Free ice cream is easy to find on the first day of summer, but if you prefer to cool down with something caffeinated, head to Starbucks. As Thrillist reports, the coffee chain is celebrating summer solstice by offering buy-one-get-one espresso drinks and Frappuccinos for happy hour on Thursday, June 20.

Starbucks's Frappuccinos are blended frozen coffee drinks topped with whipped cream and flavored syrups. From 3 p.m. to closing time on Thursday at participating Starbucks, customers who order a Frappuccino size grande or larger will receive a second one of any flavor for free. The deal also applies to espresso-based drinks like lattes, cappuccinos, and Americanos.

To snag your free happy hour drink, download the free Starbucks app to your mobile phone. The BOGO deal will be waiting in your inbox when you open it—just show it to your cashier when ordering your drinks.

Starbucks offers over a dozen Frappuccino flavors, like caramel, chocolate cookie, and matcha green tea. If you live in certain parts of the world, you may have access to even more Frappuccino flavors like hojicha and dulce de leche. Here are some more unexpected Starbucks menu items from around the world.

[h/t Thrillist]