Want to try a Frappuccino without committing to a full-size beverage? Starbucks has announced that it's offering new Mini Frappuccinos for a limited time only! The new Mini Frappuccino is 10 ounces, which is two ounces smaller than the tall-sized Frappuccino. They will be available at participating Starbucks stores in the U.S. and Canada from May 11th through July 6th.