The 2026 MLB Opening Day is Wednesday, March 25, 2026 for the first game, and Thursday, March 26, 2026 is the first day when most teams start; all 30 teams are in action by Saturday, March 28, 2026.

Quick scoop

  • First game: Yankees vs. Giants on Wednesday, March 25, 2026.
  • Most teams: Thursday, March 26, 2026.
  • All teams active: Saturday, March 28, 2026.

In plain English

Baseball’s “Opening Day” can mean the league’s first game, or the first full slate of games. In 2026, the season starts on March 25 , but the traditional main Opening Day for most clubs is March 26.

Tiny timeline

  1. March 25: Season opener.
  1. March 26: Biggest Opening Day slate.
  1. March 27: A few more teams begin.
  1. March 28: Every team has played its opener.

TL;DR: Opening Day for baseball is March 25, 2026, with the main league-wide slate on March 26.