Name: Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe
Prep time: 15 min
Cook time: 5 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

Jump to Recipe· 3.9 from 5 reviews

I absolutely adore fresh, flavorful vegetables, and this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe has become one of my all-time favorites to whip up when summer rolls around. The bright tanginess of the Dijon marinade paired with perfectly grilled summer squash creates such a satisfying, easy dish that feels both light and indulgent at the same time. Every time I make it, I’m reminded how simple ingredients can really shine on the grill, and it’s so fun to serve this colorful plate to friends and family.

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

What draws me back to this grilled zucchini and yellow squash dish is the fantastic balance of flavors. The Dijon mustard marinade lends a zesty, slightly spicy kick that wonderfully complements the natural sweetness and earthiness of the squash. I love how the garlic and thyme add depth without overpowering the fresh produce. When grilled just right, the vegetables develop those enticing char marks and a beautiful smoky aroma that makes every bite memorable.

Aside from the delicious flavor, the ease of making this recipe is a huge plus for me. It takes almost no time to prepare and comes together seamlessly while your grill heats up. This makes it perfect for last-minute cookouts, casual weeknight dinners, or even elegant summer parties where you want something fresh yet impressive. It stands out because it’s not just a side dish but a celebration of simple ingredients done really well, which is why I always recommend this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe to anyone looking for a fuss-free grilled vegetable option.

Ingredients You’ll Need

The image shows a white cutting board placed on a white marbled surface with a striped cloth and serrated knife nearby. On the board are two yellow squash and two green zucchini, each sliced lengthwise into halves. The yellow squash halves display a pale yellow inside with small seeds in the center, and their bright yellow skin edges curve gently. The zucchini halves show a light green, slightly textured inner flesh with white seeds and a dark green skin border. The slices are lined up in two pairs with the cut sides facing upward, highlighting the smooth, fresh texture of both vegetables. photo taken with an iphone --ar 4:5 --v 7

The magic of this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe lies in its simplicity. Each ingredient plays a crucial role in creating a perfect balance of taste, texture, and color that highlights the natural freshness of the squash. Here’s what you’ll need to bring this quick side to life:

2 medium sized zucchini: Choose fresh, firm zucchini with smooth skin for the best grilling texture.
2 medium sized yellow squash: Their bright color adds a lovely visual contrast and sweet flavor.
¼ cup extra-virgin olive oil: This helps the marinade cling to the vegetables and adds richness.
1 Tablespoon Dijon mustard: The key ingredient for that tangy, sharp marinade base.
1 teaspoon finely minced garlic: Gives a subtle pungency that enhances the overall aroma.
1 teaspoon dried thyme: Offers a gentle herbal note that pairs beautifully with the squash.
½ teaspoon kosher salt: Balances all the flavors and amplifies the vegetables’ natural sweetness.
¼ teaspoon black pepper: Adds just a hint of warmth.
¼ teaspoon crushed red pepper flakes: For a subtle spicy kick that wakes up the palate without overwhelming.

Directions

Step 1: Start by slicing both the zucchini and yellow squash lengthwise into strips between ¼ and ½-inch thick. I like this thickness because it grills quickly but still holds a satisfying bite without falling apart.

Step 2: In a large bowl, whisk together the extra-virgin olive oil, Dijon mustard, minced garlic, dried thyme, kosher salt, black pepper, and crushed red pepper flakes to create your delicious marinade. The mustard and oil form an emulsified dressing that coats the zucchini and squash perfectly.

Step 3: Toss the sliced vegetables gently in the marinade, making sure every piece is evenly coated. Let them sit and soak up these flavors for about 15 minutes while you preheat your grill to medium heat, around 400 to 450 degrees Fahrenheit.

Step 4: Once your grill is hot, place the zucchini and squash strips perpendicular to the grill grates to prevent slipping through. Shake off excess marinade first so you don’t get too much smoke flare. Grill the vegetables for 2 to 3 minutes on each side, keeping the grill lid open so they char nicely without steaming.

Step 5: Transfer the grilled vegetables to a platter and drizzle them with the reserved marinade for an extra flavor boost. Taste and adjust seasoning with a little more salt if needed. I love to finish mine with a sprinkle of fresh herbs or cracked black pepper for added freshness and presentation.

Servings and Timing

This Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe serves about 6 people, making it a great side for small gatherings or family meals.

The prep time is roughly 15 minutes, including slicing the vegetables and mixing the marinade. The cook time on the grill is quick, only about 5 minutes total since the strips are thin and grill fast. Altogether, you’re looking at just 20 minutes total from start to finish, including marinating while the grill heats up. There is no additional resting time necessary, so you can serve these vibrant veggies immediately and enjoy them warm or at room temperature.

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

The image shows a white plate with grilled zucchini and yellow squash slices layered side by side, each slice long, thin, and slightly charred with brown grill marks. The green and yellow colors of the vegetables contrast with white crumbles of cheese scattered on top. Bright green basil leaves are spread across the vegetables adding freshness to the dish. The plate sits on a white marbled surface with a gray and white striped cloth in the background. photo taken with an iphone --ar 4:5 --v 7

I love serving this grilled vegetable dish as a versatile side that pairs beautifully with a variety of mains. It works exceptionally well alongside grilled chicken or fish, where the light tang and smoky notes complement rather than compete with the protein. For a casual summer gathering, it’s a welcome addition to skewers, burgers, or even a picnic spread. You can also toss it into a grain bowl or salad for extra texture and flavor.

