Overview
- The seasonal desserts hit participating U.S. menus on Feb. 17, with no end date announced.
- Availability varies by location and the items are offered only for a limited run.
- McDonald’s lists the Shamrock Shake at 500 calories (small), 540 (medium) and 800 (large), with the Oreo Shamrock McFlurry at 460 calories.
- The shake blends vanilla soft serve with mint Shamrock syrup and whipped topping; the McFlurry adds Oreo cookie pieces.
- The tradition dates to a 1967 creation by franchisee Hal Rosen, a 1970 regional debut, nationwide rollout in 2012, and an Oreo variant introduced in 2020.