 South Carolina, Tennessee, Kentucky, Michigan, and it kicks off this January in Texas. Jimmy Alexander, WTOP News. 507, you scream, I scream, we all scream for ice cream, especially today because it is National Ice Cream Day. Not an official holiday, though many think it ought to be. President Ronald Reagan formally proclaimed the third Sunday in July as National Ice Cream Day in 1984. Several local ice creamers will be holding special events to mark the occasion.