The March Madness men’s bracket typically closes (locks) right before the first game of the main First Round tips off , and after that you can’t make edits or new picks.

Quick Scoop

  • For 2026, the men’s NCAA tournament First Four games begin on Tuesday, March 17, but most national bracket contests lock just before the first Thursday First Round game on March 19 in the early afternoon Eastern Time.
  • Once that opening tip happens for that first full-round game, your bracket is frozen—no changes, no late joiners for that pool.
  • Exact closing time can vary a bit by platform (ESPN, Yahoo, CBS, NCAA, etc.), but they all key off that same “first game of the round” rule.

What this means for you

  • Aim to have your bracket done no later than Wednesday night or very early Thursday morning local time so you’re not burned by last‑minute rush or site slowdowns.
  • If you’re joining an office or friends’ pool, that group usually follows the same deadline as the hosting site—when the bracket locks, the group locks too.

If you’re looking up “when does March Madness bracket close,” you’re really asking: “How late can I safely wait before the first Thursday game?” The safe play is to treat that as your hard cutoff and beat it by a few hours.

TL;DR: Brackets close when the first official tournament game for the round your pool uses (usually Thursday’s First Round) tips off; finish and submit your picks several hours before that.

Information gathered from public forums or data available on the internet and portrayed here.