Opening Day for the 2026 MLB season is Thursday, March 26, 2026.

The very first regular-season game, however, is a special Opening Night matchup on Wednesday, March 25, 2026 , when the New York Yankees play the San Francisco Giants at Oracle Park.

Quick Scoop

  • Official Opening Day: Thursday, March 26, 2026 (full slate of games, earliest “traditional” Opening Day ever).
  • First regular-season game: Yankees at Giants on Wednesday, March 25, 2026, in San Francisco.
  • All 30 teams in action: The league has a complete set of games across March 26–27 as part of Opening Week.

You can think of it this way: March 25 is the ceremonial Opening Night , but March 26 is the big Opening Day that most fans circle on the calendar.

TL;DR:

  • First MLB regular-season game in 2026: March 25 (Yankees vs. Giants).
  • Official MLB Opening Day 2026: March 26.

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