The drink - known by fans as the PSL - is available to everyone else from September 6.
To order the plant-based version, customers need to request almond or coconut milk instead of dairy, and lose the whipped cream topping. Previously, the syrup contained condensed milk, but the coffee giant has reformulated it to make it vegan-friendly.
Vegan in Europe
The launch follows Starbucks adding a number of vegan menu items - including cupcakes, bagels, and cookies - to its menu in response to rapidly growing demand for plant-based options.
At an investors meeting in June, CEO Kevin Johnson said: "Plant-based beverages, plant-based proteins are a choice that many consumers are gravitating towards."