. Just be sure to wash the veggies thoroughly before slicing.

Can I prepare the marinade ahead of time?

Yes! The marinade can be whisked together a day in advance and stored in the fridge. Just give it a quick stir before tossing with the veggies. Marinating the squash for about 15 minutes before grilling is perfect to infuse flavor without making the vegetables too soft.

What if I don’t have a grill? Can I cook this indoors?

Definitely. If you don’t have access to an outdoor grill, a grill pan on the stovetop or broiling in the oven works well. The goal is to get nice char marks and slightly caramelize the veggies without steaming them.

Is this recipe suitable for meal prep?

Yes, it’s great for meal prepping! You can grill the vegetables ahead, store them in the fridge, and enjoy cold or reheated throughout the week. They maintain their flavor and texture nicely when stored properly.

Conclusion

I truly hope you give this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe a try soon. It’s one of those dishes that’s so simple yet so satisfying, perfect for showcasing fresh summer produce with a punch of flavor. Whether you’re making it for your family, a gathering, or just a cozy weeknight meal, I promise it will earn a top spot in your recipe rotation. Happy grilling!

Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe

Why You'll Love This Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe