Preheat the oven to 350 degrees F (175 degrees C).

Arrange pecans on a baking sheet in a single layer.

Toast in the preheated oven until pecans just begin to darken, 7 to 10 minutes. Set aside to cool.

Slice peaches into bite-sized segments.

Combine peaches, spinach, and toasted pecans in a large bowl; toss with desired amount of dressing until evenly coated.