Preheat oven to 350°. Bake nuts in a single layer in a shallow pan for 6 to 8 minutes or until toasted and fragrant.
Place greens in a large bowl. Add orange sections, grapefruit sections, sliced pear, and grapes. Drizzle with 1/4 cup Orange Vinaigrette, tossing gently to coat. Sprinkle toasted nuts over salad, and serve immediately with remaining vinaigrette.