59 Wins, 52 Losses
| Date | Game Type | Upset Magnitude | |||
|---|---|---|---|---|---|
| 12/02/86 | Lost | Mount Si 38 | Gig Harbor 43 | Non-league | 9.556 |
| 12/15/86 | Won | Mount Si 59 | Franklin 33 | Non-league | 2.665 |
| 12/29/86 | Lost | Mount Si 54 | White River 56 | Non-league | 8.527 |
| 01/02/87 | Won | Mount Si 50 | Inglemoor 30 | Non-league | 3.216 |
| 01/13/87 | Lost | Mount Si 49 | Enumclaw 55 | League | 8.458 |
| 02/06/87 | Lost | Mount Si 46 | Mount Rainier 50 | League | 7.244 |
| 01/03/89 | Won | Mount Si 50 | Fife 38 | Non-league | 2.855 |
| 02/17/89 | Won | Mount Si 53 | Liberty (Issaquah) 45 | Playoff | 7.992 |
| 01/23/90 | Won | Mount Si 34 | Renton 24 | League | 14.603 |
| 11/30/90 | Won | Mount Si 37 | Chief Sealth 35 | Non-league | 10.090 |
| 12/11/90 | Lost | Mount Si 43 | Mount Rainier 44 | League | 9.549 |
| 01/04/91 | Won | Mount Si W | Lindbergh L | League | 6.212 |
| 01/11/91 | Lost | Mount Si 29 | Tyee 32 | League | 6.274 |
| 01/12/91 | Won | Mount Si 46 | Evergreen (Highline) 38 | League | 4.167 |
| 02/01/91 | Won | Mount Si 36 | Lindbergh 34 | League | 6.212 |
| 02/05/91 | Won | Mount Si 51 | Hazen 50 | League | 22.350 |
| 02/08/91 | Lost | Mount Si 28 | Tyee 34 | League | 6.274 |
| 01/10/92 | Won | Mount Si 47 | Liberty (Issaquah) 46 | League | 16.072 |
| 02/14/92 | Lost | Mount Si 38 | Mount Rainier 54 | League | 0.626 |
| 02/18/92 | Won | Mount Si 34 | Highline 30 | League | 5.945 |
| 02/03/93 | Won | Mount Si 43 | Lindbergh 26 | League | 12.212 |
| 02/09/93 | Won | Mount Si 45 | Tyee 39 | League | 6.259 |
| 02/11/93 | Won | Mount Si 53 | Mount Rainier 49 | League | 0.208 |
| 02/16/93 | Lost | Mount Si 51 | Evergreen (Highline) 52 | League | 0.927 |
| 02/19/93 | Won | Mount Si 53 | Mount Rainier 34 | League | 0.208 |
| 12/14/93 | Lost | Mount Si 30 | Renton 32 | League | 25.766 |
| 01/07/94 | Lost | Mount Si 34 | Lindbergh 38 | League | 0.970 |
| 02/04/94 | Won | Mount Si 51 | Kennedy 43 | League | 20.779 |
| 02/17/94 | Won | Mount Si 40 | Tyee 36 | League | 4.671 |
| 12/16/94 | Lost | Mount Si 44 | Kennedy 48 | League | 4.555 |
| 01/13/95 | Lost | Mount Si 46 | Liberty (Issaquah) 48 | League | 5.748 |
| 02/11/95 | Lost | Mount Si 47 | Liberty (Issaquah) 59 | League | 5.748 |
| 02/25/95 | Won | Mount Si 61 | Roosevelt 59 | Playoff | 0.281 |
| 12/07/95 | Lost | Mount Si 42 | Kennedy 56 | Non-league | 3.996 |
| 12/28/95 | Lost | Mount Si 37 | Rogers (Puyallup) 53 | Non-league | 4.815 |
| 03/06/96 | Won | Mount Si 66 | Tahoma 57 | Playoff | 7.658 |
