This post is a basic timeline of the Seattle Mariners. There are 40 events listed below chronologically.
- 1977: First season
- 1979: Host All-Star Game
- 1984: Alvin Davis receives AL Rookie of the Year
- 1987: Ken Griffey Jr. is drafted first overall in the MLB draft
- 1989: Ken Griffey Jr. rookie season
- 1989: Randy Johnson joins the Mariners
- 1990: Randy Johnson throws no-hitter
- 1991: First winning season (83-79)
- 1992: Nintendo chairman Hiroshi Yamauchi becomes majority owner
- 1993: Lou Piniella becomes manager
- 1993: Chris Bosio throws no-hitter
- 1995: First playoff appearance and division title
- 1995: Edgar Martinez hits game-winning double to win ALDS against the New York Yankees (lose to Cleveland Indians in ALCS)
- 1996: Alex Rodriguez rookie season
- 1997: Second playoff appearance and division title (lose to Baltimore Orioles in ALDS)
- 1998: Randy Johnson is traded to the Houston Astros
- 1999: Kingdome is demolished
- 1999: Safeco Field (T-Mobile Park) opens
- 2000: Ken Griffey Jr. leaves the Mariners and signs with the Cincinnati Reds
- 2000: Kazuhiro Sasaki receives AL Rookie of the Year
- 2000: Third playoff appearance and wild card (lose to New York Yankees in ALCS)
- 2001: Alex Rodriguez leaves the Mariners and signs with the Texas Rangers
- 2001: Host All-Star Game
- 2001: Tie single season record for wins in a season (116-46 record)
- 2001: Fourth playoff appearance and division title
- 2001: Ichiro Suzuki receives AL Rookie of the Year and AL MVP
- 2003: Lou Piniella leaves the Mariners and signs with the Tampa Bay Devil Rays
- 2004: Ichiro Suzuki breaks the single season hit record (257 hits)
- 2005: Felix Hernandez rookie season
- 2009: Ken Griffey Jr. returns to the Mariners
- 2010: Ken Griffey Jr. retires
- 2010: Felix Hernandez receives AL Cy Young Award
- 2012: Ichiro Suzuki is traded to the New York Yankees
- 2012: 6 player combined no-hitter (Kevin Millwood, Charlie Furbush, Stephen Pryor, Lucas Luetge, Brandon League, Tom Wilhelmsen)
- 2012: Felix Hernandez throws perfect game
- 2015: Hisashi Iwakuma throws no-hitter
- 2018: James Paxton throws no-hitter
- 2019: Ichiro Suzuki returns to the Mariners
- 2019: Ichiro Suzuki retires
- 2021: Kyle Lewis receives AL Rookie of the Year
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