You know that moment when you roll up to McDonald’s dreaming of a Sausage McMuffin, only to find breakfast is already done for the day? It feels like you missed a tiny window of happiness. The big question is: what time does McDonald’s stop serving breakfast, and why does it end so early? The Short Answer: McDonald’s Breakfast Ends at 10:30 A.M. (Mostly) At most U.S. locations, breakfast is served until 10:30 a.m. on weekdays and 11:00 a.m. on weekends . That extra half-hour on Saturday and Sunday is McDonald’s way of accommodating late sleepers who still want a McGriddle with their coffee. Why Breakfast Has a Cutoff Time You might wonder why McDonald’s doesn’t just keep breakfast rolling all day. The reason is surprisingly practical: The grills can’t handle cooking both breakfast and lunch menus at the same time. Burgers, fries, and chicken sandwiches take up a different kind of cooking space. Lunch hours bring in higher sales, so the transition is all about efficiency...