| 03/07/96 | Won | Mount Si 49 | Aberdeen 47 | Playoff | 5.333 |
| 03/01/97 | Won | Mount Si 59 | Kennedy 42 | Playoff | 0.676 |
| 12/05/97 | Lost | Mount Si 38 | Bellevue 48 | Non-league | 18.752 |
| 01/14/98 | Won | Mount Si 50 | Issaquah 37 | League | 3.258 |
| 01/21/98 | Lost | Mount Si 43 | Mercer Island 47 | League | 5.742 |
| 01/30/98 | Lost | Mount Si 38 | Liberty (Issaquah) 41 | League | 3.793 |
| 12/08/98 | Won | Mount Si 58 | Kennedy 54 | Non-league | 2.868 |
| 01/20/99 | Won | Mount Si 54 | Issaquah 51 | League | 3.013 |
| 02/10/99 | Lost | Mount Si 37 | Skyline 46 | League | 0.037 |
| 02/12/99 | Lost | Mount Si 38 | Sammamish 44 | League | 4.097 |
| 02/20/99 | Won | Mount Si 42 | Mercer Island 38 | Playoff | 9.412 |
| 02/23/99 | Won | Mount Si 59 | Kennedy 57 | Playoff | 2.868 |
| 12/01/99 | Won | Mount Si 56 | Eastlake 48 | Non-league | 4.711 |
| 01/26/00 | Won | Mount Si 38 | Skyline 32 | League | 11.826 |
| 02/02/00 | Won | Mount Si 44 | Cedarcrest 42 | League | 0.236 |
| 02/04/00 | Won | Mount Si 49 | Sammamish 47 | League | 5.798 |
| 12/08/00 | Won | Mount Si 57 | Sammamish 39 | League | 6.848 |
| 12/22/00 | Lost | Mount Si 38 | Eastlake 40 | Non-league | 0.139 |
| 01/19/01 | Lost | Mount Si 58 | Liberty (Issaquah) 59 | League | 9.854 |
| 01/31/01 | Lost | Mount Si 31 | Cedarcrest 32 | League | 3.717 |
| 12/07/01 | Won | Mount Si 43 | Newport (Bellevue) 37 | League | 3.187 |
| 01/16/02 | Lost | Mount Si 49 | Liberty (Issaquah) 57 | League | 2.172 |
| 01/18/02 | Won | Mount Si 42 | Newport (Bellevue) 38 | League | 3.187 |
| 01/23/02 | Lost | Mount Si 38 | Mercer Island 53 | League | 3.015 |
| 12/06/02 | Won | Mount Si 45 | Bothell 26 | Non-league | 1.736 |
| 01/15/03 | Won | Mount Si 61 | Skyline 60 | League | 5.507 |
| 12/17/03 | Won | Mount Si 51 | Newport (Bellevue) 30 | League | 2.089 |
| 01/30/04 | Lost | Mount Si 36 | Liberty (Issaquah) 60 | League | 9.676 |
| 02/04/05 | Won | Mount Si 50 | Newport (Bellevue) 43 | League | 1.407 |
| 02/11/05 | Won | Mount Si 60 | Bellevue 50 | Playoff | 6.475 |
| 02/02/06 | Won | Mount Si 69 | Newport (Bellevue) 61 | League | 0.398 |
| 02/09/06 | Won | Mount Si 64 | Newport (Bellevue) 45 | Playoff | 0.398 |
| 02/23/06 | Lost | Mount Si 40 | Seattle Prep 56 | Playoff | 0.225 |
| 12/01/06 | Won | Mount Si 65 | Skyline 58 | League | 14.605 |
| 02/20/07 | Won | Mount Si 54 | Bainbridge 51 | Playoff | 2.618 |
| 11/27/07 | Lost | Mount Si 39 | Nathan Hale 55 | Non-league | 2.441 |
| 12/05/07 | Lost | Mount Si 60 | Mercer Island 61 | League | 0.476 |
