If you're starting with fresh corn, boil or steam until tender, about 3-5 minutes. If starting with frozen corn, thaw, drain, and let stand until it comes to room temperature.
Combine all dressing ingredients in a jar. Cover with lid and shake until completely combined. Set aside.
2 tablespoons extra-virgin olive oil, 1 tablespoon honey, 1 tablespoon apple cider vinegar, 1 teaspoon kosher salt
Place all of the vegetables in a large bowl.
2 cups corn kernels, 1 cup halved grape tomatoes, 1 cup diced zucchini, ½ cup diced celery, ½ cup diced sweet bell pepper, ¼ cup diced red onion
Pour dressing over top and gently toss to coat.
Cover and refrigerate until ready to serve.