Great question, coffee friend. The answer is basically identical. Hot or iced, a Grande still hovers around 120 calories. The only difference is the ice takes up space, so you get less actual latte liquid. But the calorie count? Same.
Skinny Vanilla Latte: Secret Starbucks Nutritional Value Exposed
So pick your temperature based on your mood, not your math. Feeling frosty? Go iced. Need a warm blanket in a cup? Hot it is.