| 12/15/08 | Lost | Mount Si 53 | Cedarcrest 60 | Non-league | 11.435 |
| 02/10/09 | Won | Mount Si 40 | Bellevue 39 | League | 3.491 |
| 02/12/09 | Won | Mount Si 57 | Mercer Island 47 | League | 2.796 |
| 02/20/09 | Won | Mount Si 64 | Bellevue 52 | Playoff | 3.491 |
| 02/24/09 | Lost | Mount Si 37 | Nathan Hale 41 | Playoff | 1.621 |
| 11/30/09 | Lost | Mount Si 46 | Seattle Christian 55 | Non-league | 2.473 |
| 12/01/09 | Lost | Mount Si 46 | Puyallup 49 | Non-league | 3.666 |
| 12/09/09 | Lost | Mount Si 45 | Liberty (Issaquah) 60 | League | 5.828 |
| 12/19/09 | Won | Mount Si 47 | Port Angeles 39 | Non-league | 0.415 |
| 12/30/09 | Lost | Mount Si 46 | Nooksack Valley 47 | Non-league | 11.906 |
| 01/08/10 | Lost | Mount Si 46 | Juanita 49 | League | 2.598 |
| 02/09/10 | Won | Mount Si 57 | Bellevue 54 | League | 1.793 |
| 02/23/10 | Lost | Mount Si 53 | Nathan Hale 61 | Playoff | 5.330 |
| 12/17/10 | Lost | Mount Si 41 | Nathan Hale 43 | Non-league | 9.324 |
| 12/23/10 | Lost | Mount Si 50 | Lakeside (Seattle) 53 | Non-league | 2.835 |
| 12/29/10 | Won | Mount Si 53 | Lynnwood 40 | Non-league | 3.694 |
| 01/12/11 | Lost | Mount Si 36 | Liberty (Issaquah) 39 | League | 4.684 |
| 01/26/11 | Won | Mount Si 52 | Juanita 40 | League | 2.751 |
| 02/01/11 | Lost | Mount Si 33 | Bellevue 35 | League | 6.716 |
| 02/15/11 | Lost | Mount Si 43 | Seattle Prep 52 | Playoff | 0.474 |
| 01/04/12 | Won | Mount Si 47 | Bellevue 44 | League | 7.146 |
| 01/13/12 | Lost | Mount Si 43 | Mercer Island 47 | League | 5.431 |
| 02/03/12 | Won | Mount Si 54 | Lake Washington 44 | League | 4.280 |
| 02/05/14 | Won | Mount Si 43 | Sammamish 31 | League | 1.444 |
| 12/10/14 | Lost | Mount Si 41 | Redmond 57 | League | 3.373 |
| 12/03/16 | Lost | Mount Si 36 | Cedarcrest 46 | Non-league | 1.288 |
| 12/07/16 | Won | Mount Si 51 | Issaquah 44 | League | 5.416 |
| 01/03/18 | Won | Mount Si 58 | Skyline 55 | League | 13.784 |
| 01/13/18 | Lost | Mount Si 63 | North Creek 65 | League | 2.092 |
| 01/26/18 | Lost | Mount Si 51 | North Creek 56 | League | 2.092 |
| 12/15/18 | Won | Mount Si 56 | Issaquah 52 | League | 7.245 |
| 01/11/19 | Won | Mount Si 58 | Eastlake 52 | League | 21.897 |
| 01/18/19 | Lost | Mount Si 34 | Skyline 46 | League | 15.580 |
| 12/02/19 | Lost | Mount Si 50 | Tahoma 58 | Non-league | 1.507 |
| 01/11/20 | Won | Mount Si 54 | Inglemoor 44 | League | 7.665 |
| 01/17/20 | Won | Mount Si 36 | Eastlake 30 | League | 6.418 |
| 01/25/20 | Lost | Mount Si 54 | Bothell 67 | League | 12.826 |
