The Shamrock Shake was first introduced in 1970. Rogers Merchandising in Chicago created the shake. Initially, the shake was lemon/lime flavored with vanilla ice cream, lemon/lime sherbet, and vanilla syrup. By 1973, the shake was merely a green colored vanilla shake, eliminating the lemon/lime sherbet. It is now mint flavored.
During the 1980s, McDonald’s used the Uncle O'Grimacey character to market Shamrock Shakes, but has since phased it out.
In 1980, McDonald's introduced the Shamrock Sundae which consisted of vanilla ice cream topped with a mint green Shamrock syrup. The product was discontinued after one year due to poor sales.
- Huguenin, Patrick (2007-03-16). "Shamrock Shake Shocker: It's Disappeared!". The New York Daily News. p. 46. Archived from the original on 2009-03-16. Retrieved 2009-04-07.
- "Ultimate Shamrock Shake Guide". Gluttoner. Retrieved 18 October 2012.
- Associated Press (2012-02-08). "McDonald's offers Shamrock Shake nationally". Asheville Citizen-Times. Retrieved 2012-02-08.[dead link]