Costco launches green mint shake for St. Patrick’s Day, challenging McDonald’s Shamrock Shake.

Costco has introduced a new green-colored shake in its food courts, timed to coincide with St. Patrick’s Day, as a direct competitor to McDonald’s Shamrock Shake. The limited-time offering features a sweet, minty flavor and is available for a short period, aiming to attract customers looking for a festive treat. The move marks Costco’s latest effort to expand its food court menu with seasonal items that challenge fast-food staples.