Set a skillet over medium heat. Add the bacon and cook until crispy, about 5-6 minutes. Transfer to a paper towel-lined plate to cool a little while you prepare the rest of the ingredients.
In a small container, add the shallot, oil, maple syrup and vinegar and season with salt and pepper. Seal well and shake vigorously until combined.
In a large bowl, combine the spinach and half the dressing. Toss until the spinach is coated to your liking (you can add more dressing if you want).
On a serving platter or individual plates, place the spinach. Arrange peach, bacon, and feta on top, and drizzle with more dressing. Serve immediately.