For presentation, I like to arrange the grilled zucchini and yellow squash slices on a large, colorful platter. Drizzling the leftover marinade over the veggies adds a glossy finish that makes them look even more appetizing. Fresh herbs, such as chopped parsley or basil, add a vibrant touch and a pop of green that elevates the dish’s appearance. Serving in moderate portions is perfect—around 3 to 4 slices per person as a side dish.

When it comes to beverages, this recipe shines with a crisp white wine like Sauvignon Blanc or Pinot Grigio, which complement the herbaceous notes and mustard’s brightness. For a non-alcoholic option, I enjoy sparkling water with lemon or a light iced green tea. Because the vegetables taste great warm or at room temperature, this dish is super flexible for buffet-style meals or plated dinners alike, and it truly shines during weekend barbecues, holiday cookouts, or family dinners alike.

Variations

I love experimenting with this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe by swapping out a few ingredients or trying different cooking methods to suit my mood and dietary preferences. For example, if you want a slightly sweeter and milder marinade, try substituting honey or maple syrup for a hint of natural sweetness alongside the Dijon. For a more herbaceous punch, fresh thyme or rosemary can replace dried herbs, offering a fragrant twist.

If you need a gluten-free or vegan option, you’re already in luck since this recipe is naturally both. Just be sure your Dijon mustard doesn’t contain any gluten additives—most do not, but it’s good to check the label! To add more depth, I sometimes sprinkle nutritional yeast over the grilled veggies before serving for a cheesy, savory note without dairy.

While grilling is my favorite method, you can also cook the squash on a grill pan indoors or roast it in the oven at a high temperature (425°F) for about 12-15 minutes, flipping halfway to get caramelized edges. Each method brings out slightly different textures and flavors, so I encourage you to try them all and see which you prefer for your own version of this classic recipe.

Storage and Reheating

Storing Leftovers

After enjoying this grilled zucchini and yellow squash, you can store leftovers in an airtight container in the refrigerator for up to 4 days. I prefer glass containers with tight-fitting lids because they keep the veggies fresh without absorbing other fridge odors. Make sure the vegetables have cooled completely before sealing the container to avoid condensation and sogginess.

Freezing

Because of the high water content of zucchini and yellow squash, freezing is generally not recommended for this dish if you want to keep the same fresh texture. The vegetables can become mushy and watery after thawing. However, if you need to freeze it, it’s best to do so quickly in portioned freezer-safe bags, removing as much air as possible, and consume within 1 to 2 months. Thaw overnight in the fridge and expect a softer texture upon reheating.

Reheating

To enjoy leftovers, I find reheating gently on the stove over medium-low heat is best to preserve the texture and prevent sogginess. Alternatively, a quick zap in the microwave works if you’re short on time—cover loosely to maintain moisture. Avoid reheating too long or at high heat to prevent the vegetables from becoming mushy or drying out. Adding a small drizzle of olive oil or a splash of fresh lemon juice after reheating can revive the flavors nicely.

FAQs

Can I use other types of squash in this recipe?

Absolutely! While zucchini and yellow squash are classic choices, you can experiment with pattypan squash, crookneck squash, or even thicker slices of eggplant. Just be mindful of cooking times, as denser vegetables may need a bit longer on the grill to soften properly.

Do I have to use Dijon mustard in the marinade?

Dijon mustard is key to achieving that signature tangy and creamy texture in the marinade, but if you don’t have it on hand, you can try whole grain mustard or even a mild yellow mustard. Keep in mind the flavor will be less sharp, so adjusting the seasoning by adding a splash of vinegar or lemon juice can help brighten the dish.

Is it possible to make this recipe vegan and gluten-free?

Yes, this recipe is naturally vegan and gluten-free as long as the Dijon mustard you use doesn’t contain gluten additives. The simple olive oil, herbs, and spices create a flavorful marinade that suits a variety of dietary needs.

How do I prevent the squash from slipping through the grill grates?

I recommend slicing the zucchini and yellow squash lengthwise into strips and placing them perpendicular to the grill grates so they don’t fall through. Alternatively, you can cut them into rounds and use a grill basket for easier handling.

Can I prepare the marinade ahead of time?

Definitely! Making the marinade ahead is a great way to save time on grilling day. You can whisk the marinade ingredients together and store them in the refrigerator for up to 2 days. Just bring it to room temperature before tossing with the vegetables to get the best flavor and coating.

Conclusion

I truly hope you give this Grilled Zucchini and Yellow Squash with Dijon Marinade Recipe a try because it’s one of those dishes that feels special but comes together so effortlessly. It’s a fantastic way to celebrate simple, fresh summer produce with a zesty twist that’s sure to become a staple for backyard dinners and casual get-togethers. Happy grilling, and enjoy every vibrant, flavorful bite!