Comments Shamrock Shakes will be making their grand return to McDonald's on February 15, just a month before St. Patrick's Day. It's official! McDonald's Shamrock Shake will be released in the United States on February 15, 2021, a full month out from St. Patrick's Day, March 17. ðððð ð ð                    ðððð                      ð                  ð    ððððhamrock Shake is back on 2.15 â McDonald's (@McDonalds) February 2, 2021 All those lovers of the green vanilla holiday treat are in luck! This year the Shamrock Shake will also be joined by the Oreo Shamrock McFlurry. âFor more than 50 years, fans have eagerly awaited the annual return of the Shamrock Shake, counting on the arrival of Shamrock Shake Season to mark the unofficial start to spring,â said McDonaldâs Sr. Director of Culinary, Chad Schafer.