Place bacon in a large skillet and cook over medium-high heat, turning occasionally, until evenly browned, about 10 minutes. Drain bacon slices on paper towels; crumble.

Preheat oven to 400 degrees F (205 degrees C). Place a piece of aluminum foil over a baking sheet; spread fries in a single layer on baking sheet.Bake in preheated oven until golden brown and crisp, 15 to 20 minutes.

Preheat broiler.Sprinkle fries with cheese and crumbled bacon.Broil until cheese is melted, 1 to 2 minutes. Serve with Ranch dressing.