McDonald’s Revives Uncle O’Grimacey to Celebrate Shamrock Shake and Charity Milestone

The seasonal Shamrock Shake returns February 10, with proceeds supporting Ronald McDonald House Charities’ 50th anniversary.

McDonald’s is reintroducing Uncle O’Grimacey, a mascot last seen in the 1980s, to promote the return of the Shamrock Shake.
The Shamrock Shake, a mint-flavored seasonal treat, will be available at participating locations from February 10 to March 23.
For every Shamrock Shake sold during this period, McDonald’s will donate 25 cents to Ronald McDonald House Charities, aiming to raise $5 million for families in need.
Uncle O’Grimacey’s return includes a line of themed merchandise, with additional donations from sales supporting the charity.
This campaign builds on McDonald’s strategy of leveraging nostalgic mascots, following the success of Grimace’s viral resurgence in 2023.