Sonic is celebrating St. Patrick’s Day this year with the introduction of the new Sour Shamrock Slush at participating locations starting March 2, 2026.
The new Sour Shamrock Slush features a tangy green apple–flavored slush blended with sour popping candy, topped with fluffy whipped topping and finished with an extra sprinkle of sour popping candy and a tart rainbow candy strip.
Clocking in at 440 calories per serving, the vibrant green slush is only available in a 20-ounce cup and carries a suggested price of $3.99 (may vary).
The Sour Shamrock Slush is available at participating Sonic locations nationwide for a limited time now through the end of March 2026.