| 01/29/20 | Lost | Mount Si 53 | Newport (Bellevue) 55 | League | 4.281 |
42 Wins, 31 Losses
| Date | Game Type | Upset Magnitude | |||
|---|---|---|---|---|---|
| 12/06/02 | Lost | Mount Si 59 | Tahoma 62 | Non-league | 1.034 |
| 12/10/02 | Lost | Mount Si 64 | Lake Washington 68 | Non-league | 4.399 |
| 01/14/03 | Won | Mount Si 76 | Skyline 68 | League | 8.291 |
| 01/17/03 | Won | Mount Si 63 | Bellevue 50 | League | 2.268 |
| 01/31/03 | Lost | Mount Si 62 | Liberty (Issaquah) 65 | League | 19.939 |
| 12/08/03 | Won | Mount Si 67 | Tahoma 59 | Non-league | 0.850 |
| 12/30/03 | Won | Mount Si 49 | King's 46 | Non-league | 1.056 |
| 01/09/04 | Lost | Mount Si 83 | Issaquah 86 | League | 3.020 |
| 01/16/04 | Won | Mount Si 69 | Bellevue 64 | League | 5.799 |
| 02/12/04 | Won | Mount Si 52 | Skyline 44 | Playoff | 3.110 |
| 02/14/04 | Won | Mount Si 61 | Interlake 57 | Playoff | 8.368 |
| 12/03/04 | Won | Mount Si 60 | West Valley (Yakima) 58 | Non-league | 8.456 |
| 12/11/04 | Won | Mount Si 60 | Seattle Christian 47 | Non-league | 3.982 |
| 12/13/04 | Won | Mount Si 61 | Sammamish 55 | League | 5.431 |
| 01/07/05 | Lost | Mount Si 45 | Bellevue 52 | League | 1.528 |
| 02/04/05 | Lost | Mount Si 54 | Newport (Bellevue) 60 | League | 0.507 |
| 02/07/05 | Lost | Mount Si 53 | Bellevue 61 | Playoff | 1.528 |
| 12/02/05 | Won | Mount Si 65 | Redmond 54 | Non-league | 0.542 |
| 12/13/05 | Won | Mount Si 55 | Sammamish 48 | League | 0.719 |
| 01/10/06 | Lost | Mount Si 47 | Newport (Bellevue) 49 | League | 7.053 |
| 01/20/06 | Won | Mount Si 55 | Sammamish 54 | League | 0.719 |
| 01/27/06 | Lost | Mount Si 44 | Mercer Island 51 | League | 3.922 |
| 01/31/06 | Lost | Mount Si 48 | Bellevue 52 | League | 8.205 |
| 02/10/06 | Won | Mount Si 69 | Sammamish 58 | Playoff | 0.719 |
| 02/23/06 | Won | Mount Si 51 | Sammamish 49 | Playoff | 0.719 |
| 03/01/06 | Won | Mount Si 43 | West Valley (Spokane) 41 | Playoff | 11.037 |
| 03/02/06 | Won | Mount Si 49 | Franklin Pierce 46 | Playoff | 1.013 |
| 12/01/06 | Won | Mount Si 65 | Skyline 54 | League | 0.370 |
| 01/22/07 | Won | Mount Si 57 | Newport (Bellevue) 56 | League | 12.568 |
| 02/06/07 | Lost | Mount Si 52 | Sammamish 59 | League | 4.295 |
| 02/12/07 | Won | Mount Si 46 | Liberty (Issaquah) 41 | League | 2.632 |
| 12/27/07 | Won | Mount Si 59 | Monroe 51 | Non-league | 7.733 |
| 01/29/08 | Won | Mount Si 76 | Newport (Bellevue) 71 | League | 2.474 |
| 01/20/09 | Lost | Mount Si 62 | Mercer Island 66 | League | 5.157 |
| 12/05/09 | Lost | Mount Si 61 | Lake Washington 63 | Non-league | 3.083 |
