Preheat grill for medium heat and lightly oil the grate.
Arrange asparagus, zucchini, yellow squash, red onion and red bell peppers on preheated grill.
Cook until vegetables are tender and slightly charred, 10 to 15 minutes.
Remove vegetables from grill and cut into bite-sized pieces.
Toss vegetables with Terrapin Ridge Farms Dijon Mustard Vinaigrette.
Serve warm or at room temperature.