Starbucks Happy Hour June 20, 2018 by SMFM Leave a Comment Don't Miss a deal! Sign up for our Daily Free Email HERE! Join us on Facebook HERE and our Facebook Group. Sign up for Starbucks Happy Hour to get $3 Grande Frappuccino Beverages from 3 p.m. until close on Thursday, June 21, 2018! It’s a party & you’re invited 3 p.m. until close Thursday, June 21, 2018!