H - Denotes home games & (H) denotes homecoming.
1980 AA
| W | L | T |
| 7 | 3 | 0 |
(0 - 1) Playoffs
Coach: Roy Abshire
| Prosser | 0 | Eastmont | 24 | |
| Prosser | 27 | West Valley | 0 | |
| Prosser | 7 | Hanford | 3 | |
| Prosser | 28 | Grandview | 6 | |
| Prosser | 13 | Ellensburg | 12 | |
| Prosser | 15 | Selah | 10 | |
| Prosser | 28 | Toppenish | 15 | |
| Prosser | 12 | Othello | 30 | |
| Prosser | 14 | Sunnyside * | 9 |
First Round
| Prosser | 0 | Olympia | 20 | |
| Total | 144 | 129 |
* The victory over Sunnyside marks the first victory for the Mustangs over the Grizzlies since 1968.
1981 AA
| W | L | T |
| 7 | 2 | 0 |
Coach: Roy Abshire
| Prosser | 19 | Wapato | 18 | |
| Prosser | 20 | East Valley | 0 | |
| Prosser | 16 | West Valley | 7 | |
| Prosser | 12 | Eastmont | 0 | |
| Prosser | 18 | Grandview | 0 | |
| Prosser | 21 | Othello | 6 | |
| Prosser | 7 | Sunnyside | 21 | |
| Prosser | 13 | Toppenish | 7 | |
| Prosser | 27 | Hanford | 35 |
Mini-Playoff
| Prosser | 0 | Eastmont | 14 | |
| Total | 163 | 94 |
1982 AA
| W | L | T |
| 6 | 3 | 0 |
Coach: Roy Abshire
| Prosser | 12 | Wapato | 7 | |
| Prosser | 13 | East Valley * | 24 | |
| Prosser | 27 | West Valley | 10 | |
| Prosser | 17 | Eastmont | 8 | |
| Prosser | 10 | Grandview | 6 | |
| Prosser | 6 | Othello | 7 | |
| Prosser | 13 | Sunnyside | 7 | |
| Prosser | 26 | Toppenish ** | 23 OT | |
| Prosser | 6 | Hanford | 37 | |
| Total | 130 | 129 |
* The loss to East Valley ended the Red Devils 42 game losing streak.
** Came back from a 20 - 0 deficit with 4 minutes left on the game to win in overtime.
1983 AA
| W | L | T |
| 0 | 9 | 0 |
Coach: Roy Abshire
| Prosser | 12 | Eastmont | 16 | |
| Prosser | 6 | Selah | 26 | |
| Prosser | 0 | East Side Catholic | 34 | |
| Prosser | 0 | Othello | 20 | |
| Prosser | 13 | West Valley | 18 | |
| Prosser | 0 | Grandview | 14 | |
| Prosser | 0 | Toppenish | 30 | |
| Prosser | 6 | Wapato | 19 | |
| Prosser | 14 | Sunnyside | 25 | |
| Total | 51 | 202 |
1984
| W | L | T |
| 5 | 4 | 0 |
Coach: Roy Abshire
| Prosser | 14 | Eastmont | 7 | |
| Prosser | 21 | Selah | 26 | |
| Prosser | 0 | Riverside | 28 | |
| Prosser | 7 | Othello | 0 | |
| Prosser | 0 | West Valley | 30 | |
| Prosser | 15 | Grandview | 19 | |
| Prosser | 7 | Toppenish | 6 | |
| Prosser | 26 | Wapato | 0 | |
| Prosser | 7 | Sunnyside | 6 |
Mini-Playoff
| Prosser | 7 | Othello * | 14 | |
| Total | 97 | 122 |
* Jarrod Boyle raced in to block the punt, but the punter pulled the ball back down and ran 90 yards for the winning touchdown.
