“Sweet 16” usually means a few different things, but the most common answer is: it’s the 16th birthday celebration , often called a “sweet sixteen.” In another common use, it refers to the NCAA basketball tournament round with 16 teams left.

Most common meaning

  • Birthday: a sweet 16 is typically celebrated when someone turns 16.
  • Basketball: the Sweet 16 is the NCAA tournament round that happens after the Round of 32.

If you meant the basketball event

For the 2025 men’s NCAA tournament, the Sweet 16 was held on Thursday, March 27 and Friday, March 28.

If you meant a birthday

A sweet 16 is simply on the person’s 16th birthday. It’s a milestone birthday, so the exact date depends on the person’s birth date.

Bottom line

If you mean the birthday , it’s at age 16. If you mean March Madness , it’s the tournament round of 16 teams, and in 2025 it was played March 27–28.