Zest 2 blood oranges and juice 1 blood orange. Combine zest, juice, rice vinegar, oil, honey, jalapeno, and mustard in a blender. Blend dressing until smooth and season with salt and black pepper. Set aside.
Peel and remove pith from remaining 2 blood oranges and slice horizontally.
Divide spinach evenly among 4 salad plates. Divide sliced blood orange evenly over spinach. Top salad with pomegranate arils, pecans, bacon, and feta cheese. Drizzle each salad evenly with vinaigrette and serve immediately.