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| World Series championship seasons: none |
| Last World Series championship: none in 49 seasons |
| Best finish: |
| lost to Cleveland in AL Championship Series in 1995 season |
| lost to NY Yankees in AL Championship Series in 2000 season |
| lost to NY Yankees in AL Championship Series in 2001 season |
| lost to Toronto in AL Championship Series in 2025 season |
| TEAM | SEASON | RECORD | PERC | DIV STAND | GB | LEAGUE | PLAYOFFS |
| Seattle | 1977 | 64-98 | .395 | 6th AL West | -38.0 | ||
| Seattle | 1978 | 56-104 | .350 | 7th AL West | -35.0 | ||
| Seattle | 1979 | 67-95 | .414 | 6th AL West | -21.0 | ||
| Seattle | 1980 | 59-103 | .364 | 7th AL West | -38.0 | ||
| Seattle | 1981a | 21-36 | .368 | 6th AL West | -14.5 | ||
| Seattle | 1981b | 23-29 | .442 | 5th AL West | - 6.5 | ||
| Seattle | 1982 | 76-86 | .469 | 4th AL West | -17.0 | ||
| Seattle | 1983 | 60-102 | .370 | 7th AL West | -39.0 | ||
| Seattle | 1984 | 74-88 | .457 | T5th AL West | -10.0 | ||
| Seattle | 1985 | 74-88 | .457 | 6th AL West | -17.0 | ||
| Seattle | 1986 | 67-95 | .414 | 7th AL West | -25.0 | ||
| Seattle | 1987 | 78-84 | .481 | 4th AL West | - 7.0 | ||
| Seattle | 1988 | 68-93 | .422 | 7th AL West | -35.5 | ||
| Seattle | 1989 | 73-89 | .451 | 6th AL West | -26.0 | ||
| Seattle | 1990 | 77-85 | .475 | 5th AL West | -26.0 | ||
| Seattle | 1991 | 83-79 | .512 | 5th AL West | -12.0 | ||
| Seattle | 1992 | 64-98 | .395 | 7th AL West | -32.0 | ||
| Seattle | 1993 | 82-80 | .506 | 4th AL West | -12.0 | ||
| Seattle | 1994 | 49-63 | .438 | 3rd AL West | - 2.0 | 13th AL | |
| Seattle | 1995 | 79-66 | .545 | 1st AL West | + 1.0 | 4th AL | WNYY LCle |
| Seattle | 1996 | 85-76 | .528 | 2nd AL West | - 4.5 | 5th AL | |
| Seattle | 1997 | 90-72 | .556 | 1st AL West | + 6.0 | 3rd AL | LBal |
| Seattle | 1998 | 76-85 | .472 | 3rd AL West | -11.5 | 9th AL | |
| Seattle | 1999 | 79-83 | .488 | 3rd AL West | -16.0 | 7th AL | |
| Seattle | 2000 | 91-71 | .562 | 2nd AL West | - 0.5 | 3rd AL | WChW LNYY |
| Seattle | 2001 | 116-46 | .716 | 1st AL West | +14.0 | 1st AL | WCle LNYY |
| Seattle | 2002 | 93-69 | .574 | 3rd AL West | -10.0 | T5th AL | |
| Seattle | 2003 | 93-69 | .574 | 2nd AL West | - 3.0 | 4th AL | |
| Seattle | 2004 | 63-99 | .389 | 4th AL West | -29.0 | 13th AL | |
| Seattle | 2005 | 69-93 | .426 | 4th AL West | -26.0 | 12th AL | |
| Seattle | 2006 | 78-84 | .481 | 4th AL West | -15.0 | T10th AL | |
| Seattle | 2007 | 88-74 | .543 | 2nd AL West | - 6.0 | T5th AL | |
| Seattle | 2008 | 61-101 | .377 | 4th AL West | -39.0 | 14th AL | |
| Seattle | 2009 | 85-77 | .525 | 3rd AL West | -12.0 | 7th AL | |
| Seattle | 2010 | 61-101 | .377 | 4th AL West | -29.0 | 16th AL | |
| Seattle | 2011 | 67-95 | .414 | 4th AL West | -29.0 | 13th AL | |
| Seattle | 2012 | 75-87 | .463 | 4th AL West | -19.0 | 9th AL | |
| Seattle | 2013 | 71-91 | .438 | 4th AL West | -25.0 | 12th AL | |
| Seattle | 2014 | 87-75 | .537 | 3rd AL West | -11.0 | 6th AL | |
| Seattle | 2015 | 76-86 | .469 | 4th AL West | -12.0 | T12th AL | |
| Seattle | 2016 | 86-76 | .531 | 2nd AL West | - 9.0 | 7th AL | |
| Seattle | 2017 | 86-76 | .531 | T3rd AL West | -23.0 | T9th AL | |
| Seattle | 2018 | 89-73 | .549 | 3rd AL West | -14.0 | 7th AL | |
| Seattle | 2019 | 68-94 | .420 | 5th AL West | -39.0 | 11th AL | |
| Seattle | 2020 | 27-33 | .450 | 3rd AL West | - 9.0 | 9th AL | |
| Seattle | 2021 | 90-72 | .556 | 2nd AL West | - 5.0 | 7th AL | |
| Seattle | 2022 | 90-72 | .556 | 2nd AL West | -16.0 | 5th AL | WTor LHou |
| Seattle | 2023 | 88-74 | .543 | 3rd AL West | - 2.0 | 7th AL | |
| Seattle | 2024 | 85-77 | .525 | 2nd AL West | - 3.5 | 7th AL | |
| Seattle | 2025 | 90-72 | .556 | 1st AL West | + 3.0 | 2nd AL | bye WDet LTor |