IN BLANKSTARE NEWS: The return of the Shamrock Shake at McDonald's.

St. Patrick's Day ... and the return of the Shamrock Shake at McDonald locations will start selling the green concoction on February 20th along with the newer Oreo Shamrock McFlurry.

With Valentine's Day less than a week away, it's time to start thinking about St. Patrick's Day ... and the return of the Shamrock Shake at McDonald's. The fast-food giant says that their locations will start selling the green concoction on February 20th along with the newer Oreo Shamrock McFlurry. The Shamrock Shake was introduced by McDonald's back in 1970.