| 2021 |
| Fri., Nov. 5 | @ Highlands | W 31-19 | 1st Round Playoffs | | Fri., Nov. 12 | @ Belle Vernon | L 20-45 | 2nd Round Playoffs |
| 2019 |
| Fri., Nov. 1 | @ Belle Vernon | L 6-49 | 1st Round Playoffs |
| 2018 |
| Fri., Nov. 2 | @ Thomas Jefferson | L 16-49 | 1st Round Playoffs |
| 2017 |
| | vs. Montour | L 31-35 | 1st Round Playoffs |
| 2016 |
| | @ South Fayette | W 51-43 | 1st Round Playoffs | | | vs. Ringgold | W 37-18 | 2nd Round Playoffs | | | vs. Thomas Jefferson | L 0-42 | 3rd Round Playoffs |
| 2015 |
| | vs. Mars | L 14-17 | 1st Round Playoffs |
| 2014 |
| | @ Hampton | L 14-33 | 1st Round Playoffs |
| 2009 |
| | Greensburg-Salem | W 45-38 | 1st Round Playoffs | | | West Allegheny | L 7-31 | 2nd Round Playoffs |
| 2008 |
| | Franklin Area | W 53-20 | 1st Round Playoffs | | | Indiana | W 55-49 | 2nd Round Playoffs | | | Thomas Jefferson | L 20-47 | 3rd Round Playoffs |
| 2007 |
| | Knoch | L 24-42 | 1st Round Playoffs |
| 2002 |
| | West Miflin | W 42-14 | 1st Round Playoffs | | | Moon | L 16-21 | 2nd Round Playoffs |
| 2001 |
| | Hampton | L 0-17 | 1st Round Playoffs |
| 1999 |
| | Bethel Park | L 18-25 | 1st Round Playoffs |
| 1998 |
| | North Allegheny | W 14-7 | 1st Round Playoffs | | | Erie Cathedral | W 27-25 | 1st Round Playoffs | | | Woodland Hills | W 17-12 | 2nd Round Playoffs | | | Greensburg-Salem | W 17-14 | 3rd Round Playoffs | | | Upper Saint | W 23-10 | Semi-finals Playoffs | | | Central Bucks | L 7-56 | Championship Game |
| 1987 |
| | Derry Area | W 20-0 | 1st Round Playoffs | | | Ringgold | W 25-21 | 2nd Round Playoffs | | | Aliquippa | L 14-26 | 3rd Round Playoffs |
| 1984 |
| | Connellsville | W 17-0 | 1st Round Playoffs | | | Gateway | L 0-12 | 2nd Round Playoffs |
| 1983 |
| | Fox Chapel | W 26-7 | 1st Round Playoffs | | | Highlands | W 28-0 | 2nd Round Playoffs | | | Plum | L 6-10 | 3rd Round Playoffs |
| 1982 |
| | Upper Saint | W 14-9 | 1st Round Playoffs | | | Highlands | W 27-19 | 2nd Round Playoffs | | | Ringgold | L 3-6 | 3rd Round Playoffs |
| 1981 |
| | Mount Lebanon | L 3-30 | 1st Round Playoffs |
| 1977 |
| | Plum | W 12-7 | 1st Round Playoffs | | | Penn Hills | L 2-14 | 2nd Round Playoffs |
| 1975 |
| | North Allegheny | W 14-8 | 1st Round Playoffs | | | Monessen | W 40-18 | 2nd Round Playoffs | | | Upper Saint | T 0-0 | Semi-finals Playoffs |
| 1974 |
| | Derry Area | W 29-7 | 1st Round Playoffs | | | Gateway | L 12-20 | 2nd Round Playoffs |
| 1973 |
| | Mount Lebanon | W 3-0 | Semi-finals Playoffs | | | Gateway | W 21-15 | Championship Game |
| 1967 |
| | Mount Lebanon | W 20-14 | Championship Game |
| 1949 |
| | McKeesport | W 8-7 | Championship Game |
| 1948 |
| | Monongahela | W 43-14 | Championship Game |
| 1942 |
| | Aliquippa | W 25-0 | Championship Game |
| 1932 |
| | McKeesport | W 20-0 | Championship Game |
| 1924 |
| | Charleroi | W 10-6 | Championship Game |
| 1923 |
| | Turtle Creek | T 14-14 | Championship Game |
|
| New Castle Playoff Totals |
| Record |
31-21-2 1061-1062 |
| Home Record | 1-3 |
| Away Record | 2-4 |
|