1985 AA
| W | L | T |
| 3 | 5 | 0 |
Coach: Roy Abshire
| Prosser | 0 | Selah | 14 | |
| Prosser | 34 | Ellensburg | 0 | |
| Prosser | 21 | Sunnyside | 0 | |
| Prosser | 10 | Grandview | 18 OT | |
| Prosser | 8 | Eastmont | 24 | |
| Prosser | 12 | Hanford | 24 | |
| Prosser | 40 | Toppenish | 6 | |
| Prosser | 0 | Othello | 17 | |
| Total | 125 | 103 |
1986 AA
| W | L | T |
| 4 | 5 | 0 |
Coach: Tom Moore
| Prosser | 20 | West Valley | 29 | |
| Prosser | 6 | Selah | 9 | |
| Prosser | 14 | Ellensburg | 7 | |
| Prosser | 14 | Sunnyside | 11 | |
| Prosser | 27 | Grandview | 12 | |
| Prosser | 11 | Eastmont | 21 | |
| Prosser | 11 | Hanford | 17 | |
| Prosser | 24 | Toppenish | 21 | |
| Prosser | 21 | Othello | 28 | |
| Total | 138 | 155 |
1987 A
League Champions
| W | L | T |
| 7 | 4 | 0 |
(1 - 1) Playoffs
Coach: Tom Moore
| Prosser | 13 | West Valley | 28 | |
| Prosser | 19 | Toppenish | 7 | |
| Prosser | 7 | Grandview | 15 | |
| Prosser | 6 | Medical Lake | 7 | |
| Prosser | 20 | Royal City | 13 | |
| Prosser | 27 | Riverview | 7 | |
| Prosser | 14 | Ki-Be | 7 | |
| Prosser | 28 | Burbank | 7 | |
| Prosser | 32 | Connell | 20 |
First Round
| Prosser | 29 | Medical Lake | 15 |
Quarter-Finals
| Prosser | 28 | Ephrata ** | 34 OT | |
| Total | 223 | 160 |
* Steve Harris ran 39 times for 220 yards in win over Riverview.
** Ephrata eventually went on to win the State Championship.
1988 A
League Champions
| W | L | T |
| 7 | 3 | 0 |
(0 - 1) Playoffs
Coach: Tom Moore
| Prosser | 12 | West Valley | 30 | |
| Prosser | 14 | Toppenish | 21 | |
| Prosser | 28 | Grandview | 6 | |
| Prosser | 12 | Medical Lake | 6 | |
| Prosser | 28 | Royal City | 6 | |
| Prosser | 36 | Riverview | 21 | |
| Prosser | 46 | Ki-Be * | 7 | |
| Prosser (H) | 28 | Burbank | 7 | |
| Prosser | 28 | Connell | 9 |
First Round
| Prosser | 21 | Chewelah ** | 28 2OT | |
| Total | 253 | 134 |
* Steve Harris and Wayne Dubois combined for 269 yards rushing and 4 touchdowns in rout of Ki-Be on their Homecoming.
** Prosser fumbled away its playoff hopes as the Mustangs gave the ball up 7 times including one in the second overtime that led to the winning score.
1989 AA
League Champions *
W L T 9 1 0 (0 - 1) Playoffs
Coach: Tom Moore
State Rank Prosser 47 Grandview 6 Prosser 21 Othello 6 Prosser 23 Selah 8 (8) Prosser 15 Sunnyside 12 (6) Prosser 31 Eastmont ** 21 (4) Prosser (H) 32 Ellensburg 13 (2) Prosser 42 West Valley 14 (2) Prosser 28 Hanford *** 21 (2) Prosser 21 Othello 6 First Round
Prosser 18 Clarkston **** 19 Totals 278 126 * Steve Harris was named running back of the league after rushing for 1105 yards.
** Steve Harris rushed 35 times for 231 yards and 3 touchdowns against Eastmont
*** Scott Morgan filling in for an injured Steve Harris rushed for a school record 324 yards (202 yards in the 2nd half) against Hanford.
**** Clarkston scored 19 points in the 4th quarter to come back from an 18 to 0 deficit to win.
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