The Only Fall Starbucks Drink You Can Order As A Trenta - Tasting Table
Briefly

When ordering through the app or website, you can only get a Pumpkin Cream Cold Brew in a trenta size, highlighting Starbucks' restriction on larger sizes for certain drinks.
Starbucks does not advertise its trenta size, possibly because larger creations become increasingly expensive, discouraging customers from opting for an even pricier cup.
Baristas may be prohibited from making espresso-based drinks in trenta cups over concerns that the taste will be negatively affected, affecting the drink's flavor quality.
To get fall flavors in a trenta size, customers can add apple brown sugar, cinnamon dolce, or pumpkin sauce to any cold brew or iced coffee.
Read at Tasting Table
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