| 12/12/09 | Won | Mount Si 56 | Burlington-Edison 53 | Non-league | 7.455 |
| 01/05/10 | Lost | Mount Si 63 | O'Dea 65 | Non-league | 3.966 |
| 02/09/10 | Won | Mount Si 63 | Bellevue 50 | League | 5.455 |
| 02/11/10 | Lost | Mount Si 53 | Mercer Island 67 | League | 7.346 |
| 02/25/10 | Lost | Mount Si 55 | Franklin 66 | Playoff | 0.675 |
| 03/02/10 | Lost | Mount Si 65 | O'Dea 72 | Playoff | 3.966 |
| 12/10/10 | Won | Mount Si 65 | Lake Washington 55 | League | 5.131 |
| 12/14/10 | Lost | Mount Si 35 | Juanita 36 | League | 16.504 |
| 01/07/11 | Won | Mount Si 53 | Sammamish 46 | League | 6.612 |
| 01/21/11 | Won | Mount Si 58 | Lake Washington 55 | League | 5.131 |
| 12/13/11 | Won | Mount Si 46 | Juanita 44 | League | 0.592 |
| 01/10/12 | Won | Mount Si 59 | Liberty (Issaquah) 48 | League | 1.081 |
| 01/11/13 | Lost | Mount Si 47 | Lake Washington 55 | League | 8.171 |
| 01/12/13 | Won | Mount Si 62 | Bellevue 58 | League | 8.281 |
| 01/15/13 | Won | Mount Si 45 | Bellevue 44 | League | 8.281 |
| 12/03/13 | Won | Mount Si 70 | Gig Harbor 62 | Non-league | 5.475 |
| 01/25/14 | Lost | Mount Si 51 | Liberty (Issaquah) 57 | League | 5.637 |
| 12/02/14 | Lost | Mount Si 42 | Cedarcrest 60 | Non-league | 3.076 |
| 12/09/14 | Won | Mount Si 62 | Redmond 51 | League | 4.198 |
| 01/06/15 | Won | Mount Si 70 | Woodinville 61 | League | 18.060 |
| 12/04/15 | Lost | Mount Si 58 | Eastlake 70 | League | 4.809 |
| 01/08/16 | Won | Mount Si 71 | Newport (Bellevue) 54 | League | 4.230 |
| 01/22/16 | Won | Mount Si 82 | Inglemoor 66 | League | 0.082 |
| 02/02/16 | Won | Mount Si 78 | Skyline 72 | League | 3.112 |
| 12/13/16 | Lost | Mount Si 61 | Eastlake 76 | League | 0.439 |
| 01/06/17 | Won | Mount Si 48 | Inglemoor 41 | League | 2.480 |
| 01/17/17 | Lost | Mount Si 72 | Eastlake 78 | League | 0.439 |
| 01/27/17 | Won | Mount Si 54 | Inglemoor 50 | League | 2.480 |
| 01/31/17 | Won | Mount Si 56 | Skyline 53 | League | 5.133 |
| 02/04/17 | Won | Mount Si 62 | Woodinville 54 | League | 3.052 |
| 12/15/17 | Lost | Mount Si 53 | Eastlake 67 | League | 3.276 |
| 01/03/18 | Lost | Mount Si 67 | Skyline 69 | League | 0.814 |
| 01/05/18 | Lost | Mount Si 64 | Issaquah 68 | League | 6.559 |
| 01/30/18 | Lost | Mount Si 49 | Skyline 57 | League | 0.814 |
| 02/17/18 | Lost | Mount Si 53 | Skyline 54 | Playoff | 0.814 |
| 11/30/18 | Lost | Mount Si 60 | Ferris 68 | Non-league | 4.063 |
| 02/23/19 | Won | Mount Si 60 | Richland 54 | Playoff | 12.381 |
| 02/15/20 | Lost | Mount Si 61 | Woodinville 64 | Playoff | 21.012 |