To hang Christmas lights on stucco, you will need to use plastic clips that are specifically designed to grip the texture of stucco. First, wipe the stucco surface with a damp cloth to remove any dust or debris. Then, attach the clips to the stucco using a small nail or screw, making sure to push the clips in firmly. Finally, attach the lights to the clips using the built-in hooks. If your stucco has a rough texture, you may need to use more than one clip per light strand.