| Past champions | |||
| Year | Winner | Score | Course |
| 1999 | Juli Inkster | 207 (9-under) | Columbia Edgewater CC, Portland, Ore. |
| 1998 | Danielle Ammaccapane | 204 (12-under) | Columbia Edgewater CC, Portland, Ore. |
| 1997 | Chris Johnson | 206 (10-under) | Columbia Edgewater CC, Portland, Ore. |
| 1996 | Dottie Pepper | 202 (14-under) | Columbia Edgewater CC, Portland, Ore. |
| 1995 | Alison Nicholas | 207 (9-under) | Columbia Edgewater CC, Portland, Ore. |
| 1994 | Missie McGeorge | 207 (9-under) | Columbia Edgewater CC, Portland, Ore. |
| 1993 | Donna Andrews | 208 (8-under) | Columbia Edgewater CC, Portland, Ore. |
| 1992 | x-Nancy Lopez | 209 (7-under) | Columbia Edgewater CC, Portland, Ore. |
| 1991 | Michelle Estill | 208 (8-under) | Columbia Edgewater CC, Portland, Ore. |
| 1990 | Patty Sheehan | 208 (8-under) | Columbia Edgewater CC, Portland, Ore. |
| 1989 | Muffin Spencer-Devlin | 214 (2-under) | Riverside G&CC, Portland, Ore. |
| 1988 | Betsy King | 213 (3-under) | Riverside G&CC, Portland, Ore. |
| 1987 | Nancy Lopez | 210 (6-under) | Columbia Edgewater CC, Portland, Ore. |
| 1986 | Ayako Okamoto | 207 (9-under) | Columbia Edgewater CC, Portland, Ore. |
| 1985 | Nancy Lopez | 215 (1-under) | Riverside G&CC, Portland, Ore. |
| 1984 | Amy Alcott | 212 (4-under) | Riverside G&CC, Portland, Ore. |
| 1983 | x-JoAnne Carner | 212 (4-under) | Columbia Edgewater CC, Portland, Ore. |
| 1982 |
x-Sandra Haynie Kathy McMullen |
196 (20-under) | Columbia Edgewater CC, Portland, Ore. |
| 1981 |
x-Donna Caponi Kathy Whitworth |
203 (16-under) | Riverside G&CC, Portland, Ore. |
| 1980 |
x-Donna Caponi Kathy Whitworth |
195 (24-under) | Riverside G&CC, Portland, Ore. |
| 1979 |
Nancy Lopez Jo Ann Washam |
198 (21-under) | Portland CC, Portland, Ore. |
| 1978 |
x-Donna Caponi Kathy Whitworth |
203 (16-under) | Columbia Edgewater CC, Portland, Ore. |
| 1977 |
x-JoAnne Carner Judy Rankin |
202 (17-under) | Columbia Edgewater CC, Portland, Ore. |
| 1976 | x-Donna Caponi | 217 (2-under) | Portland CC, Portland, Ore. |
| 1975 | Jo Ann Washam | 215 (1-under) | Columbia Edgewater CC, Portland, Ore. |
| 1974 | JoAnne Carner | 211 (5-under) | Columbia Edgewater CC, Portland, Ore. |
| 1973 | y-Kathy Whitworth | 144 (2-under) | Portland CC, Portland, Ore. |
| 1972 | Kathy Whitworth | 212 (7-under) | Portland CC, Portland, Ore. |
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