The San Bernardino Pioneers were formerly the Anaheim Valencias before moving to San Bernardino midway through the 1948 season. Frank Demaree was the only member of the Pioneers to play Major League Baseball.
| Year | Record | Finish | Manager | Playoffs |
|---|---|---|---|---|
| 1949 | 62-64 | 3rd | Jack Rothrock | none |
| 1950 | 65-80 | 6th | Frank Demaree / Gerald Waitman |
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