The Pasadena Silk Sox were founding members of the 1910 Class D level Southern California Trolley League.
Pasadena and the Southern California Trolley League teams officially began play on April 3, 1910.
[7] The Pasadena Silk Sox and other Southern California Trolley League members struggled financially.
[7] On May 3, 1910, the and Pasadena Silk Sox, with a record of 0–4 and the Los Angeles Maiers (1–3) franchises both folded simultaneously.
[14][15] The Pasadena Millionaires and the Southern California League officially began play on April 22, 1913, under a split–season schedule format.
On July 23, 1913, the Southern California League permanently disbanded with the Santa Barbara Barbareans in 1st place in the second half standings.
Today, the main ballpark in Brookside Park is called Jackie Robinson Memorial Field.